start-ver=1.4
cd-journal=joma
no-vol=42
cd-vols=
no-issue=
article-no=
start-page=i
end-page=i
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2020
dt-pub=20200401
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=序
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=齊藤邦行
kn-aut-sei=齊藤
kn-aut-mei=邦行
aut-affil-num=1
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学農学部附属山陽圏フィールド科学センター
END

start-ver=1.4
cd-journal=joma
no-vol=113
cd-vols=
no-issue=
article-no=
start-page=33
end-page=39
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2024
dt-pub=20240201
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=Comparisons of nitrogen use efficiency between rice cv. Nipponbare and Takanari at different fertilization levels
kn-title=異なる施肥条件下における水稲品種の窒素利用効率 ―日本晴とタカナリの比較―
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The rice cultivar Nipponbare and the high-yielding cultivar Takanari were cultivated in field trials for three years from 2003, and in pot trials (1/2,000a) for two years from 2004. In the field trials, the following three levels of fertilizer were applied：“0N” without fertilizer, “1N” with the standard amount(8kgN 10a–1), and “2N” with twice the standard amount (16kgN 10a–1). In the pot trial, three levels of fertilizer were applied：“0N” without fertilizer, “1.5N” with 1.5times the standard amount (1.5gN pot–1), and “3N” with three times the standard amount (3gN pot–1). In the field trials, yields were higher in Takanari (538 to 843g m–2) than in Nihonbare (423 to 577g m–2), and the increase in yield with fertilizer application was also larger in Takanari. This was related to the larger sink capacity of Takanari and the smaller decrease in the percentage of filled grain with larger sink capacity. The dry matter weight and nitrogen uptake at the panicle initiation stage were higher in the plots with higher fertilizer application, but the differences between the cultivars were small. Dry matter weight and nitrogen uptake at harvest time were higher in Takanari, and nitrogen use efficiency and sink production efficiency were also higher in Takanari, but the differences in nitrogen use efficiency between cultivars became smaller with increasing fertilizer application. The nitrogen use efficiency for dry matter production also decreased with increasing fertilizer application, and was higher in 2005 in Takanari. The leaf photosynthetic rate of Takanari was higher than that of Nipponbare in the pot experiment. The difference in leaf photosynthetic rate was related to the nitrogen use efficiency (photosynthetic rate / leaf nitrogen content), and the difference in leaf nitrogen content between cultivars was small. The nitrogen use efficiency for dry matter was highest in the “0N” and decreased with increasing fertilizer application, and was higher in Takanari than in Nipponbare. This was presumably related to the higher nitrogen use efficiency of photosynthesis. It was found that fertilizer application decreased nitrogen use efficiency and sink production efficiency, but yield increased with increasing sink capacity, and that differences in nitrogen use efficiency among cultivars were related to the amount of nitrogen absorbed up to the panicle initiation stage and sink production efficiency. In order to improve the efficiency of fertilizer application, it is desirable to increase nitrogen absorption, which is expressed as multiplying the number of days to panicle initiation and the rate of nitrogen absorption, and to select cultivars with higher sink production efficiency.
en-copyright=
kn-copyright=

en-aut-name=SaitohKuniyuki
en-aut-sei=Saitoh
en-aut-mei=Kuniyuki
kn-aut-name=齊藤邦行
kn-aut-sei=齊藤
kn-aut-mei=邦行
aut-affil-num=1
ORCID=

en-aut-name=DannoYusuke
en-aut-sei=Danno
en-aut-mei=Yusuke
kn-aut-name=檀野祐亮
kn-aut-sei=檀野
kn-aut-mei=祐亮
aut-affil-num=2
ORCID=

affil-num=1
en-affil=The Graduate School of Environmental, Life, Natural Science and Technology, Okayama University
kn-affil=岡山大学大学院環境生命自然科学研究科

affil-num=2
en-affil=The Graduate School of Natural Science and Technology, Okayama University
kn-affil=岡山大学大学院自然科学研究科
en-keyword=High-yielding rice cultivar
kn-keyword=High-yielding rice cultivar
en-keyword=Nitrogen use efficiency
kn-keyword=Nitrogen use efficiency
en-keyword=Nitrogen uptake
kn-keyword=Nitrogen uptake
en-keyword=Sink capacity
kn-keyword=Sink capacity
en-keyword=Sink production efficiency
kn-keyword=Sink production efficiency
END

start-ver=1.4
cd-journal=joma
no-vol=113
cd-vols=
no-issue=
article-no=
start-page=25
end-page=32
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2024
dt-pub=20240201
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=アメリカ産ダイズ品種‘UA4805’ の多収性に関する解析的研究－日本品種 ‘あきまろ’ との比較－
kn-title=Analytical studies on high-yielding characteristics of US soybean cv. ‘UA4805’ in comparison with Japanese cv. ‘Akimaro’
en-subtitle=
kn-subtitle=
en-abstract=2020年と2021年に岡山大学農学部附属山陽圏フィールド科学センター（34°41ʼN, 133°55ʼE）でダイズの栽培試験を行った．アメリカ品種‘UA4805’ と日本品種‘あきまろ’ の2 品種を供試し，栽植密度を12.5 株 m-2（疎植，80 × 10 cm）と25 株m-2（密植，80 × 5 cm）の2 段階として，2020年5 月25日（早期）， 6 月29日（普通期）， 8 月3 日（晩期）に播種した．2021年は畦幅80 cm（広畦）と30 cm（狭畦），栽植密度12.5株m-2と25株m-2の2 段階で栽培した．子実収量は，2020年と2021年ともに‘あきまろ’ よりも‘UA4805’ の方が高かった．播種時期が遅いほど，粒/茎比が高くなった．両品種ともに疎植区に比べ密植区で乾物重が大きくなった．‘あきまろ’ は‘UA4805’ よりも乾物重は大きかったが，子実収量は低かった．一方，ʻUA4805ʼ は乾物重が小さかったが，節数，莢数，子実数が多く，子実収量が高かった．‘あきまろ’ は特に密植区において，倒伏程度が大きかった．粒/茎比は，いずれの試験区においてもʻ あきまろ’に比べ‘UA4805’ が著しく高かった．結莢率は‘UA4805’ が‘あきまろ’ より2 倍近く高かった．‘UA4805’ の子実収量が‘あきまろ’ に比べて高かったのは，結莢率，粒/茎比が高く，倒伏程度が小さかったことによるが，乾物生産は‘あきまろ’ の方が大きかった．晩期栽培の場合，子実収量を向上させるためには栽植密度を高くすることが推奨された．ダイズの子実収量を向上させるには，狭畦栽培が効果的であった．
kn-abstract=Field experiments were conducted in 2020 and 2021 at the Field Science Center of Okayama Univ. (34°41’ N, 133°55’ E). Two Soybean cultivars ‘UA4805’ and ‘Akimaro’ were sown with two planting densities, 12.5plants m−2 (sparse, 80×10cm) and 25plants m−2 (dense, 80×5cm)on May 25 (early), June 29 (normal), and Aug. 3 (late) in 2020, and 80 and 30cm row-width, and 12.5 and 25 plant m−2 in 2021 on June 23. Seed yield was higher in ‘UA4805’ than in ‘Akimaro’ in 2020 and 2021. The later the sowing time, the higher the seeds/stem ratio. Both cultivars showed higher dry matter in dense planting. Dry matter was higher in ‘Akimaro’, while seed yield was lower than ‘UA4805’. In contrast, ‘UA4805’ showed lower dry matter with higher seed yield. The numbers of nodes, pods, and seeds were higher in ‘UA4805’ resulting in the higher seed yield. Lodging score is larger in ‘Akimaro’ especially in dense planting. The seeds/stem ratio is much higher in ‘UA4805’ than ‘Akimaro’ across 2 densities, 3 sowing times and 2 row width. Pods setting ratio was nearly two times higher in ‘UA4805’ compared to ‘Akimaro’. The greater seed yield of ‘UA4805’ compared to ‘Akimaro’ was due to the higher pod setting ratio, seeds/stem ratio, and lower lodging score, nevertheless the dry matter was larger in ‘Akimaro’. If late sowing is applied, higher planting density is recommended for better seed yield. Narrow row is an effective way to improve seed yield in soybean.
en-copyright=
kn-copyright=

en-aut-name=MaroufSultanzada Mohammad
en-aut-sei=Marouf
en-aut-mei=Sultanzada Mohammad
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=HasegawaYu
en-aut-sei=Hasegawa
en-aut-mei=Yu
kn-aut-name=長谷川湧
kn-aut-sei=長谷川
kn-aut-mei=湧
aut-affil-num=2
ORCID=

en-aut-name=ManabeRyuta
en-aut-sei=Manabe
en-aut-mei=Ryuta
kn-aut-name=眞鍋竜太
kn-aut-sei=眞鍋
kn-aut-mei=竜太
aut-affil-num=3
ORCID=

en-aut-name=SaitohKuniyuki
en-aut-sei=Saitoh
en-aut-mei=Kuniyuki
kn-aut-name=齊藤邦行
kn-aut-sei=齊藤
kn-aut-mei=邦行
aut-affil-num=4
ORCID=

affil-num=1
en-affil=Graduate School of Environmental and Life Science
kn-affil=岡山大学大学院環境生命科学研究科

affil-num=2
en-affil=School of Agriculture
kn-affil=岡山大学農学部

affil-num=3
en-affil=School of Agriculture
kn-affil=岡山大学農学部

affil-num=4
en-affil=Graduate School of Environmental and Life Science
kn-affil=岡山大学大学院環境生命科学研究科
en-keyword=Narrow row
kn-keyword=Narrow row
en-keyword=Planting density
kn-keyword=Planting density
en-keyword=Podding rate
kn-keyword=Podding rate
en-keyword=Seeds/stem ratio
kn-keyword=Seeds/stem ratio
en-keyword=Seed yield
kn-keyword=Seed yield
en-keyword=Sowing time
kn-keyword=Sowing time
en-keyword=Soybean
kn-keyword=Soybean
END

start-ver=1.4
cd-journal=joma
no-vol=113
cd-vols=
no-issue=
article-no=
start-page=17
end-page=24
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2024
dt-pub=20240201
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=Cultivar differences in nitrogen use efficiency of rice
kn-title=水稲における窒素利用効率の品種間差異
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=We investigated the effects of fertilizer-free and fertilizer-applied cultivation on growth, yield and nitrogen (N) utilization of rice cultivars in our Kurashiki paddy fields (Institute of Plant Science and Resources, Okayama Univ.), which have been cultivated without fertilizer since 1970, and also in our Okayama paddy fields, which are conventionally cultivated. In 2001, the cultivars Nipponbare (NIP) and Nourin 18 (N18) were cultivated in the Kurashiki fields, with a “0N plot” (no fertilizer application), a “1N plot” (standard fertilizer application), and a “2N plot” (double fertilizer application). In 2002, five cultivars were grown without fertilizer in the Kurashiki fields, and 51cultivars were tested in 0N and 1N plots in the Okayama fields. Yield (2001) in the Kurashiki fields was higher in the 0N plot for N18 (379g m–2), which had a higher number of spikelets per m2, than NIP (300 g m–2), while in the 1N and 2N plots it was higher for NIP, which had a higher percentage of ripening, and N18 had high yield potential even without fertilizer application, but low fertilizer tolerance. The differences in yield were related to N-uptake (NU), and the differences in N use efficiency (NUE, yield/NU) between cultivars were small. The pot experiment showed that the yield of 0N plot was higher for N18 than NIP grown in Kurashiki soil because of the higher number of spikelets per hill, and the yield in the Okayama soil was higher than that in the Kurashiki soil. Long-term non-fertilized soils are of poor soil fertility, which also decreases the NUE, and the NUE of N18 is higher than that of NIP under isolated conditions. The difference in yields is closely related to sink capacity (SC). In 2002, yields in the Kurashiki fields were highest in Takanari (TAK, 494g m–2) and lowest in NIP (350g m–2), and differences in yields were closely related to SC. NUE was highest in TAK (68.6) and lowest in Akebono (48.1). TAK had high NUE and high sink production efficiency (SPE, SC/NU), while N18 had low NUE but high SC due to higher NU, ensuring high yield even under unfertilized cultivation. Yields in the 0N and 1N plots cultivated in 2002 varied between 244–631g m–2 and 199–769g m–2, respectively. A close positive correlation was observed between yield and SC, and between NU and SC, suggesting that the SC through NU is involved in determining yield. A positive correlation was also observed between NUE and yield. It was found that yield increased with an increase in NUE, and that NUE decreased although yield increased with fertilizer application. Through selection of cultivars with high SPE, it is expected that it will be possible to breed low-input, high-yielding cultivars with high NUE in the future.
en-copyright=
kn-copyright=

en-aut-name=SaitohKuniyuki
en-aut-sei=Saitoh
en-aut-mei=Kuniyuki
kn-aut-name=齊藤邦行
kn-aut-sei=齊藤
kn-aut-mei=邦行
aut-affil-num=1
ORCID=

en-aut-name=IwameYoshifumi
en-aut-sei=Iwame
en-aut-mei=Yoshifumi
kn-aut-name=岩目好史
kn-aut-sei=岩目
kn-aut-mei=好史
aut-affil-num=2
ORCID=

en-aut-name=MaekawaMasahiko
en-aut-sei=Maekawa
en-aut-mei=Masahiko
kn-aut-name=前川雅彦
kn-aut-sei=前川
kn-aut-mei=雅彦
aut-affil-num=3
ORCID=

en-aut-name=TakedaKazuyoshi
en-aut-sei=Takeda
en-aut-mei=Kazuyoshi
kn-aut-name=武田和義
kn-aut-sei=武田
kn-aut-mei=和義
aut-affil-num=4
ORCID=

affil-num=1
en-affil=The Graduate School of Environmental, Life, Natural Science and Technology, Okayama University
kn-affil=岡山大学大学院環境生命自然科学研究科

affil-num=2
en-affil=The Graduate School of Natural Science and Technology, Okayama University
kn-affil=岡山大学大学院自然科学研究科

affil-num=3
en-affil=Institute of Plant Science and Resources （IPSR）, Okayama University
kn-affil=岡山大学資源植物科学研究所

affil-num=4
en-affil=Institute of Plant Science and Resources（IPSR）, Okayama University
kn-affil=岡山大学資源植物科学研究所
en-keyword=High-yielding rice cultivar
kn-keyword=High-yielding rice cultivar
en-keyword=Nitrogen use efficiency
kn-keyword=Nitrogen use efficiency
en-keyword=Nitrogen uptake
kn-keyword=Nitrogen uptake
en-keyword=Sink capacity
kn-keyword=Sink capacity
en-keyword=Sink production efficiency
kn-keyword=Sink production efficiency
en-keyword=Unfertilized paddy field
kn-keyword=Unfertilized paddy field
END

start-ver=1.4
cd-journal=joma
no-vol=109
cd-vols=
no-issue=
article-no=
start-page=13
end-page=20
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2020
dt-pub=20200201
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Effect of System of Rice Intensification（SRI）on growth and yield performance in Nam Dong district, Thua Thien Hue province, Vietnam
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract= The field study was conducted in Nam Dong district, Thua Thien Hue province, Vietnam during May 2019 to observe the effects of SRI method on the rice yield and eradicate the factor affecting the yield. The study was carried out to evaluate the agronomic characteristics of rice, fresh and dry matter production, soil characteristics with a focus group discussion regarding cultivation by SRI and non-SRI methods. The soil analyses using standard measurements showed quite similar soil fertility in both SRI and non-SRI methods, while rice plants showed good agronomic performances and fresh and dry matter production in SRI method. At harvesting time, the yield and yield potentials of rice were greater in SRI than that in non-SRI methods. Focus group discussion found some factors that limited SRI development in Nam Dong district.
en-copyright=
kn-copyright=

en-aut-name=Nguyen Quang Co
en-aut-sei=Nguyen Quang Co
en-aut-mei=
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=Nguyen Thi Thanh Hien
en-aut-sei=Nguyen Thi Thanh Hien
en-aut-mei=
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=SaitohKuniyuki
en-aut-sei=Saitoh
en-aut-mei=Kuniyuki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

affil-num=1
en-affil=University of Agriculture and Forestry, Hue Univer
kn-affil=

affil-num=2
en-affil=Institute of Resources and Environment, Hue University
kn-affil=

affil-num=3
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=
en-keyword=Actual yield
kn-keyword=Actual yield
en-keyword=Focus group discussion
kn-keyword=Focus group discussion
en-keyword=Filled spikelets
kn-keyword=Filled spikelets
en-keyword=SRI
kn-keyword=SRI
en-keyword=Weeding
kn-keyword=Weeding
END

start-ver=1.4
cd-journal=joma
no-vol=106
cd-vols=
no-issue=
article-no=
start-page=13
end-page=20
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2017
dt-pub=20170201
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=圃場栽培したベトナム産水稲品種（Oriza sativa L.）の乾物生産，収量と玄米の外観品質
kn-title=Effect of shading on dry-matter production, yield and grain appearance quality of Vietnamese rice cultivars （Oryza sativa L.） in the paddy field
en-subtitle=
kn-subtitle=
en-abstract=　光強度は，水稲の生育・収量を決定する最も重要な環境要因である．しかし，光強度の減少，すなわち遮光処理がインド型水稲品種，特にベトナム産品種の生育・収量に及ぼす影響に関する知見は限られている．本研究では，登熟期間の遮光がベトナム産水稲品種の乾物生産，収量と収量構成要素，玄米の外観品質に及ぼす影響を2015年に調査した．ベトナム産水稲14品種を圃場栽培を行い，最初に出穂が認められた品種の出穂期以降収穫期まで，群落上層を黒色寒冷紗（遮光率50 ）を用いて被覆する，遮光処理を行った．ベトナム産14品種の収量は，遮光に伴い自然光条件に比較して32.2～65.0 の低下がみられた．遮光処理の影響が大きかった品種は‘Jasmine 85’ と‘OM2395’ で，それぞれ65.0，59.8 の収量低下がみられた．収量の低下には，登熟期の個体群成長速度，収量構成要素では穎花不稔の増加による登熟歩合の低下に起因していた．遮光処理はすべての品種で玄米の未熟粒割合を増加させた．遮光処理により，白未熟粒と青未熟粒の増加がみられ，その程度は白未熟粒が‘OM2517’ で，青未熟粒が‘OM5415’ で最も著しかった．以上の結果，遮光処理はベトナム産水稲14品種の収量と玄米の外観品質を低下させたが，その程度には品種間差があることが明らかになり，これらの傾向は日本産水稲品種で得られた結果と同様であった．
kn-abstract=Light intensity is one of the most important environmental factors to determine the growth and yield of rice. However, little information is known about the response of indica cultivars, especially Vietnamese cultivars to shading conditions. In this study, a field experiment was conducted in 2015 to determine the response of Vietnamese cultivars to shading condition during the grain filling period. Fourteen Vietnamese cultivars were covered by black cloth (50% shading treatment) after the heading stage in the field conditions. Grain yield of fourteen Vietnamese cultivars in shading condition fell to about 32.2–65.0% of the natural light condition. The most sensitive cultivars to shading are ‘Jasmine 85’ and ‘OM2395’, of which the grain yield decreased to 65.0 and 59.8% of natural light condition, respectively. The shaded yield decreased corresponding to the reduction in crop growth rate (CGR) and yield components, especially in the percentage of filled grain due to the increase in spikelet sterility. Shading increased the percentage of immature grains in all cultivars. Shading induced an increase in the percentage of chalky and green grains, which was largest in ‘OM2517’ and ‘OM5451’, respectively. Clearly, shading depressed both grain yield and the appearance quality of brown rice in Vietnamese cultivars, similarly reported in previous studies with Japanese cultivars.
en-copyright=
kn-copyright=

en-aut-name=Tran LocThuya
en-aut-sei=Tran LocThuya
en-aut-mei=
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=SaitohKuniyuki
en-aut-sei=Saitoh
en-aut-mei=Kuniyuki
kn-aut-name=齊藤邦行
kn-aut-sei=齊藤
kn-aut-mei=邦行
aut-affil-num=2
ORCID=

affil-num=1
en-affil=Graduate School of Environmental and life Science, Okayama University
kn-affil=岡山大学大学院環境生命科学研究科

affil-num=2
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=岡山大学大学院環境生命科学研究科
en-keyword=Crop growth rate
kn-keyword=Crop growth rate
en-keyword=Dry matter production
kn-keyword=Dry matter production
en-keyword=Grain appearance quality
kn-keyword=Grain appearance quality
en-keyword=Shading
kn-keyword=Shading
en-keyword=Vietnamese cultivars.
kn-keyword=Vietnamese cultivars.
END

start-ver=1.4
cd-journal=joma
no-vol=38
cd-vols=
no-issue=
article-no=
start-page=9
end-page=16
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2016
dt-pub=20160401
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=鉄コーティング種子を用いた湛水直播栽培における 飼料用水稲品種の適応性
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=出江嘉朗
kn-aut-sei=出江
kn-aut-mei=嘉朗
aut-affil-num=1
ORCID=

en-aut-name=SaitohKuniyuki
en-aut-sei=Saitoh
en-aut-mei=Kuniyuki
kn-aut-name=齊藤邦行
kn-aut-sei=齊藤
kn-aut-mei=邦行
aut-affil-num=2
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学山陽圏フィールド科学センター

affil-num=2
en-affil=
kn-affil=岡山大学山陽圏フィールド科学センター
END

start-ver=1.4
cd-journal=joma
no-vol=37
cd-vols=
no-issue=
article-no=
start-page=i
end-page=i
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2015
dt-pub=20150401
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=序
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=齊藤邦行
kn-aut-sei=齊藤
kn-aut-mei=邦行
aut-affil-num=1
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学農学部附属山陽圏フィールド科学センター
END

start-ver=1.4
cd-journal=joma
no-vol=36
cd-vols=
no-issue=
article-no=
start-page=i
end-page=i
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2014
dt-pub=20140401
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=序
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=齊藤邦行
kn-aut-sei=齊藤
kn-aut-mei=邦行
aut-affil-num=1
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学農学部附属山陽圏フィールド科学センター
END

start-ver=1.4
cd-journal=joma
no-vol=104
cd-vols=
no-issue=
article-no=
start-page=13
end-page=21
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2015
dt-pub=20150201
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=水稲品種の乾物生産，収量と窒素利用効率に及ぼす肥料と施肥法の影響
kn-title=Effects of different types of fertilizers and methods on dry matter production, yield and nitrogen use efficiency of rice cultivars under field conditions
en-subtitle=
kn-subtitle=
en-abstract=　水稲の乾物生産，収量，窒素利用効率に及ぼす肥料と施肥法の影響を試験するため，水稲品種日本晴とタカナリを供試し，対照区（無施肥），慣行施肥区（分割追肥），深層追肥区，標準緩効性肥料基肥施肥区，倍量緩効性肥料基肥施肥区の５試験区を用いて栽培を行った．窒素施肥とともに，乾物生産が増大し，最終乾物重はタカナリでは深層追肥区，日本晴では標準緩効性肥料基肥施肥区で最も高くなった．乾物重の相違には個体群成長速度と葉面積指数が主として影響していた．収穫期の乾物重が大きいほど，窒素蓄積が多くなった．窒素蓄積量は両品種ともに深層追肥区で多くなった．施肥量の増加は穂数と㎡当たり穎花数を増加させた．タカナリの収量が高いことには，シンク容量が大きいことが関係した．両品種ともに慣行施肥区に比べ深層追肥区の収量が高くなったが，これにはシンク容量の拡大が関係していた．深層追肥区，標準緩効性肥料基肥施肥区ともに慣行施肥区に比べ窒素回収効率，部分要因生産性ともに向上したが，省力・低コストの観点からは施肥効率の高い緩効性肥料の利用が推奨された．
kn-abstract=　To examine the effects of different types of fertilizers and application methods on dry matter production, yield, nitrogen accumulation and use efficiency in rice cultivars, we used two rice cultivars (Nipponbare and Takanari) and five fertilizer methods, i.e. Control (0N), Conventional method, Deep fertilizer
method, Standard fertilizer method and High fertilizer method in 2009. Dry matter production
was more markedly increased with nitrogen fertilizer application than in control, and it was higher with deep fertilizer application in Takanari and standard fertilizer application in Nipponbare, respectively. The differences in dry matter production resulted from CGR and mean LAI in rice cultivars. Greater dry matter production was accompanied with the nitrogen accumulation at harvesting. Rice cultivars accumulated the largest amount of nitrogen at deep fertilizer application. Higher fertilizer application increased the number of panicle and total spikelets m–2. The higher grain yield in Takanari
resulted from the larger sink capacity. The grain yield of rice cultivars tended to be higher with deep fertilizer application due to the increase in sink capacity. Both deep fertilizer application and basal application of slow-release fertilizer increased the recovery efficiency and partial factor productivity of applied N, however, using slow-release fertilizer is recommended in terms of labor saving and lower
cost.
en-copyright=
kn-copyright=

en-aut-name=YabeRyo
en-aut-sei=Yabe
en-aut-mei=Ryo
kn-aut-name=矢部亮
kn-aut-sei=矢部
kn-aut-mei=亮
aut-affil-num=1
ORCID=

en-aut-name=Nguyen Quang Co
en-aut-sei=Nguyen Quang Co
en-aut-mei=
kn-aut-name=グエン クアン コ
kn-aut-sei=グエン クアン コ
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=Trinh Thi Sen
en-aut-sei=Trinh Thi Sen
en-aut-mei=
kn-aut-name=トリン ティ セン
kn-aut-sei=トリン ティ セン
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=SaitohKuniyuki
en-aut-sei=Saitoh
en-aut-mei=Kuniyuki
kn-aut-name=齊藤邦行
kn-aut-sei=齊藤
kn-aut-mei=邦行
aut-affil-num=4
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学自然科学研究科

affil-num=2
en-affil=
kn-affil=岡山大学環境生命科学研究科

affil-num=3
en-affil=
kn-affil=岡山大学自然科学研究科

affil-num=4
en-affil=
kn-affil=岡山大学環境生命科学研究科
en-keyword=Conventional method
kn-keyword=Conventional method
en-keyword=deep fertilizer method
kn-keyword=deep fertilizer method
en-keyword=nitrogen use efficiency
kn-keyword=nitrogen use efficiency
en-keyword=rice (Oryza sativa L.)
kn-keyword=rice (Oryza sativa L.)
en-keyword=slow-release fertilizer
kn-keyword=slow-release fertilizer
END

start-ver=1.4
cd-journal=joma
no-vol=35
cd-vols=
no-issue=
article-no=
start-page=9
end-page=17
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2013
dt-pub=20130401
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=鉄コーティング種子を活用した乾田直播栽培法の開発
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=田邊詩步
kn-aut-sei=田邊
kn-aut-mei=詩步
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=齊藤邦行
kn-aut-sei=齊藤
kn-aut-mei=邦行
aut-affil-num=2
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=山内稔
kn-aut-sei=山内
kn-aut-mei=稔
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学大学院自然科学研究科

affil-num=2
en-affil=
kn-affil=岡山大学農学部附属山陽圏フィールド科学センター

affil-num=3
en-affil=
kn-affil=近畿中国四国農業研究センター
END

start-ver=1.4
cd-journal=joma
no-vol=35
cd-vols=
no-issue=
article-no=
start-page=i
end-page=i
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2013
dt-pub=20130401
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=序
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=齊藤邦行
kn-aut-sei=齊藤
kn-aut-mei=邦行
aut-affil-num=1
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学農学部附属山陽圏フィールド科学センター
END

start-ver=1.4
cd-journal=joma
no-vol=34
cd-vols=
no-issue=
article-no=
start-page=i
end-page=i
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2012
dt-pub=20120401
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=序
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=齊藤邦行
kn-aut-sei=齊藤
kn-aut-mei=邦行
aut-affil-num=1
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学農学部附属山陽圏フィールド科学センター
END

start-ver=1.4
cd-journal=joma
no-vol=101
cd-vols=
no-issue=
article-no=
start-page=25
end-page=32
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2012
dt-pub=20120201
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=Effects of shading and high-temperature treatments on appearance quality of brown rice and palatability of cooked rice
kn-title=水稲玄米の外観品質と米飯の食味に及ぼす高温・遮光処理の影響
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=We examined the appearance quality and palatability of milled rice for each grain-thickness group. The rice cultivars, Nipponbare and Hinohikari, were cultivated at the paddy field of Field Science Center, Okayama University in 2009. For high-temperature treatment, both sides of the transparent chamber were opened when the temperature exceeded 36 degrees C, and closed when lower than 25 degrees C, and 50% shading treatment with black cloth was applied during the grain-filling period. After harvesting, the grains of brown rice were sorted according to thickness using a rice grader, and classified
into eight grain thickness groups, less than 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, and over 2.2mm. The appearance quality of grains was measured, and milled grains were cooked, and the palatability and physical properties were measured. The brown rice yield in high-temperature plots was 10-21% less than control due to the decrease in the ripening percentage and 1000-grains weight. Yield in the shading plot dropped to 16-24% less than control mainly due to the decrease in the ripening percentage. The percentage occupation of grains with 1.8-1.9mm thickness was higher in Hinohikari than Nipponbare. In high-temperature plots, thickness of 1.8-2.0mm decreased and thickness of higher than 2.0mm increased in both cultivars. The shading treatment increased thickness of lower than 1.9mm markedly. It was
cleared that the shading decreased grain thickening growth and grains was distributed more among thinner groups, and high-temperature promoted the grain thickening growth despite the decrease in 1000-grains weight. In both cultivars, the lower the grain thickness group, the lower the percentage of perfect grain due to the increase in the percentage of chalky grain. The palatability value of milled rice
was greater in Hinohikari than Nipponbare. The lower the grain thickness group, the lower the palatability value and stickiness, and those tendencies were remarkable in Nipponbare than Hinohikari. The shading and high-temperature treatments decreased the palatability value and the stickiness, especially in Nipponbare. The palatability value decreased with lower the grain thickness group due to an increase in the percentage occupation of chalky grains.
en-copyright=
kn-copyright=

en-aut-name=IshizukiYuuki
en-aut-sei=Ishizuki
en-aut-mei=Yuuki
kn-aut-name=石突裕樹
kn-aut-sei=石突
kn-aut-mei=裕樹
aut-affil-num=1
ORCID=

en-aut-name=SaitohKuniyuki
en-aut-sei=Saitoh
en-aut-mei=Kuniyuki
kn-aut-name=齊藤邦行
kn-aut-sei=齊藤
kn-aut-mei=邦行
aut-affil-num=2
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学大学院自然科学研究科

affil-num=2
en-affil=
kn-affil=岡山大学大学院自然科学研究科
en-keyword=Chalky rice grains
kn-keyword=Chalky rice grains
en-keyword=Grain thickness group
kn-keyword=Grain thickness group
en-keyword=High-temperature
kn-keyword=High-temperature
en-keyword=palatability
kn-keyword=palatability
en-keyword=Shading
kn-keyword=Shading
END

start-ver=1.4
cd-journal=joma
no-vol=19
cd-vols=
no-issue=
article-no=
start-page=1
end-page=6
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1996
dt-pub=19961227
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=水稲における無代掻き作韓直播栽培浜に関する研究 第3報 緩効性肥料の利用による全量基肥施肥
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=齊藤邦行
kn-aut-sei=齊藤
kn-aut-mei=邦行
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=佐藤貴之
kn-aut-sei=佐藤
kn-aut-mei=貴之
aut-affil-num=2
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=黒田俊郎
kn-aut-sei=黒田
kn-aut-mei=俊郎
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=岡山大学

affil-num=3
en-affil=
kn-affil=岡山大学
END

start-ver=1.4
cd-journal=joma
no-vol=31
cd-vols=
no-issue=
article-no=
start-page=9
end-page=12
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2009
dt-pub=20090401
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=「岡大ライス」の候補品種の選定
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=現在，水田部門では毎年平均45～50トン前後の米を収穫している。以前はその全量をJAに出荷していたが，平成16年からJAへの出荷を止めて，「岡大ライス」と称して生協食堂の米飯用と学内で販売を行ってきた。平成20年度の実績では生協に約37トン，宮下酒造（｢おお岡大｣用）に６トン，残り９トンを一般販売や学内販売している。現在，生協の食堂では‘ヒノヒカリ’と‘アケボノ’をブレンドして使用しているが，それよりも単一品種で安価で美味しい品種はないものかと探していた。九州沖縄農業研究センターで育成された‘あきまさり’(6))は，‘ヒノヒカリ’と同等の食味で収量性も約10％高いことが報告されている。また，‘にこまる’(5))は‘ヒノヒカリ’に比べ高温条件においても白未熟粒の発生が少なく(4))，収量性も優ることが報告されている。そこで，岡山大学フィールド科学センターの主力品種である‘ヒノヒカリ’，‘アケボノ’に‘あきまさり’，‘にこまる’を加えて，2005年と2006年に岡山農場の水田で試験栽培を行い，収量性および食味官能試験を行った。さらに，2007年に八浜農場で小面積の栽培を行い，センター職員および生協職員の協力を得て食味官能試験を行った結果について報告する。
en-copyright=
kn-copyright=

en-aut-name=SaitouKuniyuki
en-aut-sei=Saitou
en-aut-mei=Kuniyuki
kn-aut-name=齊藤邦行
kn-aut-sei=齊藤
kn-aut-mei=邦行
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=多田正人
kn-aut-sei=多田
kn-aut-mei=正人
aut-affil-num=2
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=沼野義和
kn-aut-sei=沼野
kn-aut-mei=義和
aut-affil-num=3
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=小林恭子
kn-aut-sei=小林
kn-aut-mei=恭子
aut-affil-num=4
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=SenTrinh Thi
kn-aut-sei=Sen
kn-aut-mei=Trinh Thi
aut-affil-num=5
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=岡山大学

affil-num=3
en-affil=
kn-affil=岡山大学

affil-num=4
en-affil=
kn-affil=岡山大学

affil-num=5
en-affil=
kn-affil=岡山大学
END

start-ver=1.4
cd-journal=joma
no-vol=97
cd-vols=
no-issue=1
article-no=
start-page=33
end-page=39
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2008
dt-pub=200802
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=Effects of Rising Temperature on Grain Quality and Palatability of Rice Cultivars
kn-title=気温上昇が水稲品種の玄米外観品質，食味におよぼす影響
en-subtitle=
kn-subtitle=
en-abstract=岡山県平野部の主要水稲品種は，中生のヒノヒカリ，晩生のアケボノである．近年，夏期の高温障害が原因とされる乳白米，腹白米などのいわゆる白未熟粒の発生による玄米外観品質の低下が顕著となっており，その回避技術やより高品質，良食味品種の選択など，さまざまな対策が検討されている．このような背景のもと，1996年に九州地方において多収，良食味の観点から「にこまる」，「あきまさり」が育成された．にこまるはヒノヒカリと同等の熟期で極良食味であることに加えて，玄米外観品質が優れ，高温下における白未熟粒の発生が少ない品種である．一方あきまさりは，アケボノと同等の熟期で，ヒノヒカリ並みの食味を有する品種である．すなわち，これら２品種をヒノヒカリ，アケボノに替わる品種として導入することにより，より良食味で高品質米の生産が可能であると考えられる．著者らは，水田および畑圃場に温度勾配チャンバー（TGC）を設置し，温暖化による気温上昇を想定した作物（水稲，ダイズ，冬コムギ）の生産性を評価してきた．水稲（品種：日本晴）では，気温上昇によって不稔籾の増加することで減収となること，白未熟粒の発生によって玄米外観品質が低下することを報告した．また，気温上昇下での米飯の食味についても検討したが，その品種間差については検討を行っていない．本研究では，水田内に設置した TGC を用いて，移植から収穫に至る生育期間全体の気温上昇が，水稲４品種の収量，玄米外観品質，米飯の食味におよぼす影響の品種間差異を検討した．
kn-abstract=The effects of high temperatures on grain quality and palatability of cooked rice of four rice cultivars were examined in a temperature gradient chamber (TGC). Experimental plots going from TG1 (near the air intake side) to TG3 (near the air exhaust side) along the temperature gradient in TGC, corresponding to low and high temperature, and an open field plot (outside of TGC) were arranged. The mean and maximum air-temperatures in TG3 were 3.6℃ and 7.2℃ higher, respectively, than those in TG1. Brown rice yield per m2 in the outside was the highest, and those in the TGC plots were lower than outside in all cultivars. This yield decline was due to the decrease in the percentage of ripened spikelets. The
increase in the percentage of sterile spikelets due to high temperatures in Nikomaru and Akimasari was larger than that in Hinohikari and Akebono. The yield difference among TGC plots was not significant. High temperature increased the white berry grains and white back grains in Hinohikari and Akebono, respectively. The overall eating quality (＋3 to －3) in the outside was in the order of Nikomaru (0.56)
＞Akimasari (0.50)＞Hinohikari (0.00)＞Akebono (－0.06). The overall eating quality in TG3 was lower
than outside, especially in the quality of appearance. However, the decreasing degrees of appearance quality in Nikomaru and Akimasari were smaller than those in Hinohikari and Akebono. The protein content of milled rice in TG3 (6.0−7.8%) was higher than that in the outside (8.6−10.4%) in all cultivars. The increase in protein content by higher temperature was in the order of Akebono (4.4%)＞Hinohikari (1.9%)＝Akimasari (1.9%)＝Nikomaru (0.8%). In terms of grain quality, the cultivation of new cultivars, Nikomaru and Akimasari are recommended when air temperature exceeds normal years. However, yield reductions in Nikomaru and Akimasari caused by high temperatures were larger than those in the conventional cultivars, Hinohikari and Akebono.
en-copyright=
kn-copyright=

en-aut-name=Oh-eIzumi
en-aut-sei=Oh-e
en-aut-mei=Izumi
kn-aut-name=大江和泉
kn-aut-sei=大江
kn-aut-mei=和泉
aut-affil-num=1
ORCID=

en-aut-name=KobayashiYasuko
en-aut-sei=Kobayashi
en-aut-mei=Yasuko
kn-aut-name=小林恭子
kn-aut-sei=小林
kn-aut-mei=恭子
aut-affil-num=2
ORCID=

en-aut-name=SaitohKuniyuki
en-aut-sei=Saitoh
en-aut-mei=Kuniyuki
kn-aut-name=齊藤邦行
kn-aut-sei=齊藤
kn-aut-mei=邦行
aut-affil-num=3
ORCID=

en-aut-name=KurodaToshiro
en-aut-sei=Kuroda
en-aut-mei=Toshiro
kn-aut-name=黒田俊郎
kn-aut-sei=黒田
kn-aut-mei=俊郎
aut-affil-num=4
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=岡山大学

affil-num=3
en-affil=
kn-affil=岡山大学

affil-num=4
en-affil=
kn-affil=岡山大学
en-keyword=Grain quality
kn-keyword=Grain quality
en-keyword=High temperature
kn-keyword=High temperature
en-keyword=Palatability
kn-keyword=Palatability
en-keyword=Rice (Oryza sativa L.)
kn-keyword=Rice (Oryza sativa L.)
END

start-ver=1.4
cd-journal=joma
no-vol=88
cd-vols=
no-issue=1
article-no=
start-page=87
end-page=94
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1999
dt-pub=199902
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=土壌水分の低下がダイズ品種の生育と収量に及ぼす影響-有限伸育型品種と無限伸育型品種の比較-
kn-title=Effect of Moisture Storess on the Growth and Yield of Determinate and Indeterminate Types of Soybean
en-subtitle=
kn-subtitle=
en-abstract=有限伸育型ダイズ品種’エンレイ’と無限伸育型品種’東山69号’を供試し、適宜潅水を行った湿潤区と播種直後以降全く潅水を行わなかった乾燥区を設けて雨よけ栽培を行った。両品種ともに乾燥区の生育、収量および収量構成要素は湿潤区に比べ著しく低下したが、その程度は’エンレイ’に比べ’東山69号’で著しかった。乾燥区の莢数は湿潤区に比べ’エンレイ’で42％、’東山69号’では78％減少したが、これには結莢率の低下よりも花蕾数の減少が大きく影響していた。莢数と収量を高次位と低次位の莢に分けてみると、水分ストレスにより’エンレイ’では低次位の占有率が低下したのに対して、’東山69号’では変化しなかった。同様に主茎と分枝に分けてみると、’東山69号’では主茎の占有割合は増加したのに対して、’エンレイ’では変化しなかった。すなわち、水分ストレスにより、’エンレイ’では低次位花房が、’東山69号’では分枝がより大きく影響を受けることがわかった。乾燥区の結実率、百粒重は湿潤区に比べ著しく低下したが、その程度の品種間差は小さかった。長期の水分ストレスに遭遇した場合、有限伸育品種に比べ無限伸育型品種では生育の停滞、ひいては節数の低下を招き、さらに花蕾数が減少する結果、莢数ひいては収量の低下が著しくなることが推察された。
kn-abstract=The effect of moisture stress on determinate(Enrei)and indeterminate(Touzan69)types of soybean was studied under vinyl house field conditions.Moisture stress seriously reduced the growth,yield components of both soybean types,but the quantitative effects were seen more in Touzan 69 than in Enrei.Although water stress reduced the floral buds and pod setting ratio in both types the differences were not sighification.The contribution to the number of per plant and seed yield on low and high order racemes was unaffected in Touzan 69,while in Enrei,the contribution to these parameters increased on high order racemes and decreased on low order racemes.In Enrei the contribution to
these two parameters on the main stem and branches was not affected by water stress;however,in Touzan 69 the contribution increased 16-18% on the main stem and decreased on the branches.It
was concluded that the contribution to the number of soybean pods per plant at different positions essntially mimicked differences in seed yield.In both soybean types the detrimental effects of water stress on all the yield components resulted in lower total yield.The main difference between both types was that comparatively more reduced growth(less number of nodes/plant)of indeterminate type reduced a greater number of floral buds which also had a synergistic effect on reducing the yield,so ultimately the yield reduced more in indeterminate than in determinate type.
en-copyright=
kn-copyright=

en-aut-name=MahmoodTariq
en-aut-sei=Mahmood
en-aut-mei=Tariq
kn-aut-name=マハムドタリク
kn-aut-sei=マハムド
kn-aut-mei=タリク
aut-affil-num=1
ORCID=

en-aut-name=SaitohKuniyuki
en-aut-sei=Saitoh
en-aut-mei=Kuniyuki
kn-aut-name=齊藤邦行
kn-aut-sei=齊藤
kn-aut-mei=邦行
aut-affil-num=2
ORCID=

en-aut-name=KurodaToshiro
en-aut-sei=Kuroda
en-aut-mei=Toshiro
kn-aut-name=黒田俊郎
kn-aut-sei=黒田
kn-aut-mei=俊郎
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=岡山大学

affil-num=3
en-affil=
kn-affil=岡山大学
en-keyword=determinate type
kn-keyword=determinate type
en-keyword=growth
kn-keyword=growth
en-keyword=indeterminate type
kn-keyword=indeterminate type
en-keyword=raceme order
kn-keyword=raceme order
en-keyword=soybean
kn-keyword=soybean
en-keyword=yield components
kn-keyword=yield components
en-keyword=water stress
kn-keyword=water stress
END

start-ver=1.4
cd-journal=joma
no-vol=93
cd-vols=
no-issue=1
article-no=
start-page=51
end-page=57
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2004
dt-pub=200402
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=Cultivar Differences in Palatability and Physicochemical Properties of Cooked Rice Cultivated in Okayama Prefecture
kn-title=岡山県における主要水稲品種の食味と理化学的特性
en-subtitle=
kn-subtitle=
en-abstract=岡山県における米の食味に関する基礎的知見を得ることを目的として，岡山県の主要水稲品種，コシヒカリ・ヒノヒカリ・朝日・アケボノと日本晴を供試し，岡山・八浜・倉敷の各水田において，異なる施肥段階を設定して栽培を行い，米飯の食味と理化学的特性を調査した．その結果，５品種間ではヒノヒカリが食味官能評価の全項目において最も優れた．朝日は総合評価・粘りでコシヒカリと同等の値を示し，味はコシヒカリよりも優れ，硬さはアケボノよりも硬いことが認められた．３試験地間では長期間無施肥栽培を行っている倉敷水田の食味が優れ，これには土壌窒素含有率が低く，玄米に蓄積されるタンパク質量が少ないことが関係すると考えられた．施肥レベル間では，施肥量の増加に伴い，いずれの品種においても食味値が低下する傾向が認められた．全品種込みで食味の総合評価と精米のタンパク質含有率との間には密接な正の相関関係が認められたが，アミロース含有率との間には直接的な関係は認められなかった．またアミログラム特性の最高粘度とブレークダウンにおいても直線関係は認められなかった．テクスチャー特性においては，Ｈ/－ＨとＨ/A３と総合評価との間に密接な負の相関関係が認められた．このことから，岡山県において，良食味米生産を行うためには，精米の窒素含有率に着目して，収益性を考慮しつつ，食味低下の小さい栽培指針を，それぞれの地域の土壌条件に対応して示すことが必要であると考えられた．
kn-abstract=The palatability and physicochemical properties of cooked rice, in the cultivars Koshihikari, Hinohikari, Asahi and Akebono, which are commonly cultivated in Okayama prefecture were compared with standard cultivar Nipponbare, in the paddy fields of Okayama, Hachihama and Kurashiki Farm of Okayama University. The rate of fertilizer application on those properties in Okayama Farm was also examined. Hinohikari beat the other four cultivars in all tests of palatability. Asahi tested better than Koshihikari, and was harder than Akebono, but in overall eating quality and stikiness it was almost indistinguishable from Koshihikari. The palatability values of cooked rice produced at Kurashiki farm, in which fertilizers were not applied for 25 years, were the highest out of the three locations. It was considered that the protein content of milled rice was lowest in Kurashiki due to the lower nitrogen content of the soil there. In all cultivars the higher the application rate of fertilizer, the lower the values of palatability due to the increase in nitrogen content of the milled rice, but not with amylose content or amylographic characteristics, i.e., maximum viscosity and breakdown values. The textural characteristics, i.e., the ratio of hardness/stichiness and hardness/adhesiveness were negatively correlated with overall eating quality. The results suggested that it is important to create manuals for the production of rice with good eating quality at each location in consideration of the nitrogen content of milled rice and the yield of brown rice.
en-copyright=
kn-copyright=

en-aut-name=YamamotoEma
en-aut-sei=Yamamoto
en-aut-mei=Ema
kn-aut-name=山本永真
kn-aut-sei=山本
kn-aut-mei=永真
aut-affil-num=1
ORCID=

en-aut-name=MatsueYuji
en-aut-sei=Matsue
en-aut-mei=Yuji
kn-aut-name=松江勇次
kn-aut-sei=松江
kn-aut-mei=勇次
aut-affil-num=2
ORCID=

en-aut-name=SaitohKuniyuki
en-aut-sei=Saitoh
en-aut-mei=Kuniyuki
kn-aut-name=齊藤邦行
kn-aut-sei=齊藤
kn-aut-mei=邦行
aut-affil-num=3
ORCID=

en-aut-name=KurodaToshiro
en-aut-sei=Kuroda
en-aut-mei=Toshiro
kn-aut-name=黒田俊郎
kn-aut-sei=黒田
kn-aut-mei=俊郎
aut-affil-num=4
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=福岡県農業総合試験場

affil-num=3
en-affil=
kn-affil=岡山大学

affil-num=4
en-affil=
kn-affil=岡山大学
en-keyword=Fertilizer application
kn-keyword=Fertilizer application
en-keyword=Okayama Prefecture
kn-keyword=Okayama Prefecture
en-keyword=Palatability
kn-keyword=Palatability
en-keyword=Protein content
kn-keyword=Protein content
en-keyword=Rice
kn-keyword=Rice
END

start-ver=1.4
cd-journal=joma
no-vol=96
cd-vols=
no-issue=1
article-no=
start-page=13
end-page=18
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2007
dt-pub=200702
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=Effects of Rising Temperature on Grain Quality, Palatability and Physicochemical Properties of Rice
kn-title=気温上昇が水稲の玄米外観品質, 食味と理化学的特性におよぼす影響
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The effect of high temperatures on grain quality, palatability of cooked rice and physicochemical characteristics of rice was examined in a temperature gradient chamber (TGC). Experimental plots going from TG1 (near the air intake side) and TG4 (near the air exhaust side) along the temperature gradient in TGC, corresponding to low and high temperature, and an open field plot (outside of TGC) were arranged. The mean and maximum air-temperatures in TG4 were 2.8 °C and 5.9 °C higher, respectively,
than those in TG1. Brown rice yield per m2 in outside (572 g) was the highest, and those in TG1 (503 g) and TG4 (180 g) were 12.1 and 68.6ｵ lower than outside, respectively. This yield decline was due to the decrease in the number of panicles and percentage of ripened grains, and an increase in the percentage of sterile spikelets. Most of the immature grain was milky white grains (10.8ﾝ14.6ｵ) and white berry grains (10.7ﾝ43.4ｵ), and other white immature grain accounted for only 0ﾝ2.6ｵ. The grains from the outside plot were separated into perfect grain and milky white grain. The overall eating quality (＋3 to －3) was in the order of perfect grains (0.31) ＞ outside (0.00) ＞ milky white grains (－0.56) ＞ TG1 (－1.0) ＞ TG4 (－1.44). This indicates that the palatability of perfect and milky white grains was
superior to and inferior to that of normal grain, and high temperatures deteriorate the eating quality of cooked rice. In the physicochemical characteristics of rice, the protein content showed a small variation (8.6ﾝ8.9ｵ) between normal, perfect and milky white grains, but that in TG1 (9.9ｵ) and TG4 (9.8ｵ) were higher than that in the outside. Amylose content of each plot was in the same order as the overall eating quality. This showed that amylose content did not affect the palatability because amylose content is normally negatively correlated with overall eating quality. H/-H ratio, a texture characteristic, was smaller in perfect grains than in normal grains, and that in milky white grains was larger than normal grains. This shows that the higher the share of milky white grains, the higher the H/-H ratio. Despite the superior eating quality, H/-H in TG1 was larger than that in TG4. Thus, the effect of H/-H ratio on the palatability of cooked rice grown in TGC was not clear.
en-copyright=
kn-copyright=

en-aut-name=Oh-eIzumi
en-aut-sei=Oh-e
en-aut-mei=Izumi
kn-aut-name=大江和泉
kn-aut-sei=大江
kn-aut-mei=和泉
aut-affil-num=1
ORCID=

en-aut-name=MatsueYuji
en-aut-sei=Matsue
en-aut-mei=Yuji
kn-aut-name=松江勇次
kn-aut-sei=松江
kn-aut-mei=勇次
aut-affil-num=2
ORCID=

en-aut-name=SaitohKuniyuki
en-aut-sei=Saitoh
en-aut-mei=Kuniyuki
kn-aut-name=齊藤邦行
kn-aut-sei=齊藤
kn-aut-mei=邦行
aut-affil-num=3
ORCID=

en-aut-name=KurodaToshiro
en-aut-sei=Kuroda
en-aut-mei=Toshiro
kn-aut-name=黒田俊郎
kn-aut-sei=黒田
kn-aut-mei=俊郎
aut-affil-num=4
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=岡山大学

affil-num=3
en-affil=
kn-affil=岡山大学

affil-num=4
en-affil=
kn-affil=岡山大学
en-keyword=Grain quality
kn-keyword=Grain quality
en-keyword=High temperatures
kn-keyword=High temperatures
en-keyword=Palatability
kn-keyword=Palatability
en-keyword=Physicochemical characteristics
kn-keyword=Physicochemical characteristics
en-keyword=Rice (Oryza sativa L.)
kn-keyword=Rice (Oryza sativa L.)
END

start-ver=1.4
cd-journal=joma
no-vol=95
cd-vols=
no-issue=1
article-no=
start-page=57
end-page=62
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2006
dt-pub=200602
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Effects of Rising Temperature on Growth, Yield and Dry-matter Production of Winter Wheat
en-subtitle=
kn-subtitle=
en-abstract=温暖化による気温上昇を想定し，温度勾配チャンバー（TGC：Temperature Gradient Chamber）を用いて播種から収穫までの長期間の気温上昇処理が，コムギの生育収量，乾物生産におよぼす影響を検討した．TGC は，水田内に設置したものを使用し，換気ファンを常時稼動させることにより昼温のみ温度勾配を生じさせ，栽培試験を行った．コムギ品種イワイノダイチを供試し，開口部から閉口部に向かって対照区TG１，高温区TG２，TG３，TG４の４試験区を配置した．１週間毎の生育調査に加え，部位別乾物重の調査を栄養成長期，出穂期，登熟期，収穫期に行った．また，収穫期に収量と収量構成要素を調査した．TGC 内の気温は，開口部のTG１に比べて閉口部のTG４で平均気温で2.8℃，最高気温で5.8℃の気温上昇がみられた．草丈は，生育期間を通してTG１に比べTG２～TG４の高温区で伸長し，最終草丈はTG１（72.5㎝）＜TG２（74.9㎝）＜TG３（75.6㎝）＜TG４（79.9㎝）の順となった．茎数は，TG１に比べて，TG２では増加，TG３，TG４では減少する傾向がみられたが，有意性は認められなかった．全乾物重は高温区で増加する傾向がみられ，収穫期の全乾物重はTG１に比べてTG２，TG３，TG４でそれぞれ25.9 ，21.2 ，23.2 増加した．出穂後の個葉光合成速度は高温区で低下し，TG１に比べてTG４で出穂15日後には27.8 ，出穂30日後には63.6 と著しく低下した．子実収量は，TG１（218 gm-2）＜TG４（225 gm-2）＜TG３（230 gm-2）＜TG２（248 gm-2）の順となり，これには１穂粒数の増加，千粒重の低下が関係していた．１穂粒数は，高温区で１穂小花数が増加し，それに伴う稔実粒数の増加により多くなった．千粒重は，登熟中期から収穫期にかけての粒重がTG１，TG２では増加したものの，TG３，TG４では抑制傾向にあり，早期に登熟が完了したため高温区で小さくなっ
た．TG２の子実収量は，１穂粒数の増加によるシンクの拡大に加えて，登熟後期まで粒重の増大が継続したため増収となった．TG３，TG４では，粒重が小さく，シンクの拡大を補償できなかったことが減収につながった．気温と子実収量の関係をみると，登熟期の平均気温が28℃を超えることで減収につながることがわかった．以上より，気温上昇は，コムギの生産性を概ね向上させるものの，子実収量に与える影響は稔実粒数の低下よりも，登熟中期以降の子実肥大が影響すると推察された.
kn-abstract=Many studies on the crop response to climate change have been examined for isolated plnts or plants grown in a small-scale popuration. We constructed a Temperature Gradient Chamber(TGC) in a lowland field of Okayama University to clarify the effect of rising temperature on growth, yield and dry-matter production of winter wheat during the whole growth season. The four experimental plots were arranged by the distance from the intake side, TGI(control), TG2, TG3, and TG4. The temperature gradient occurred from TG1 to TG4, the daily ,mean temperature in TG4 increased 2.8℃ more than that of TG1. The dry weight in hight-temperature plots was larger than TG1. The grain yield per M2 was lowest in TG1(218g) and highest in TG2(248g), but gradually decreased with resing temperature in TG3(230g) and TG4(225g). The percentage og spikelet sterility and floret sterillity were not significantly different among the plots. The grain yield tended to decrease with higher the temperature more than 28℃ during the ripening period due to the decrease in dry-matter accumulation in the panicle at the latter ripening period. Clearly, rising temperature increased the wheat grain yield until 28℃ of daily mean temperature during the ripening period, furtuer rise in temperature limited the yild due to the decline in photosynthetic activity.
en-copyright=
kn-copyright=

en-aut-name=Oh-eIzumi
en-aut-sei=Oh-e
en-aut-mei=Izumi
kn-aut-name=大江和泉
kn-aut-sei=大江
kn-aut-mei=和泉
aut-affil-num=1
ORCID=

en-aut-name=SaitohKuniyuki
en-aut-sei=Saitoh
en-aut-mei=Kuniyuki
kn-aut-name=齊藤邦行
kn-aut-sei=齊藤
kn-aut-mei=邦行
aut-affil-num=2
ORCID=

en-aut-name=KurodaToshiro
en-aut-sei=Kuroda
en-aut-mei=Toshiro
kn-aut-name=黒田俊郎
kn-aut-sei=黒田
kn-aut-mei=俊郎
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=岡山大学

affil-num=3
en-affil=
kn-affil=岡山大学
en-keyword=Dry*matter production
kn-keyword=Dry*matter production
en-keyword=Rising temperature
kn-keyword=Rising temperature
en-keyword=Seed dry weight
kn-keyword=Seed dry weight
en-keyword=Wheat
kn-keyword=Wheat
en-keyword=Yield
kn-keyword=Yield
END

start-ver=1.4
cd-journal=joma
no-vol=95
cd-vols=
no-issue=1
article-no=
start-page=49
end-page=55
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2006
dt-pub=200602
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=高温がダイズの開花・結莢におよぼす影響
kn-title=Effects of High Temperature on Flowering and Pod Set in Soybean
en-subtitle=
kn-subtitle=
en-abstract=ダイズ品種エンレイを供試し，雨除けハウス内でポット栽培を行った．開花始から10日間，昼/夜温を27/27，32/27，37/27℃に設定した人工光型グロスチャンバー内でダイズを育成し，処理９日目に開花前日の花蕾について花粉稔性を調査した．花粉稔性は27/27℃処理（97.2）に比べて37/27℃処理（89.4）で有意に低下した．高温に敏感な時期を特定するため，開花始前に２日間，昼/夜温を27/27，40/27℃に設定した人工光型グロスチャンバー内でダイズを育成し，処理後開花した花について花粉稔性を調査した．その結果，処理後４日に開花した花の花粉稔性が27/27℃処理（97.3）に比べて40/27℃処理（82.9）で有意に低下した．すなわち開花前４，５日が高温に特に敏感な時期であることが示され，この時期は雄性生殖細胞分裂期に一致した．しかし，両実験とも結莢率におよぼす高温の影響は小さかった．さらに，自然光下のガラス温室内で開花始前後の４週間について１週間ごとに高温処理を行い，収量成立過程におよぼす影響について検討した．開花始前７～１日の高温処理は栄養成長を促進し結莢率を高めたものの，百粒重を減少させたため，子実収量は対照区とほぼ同様となった．開花始前14～８日の高温処理は２次椏枝の花芽分化を促進しその花蕾数を著しく増加させた結果，結莢率が著しく低下した．以上の結果より，雄性生殖細胞分裂期の高温は花粉稔性を低下させるが，結莢率は花粉稔性よりも花蕾数や開花期の栄養条件によって大きく影響されることが示唆された．
kn-abstract=Plants of soybean(cv.Enrei) were grown in pots(1/5000a) in a viny house. Temperature treatment was conducter for 10 days from the beginning of the flowering period(BFP) in the growth chambers under artificial light controlled at day/night air temperatures of 27/27, 32/27, and 37/27℃, respectively. the pollen viability at 37/27℃(89.4%) was significantly lower than 27/27℃(97.2%). In ouder to identify the sensitive stage to high temperature, the plants were treated for 2 days before BFP in the growth chambers controlled at 27/27 and 40/27 ℃, respectively, and the pollen viability of flowers opening after the treatment was investigates. By the treatment at 40/27℃, the pollen viability of flowers which opened at 4 days after the treatment(82.9%) was significantly lower than 27/27℃(97.3%). This indicates that floral buds at 4 to 5 days before flowering, which coincide with the microsporogenesis stage, are sensitive to high temperature. However, high temperature affected the pod setting ratio a little in both experiments. High temperature treatment was conducted by transferring the plants into the glasshouse under natural light before and after BFP. High temperature treatment at 7-1 days before BFP  promoted vegetative growth and increased the pod setting ratio, while reducing the seed size. High temperature treatment at 14-8 days before BFP promoted floral differentiation on the second order racemes with compound leaves and increased the number of the floral buds, so that reduced the pod setting ratio. These results suggest that hight temperature at the microsporogenesis stage reduces pollen viabillity, however, pod setting ratio is affecter by the pollen viabillity.
en-copyright=
kn-copyright=

en-aut-name=KitanoMachiko
en-aut-sei=Kitano
en-aut-mei=Machiko
kn-aut-name=北野待子
kn-aut-sei=北野
kn-aut-mei=待子
aut-affil-num=1
ORCID=

en-aut-name=SaitohKuniyuki
en-aut-sei=Saitoh
en-aut-mei=Kuniyuki
kn-aut-name=齊藤邦行
kn-aut-sei=齊藤
kn-aut-mei=邦行
aut-affil-num=2
ORCID=

en-aut-name=KurodaToshiro
en-aut-sei=Kuroda
en-aut-mei=Toshiro
kn-aut-name=黒田俊郎
kn-aut-sei=黒田
kn-aut-mei=俊郎
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=岡山大学

affil-num=3
en-affil=
kn-affil=岡山大学
en-keyword=Flowering
kn-keyword=Flowering
en-keyword=High temperature
kn-keyword=High temperature
en-keyword=Pod setting ratio
kn-keyword=Pod setting ratio
en-keyword=aaaaapollen viability
kn-keyword=aaaaapollen viability
en-keyword=Soybean
kn-keyword=Soybean
END

start-ver=1.4
cd-journal=joma
no-vol=18
cd-vols=
no-issue=
article-no=
start-page=1
end-page=7
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1995
dt-pub=19951228
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=水稲における無代掻き作溝直播栽培法に関する研究 第2報カルパー・倒伏軽減剤の処理が生育収量に及ぼす影響
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=本試験はこれまでの直播栽培法の一層の省力化,安定性,多収性および低コスト化を目的として1992年に引き続き無代掻き作溝直播栽培法の実証試験を行った。岡山大学農学部附属農場の水田において品種日本晴を用い,1993年5月18日に乾田状態の水田に溝幅30cmと20cmで作溝を行い,10a当り4.5kgの種子を動力散粒機で播種し,播種後湛水を行った。作溝幅30,20cmそれぞれの区についてカルパーを粉衣した区と無処理区を設けた。また,参考区として慣行移植区を設けた。倒伏防止を目的として出穂前17日に倒伏軽減剤を直播区と移植区の一部に処理した。得られた試験結果の概要は以下のとおりである。(1)湛水後の溝の深さは,溝幅30cm区および20cm区ともに,播種翌日に約1/2となり,湛水直後の溝の崩壊に伴って種子が覆土されることが確認された。(2)出芽・苗立ち率はいずれの区でも高く,特に溝幅30cm区で,さらにカルパー粉衣区で高くなった。また,種子深度は溝幅30cm区が溝幅20cm区より深く,覆土効果は溝幅30cm区で高かった。さらにカルパーを粉衣した区で覆土効果が高くなる傾向があった。(3)穂数は移植区に比べ直播区で,溝幅20cm区に比べ30cm区で多くなったが,カルパー粉衣による影響は小さかった。一穂穎花数は直播区に比べ移植区で多かったが,m2当り穎花数は各区ともに24～28×103の範囲にあった。精玄米収量は溝幅30cm・カルパー粉衣区で582g・m-2と最も高く,移植区よりも多収を示した。(4)9月上旬に接近した台風の影響で各区ともに倒伏がみられたが,倒伏軽減剤の処理により上位節間,葉身長,穂長が短縮し,処理区では全く倒伏が認められなかった。しかし,倒伏軽減剤処理により移植区では増収が認められたが,直播区では収量に及ぼす影響は小さかった。
en-copyright=
kn-copyright=

en-aut-name=SaitohKuniyuki
en-aut-sei=Saitoh
en-aut-mei=Kuniyuki
kn-aut-name=齊藤邦行
kn-aut-sei=齊藤
kn-aut-mei=邦行
aut-affil-num=1
ORCID=

en-aut-name=IshimuraRyo
en-aut-sei=Ishimura
en-aut-mei=Ryo
kn-aut-name=石村亮
kn-aut-sei=石村
kn-aut-mei=亮
aut-affil-num=2
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=藤林哲哉
kn-aut-sei=藤林
kn-aut-mei=哲哉
aut-affil-num=3
ORCID=

en-aut-name=KurodaToshiro
en-aut-sei=Kuroda
en-aut-mei=Toshiro
kn-aut-name=黒田俊郎
kn-aut-sei=黒田
kn-aut-mei=俊郎
aut-affil-num=4
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=岡山大学

affil-num=3
en-affil=
kn-affil=岡山大学

affil-num=4
en-affil=
kn-affil=岡山大学
END

start-ver=1.4
cd-journal=joma
no-vol=17
cd-vols=
no-issue=
article-no=
start-page=1
end-page=8
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1995
dt-pub=19950328
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=水稲における無代掻き作溝直播栽培法に関する研究 第1報作溝幅・湛水方法による生育収量の相違
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=本試験はこれまでの直播栽培法の一層の省力化,安定性,多収性および低コスト化を目的として実証試験を行った。栽培方法は,水稲品種アキヒカリを供試し,10a当たり4.5kgの種子を,無代掻きの作溝区(幅30cm深さ11cm,幅20cm深さ9cm)と無作溝区を設け,湛水後播種した。また,作溝区(幅30cm深さ11cm)に播種後湛水する区と,移植区を設けた。(1)覆土効果は,作溝幅においては20cmより30cmが,また湛水後播種より播種後湛水の方が大きかった。(2)出芽率および苗立ち率は,湛-播30cm区と湛-播20cm区で高く,播-湛30cm区で低かった。(3)草丈は各区ともほぼ同様に推移し,最終的にいずれの直播区も移植区に比ベ10cm以上低くなった。最高分げつ期および出穂期は湛水後播種区で移植区に比べ早まる傾向があった。最高分げつ期茎数は出芽率および苗立ち率と同様な傾向を示した。(4)穂数および精玄米重は出芽率および苗立ち率と同様な傾向を示し,湛-播30cm区＞湛-播無作溝区＞播-湛30cm区の順に高く,精玄米収量は出芽・苗立ちに起因した穂数が著しく影響したと推察された。湛-播30cm区では,移植区に匹敵する精玄米収量が得られた。また直播区と移植区の収量構成要素を比較してみると,移植区では穂数と一穂粒数が高かったのに対し,直播各区では登熟歩合と精玄米千粒重が高かった。(5)以上の結果,湛水後播種を行うことにより,高い苗立ち率が得られ,収量の安定性が確保された。播種後湛水を行った場合,種子深度が大きくなって苗立ち率が低下し,収量は低下した。しかし,覆土効果が高く,出芽・苗立ちの不安定性が克服されれば,倒伏抵抗性の観点からも有効であると考えられた。
en-copyright=
kn-copyright=

en-aut-name=SaitohKuniyuki
en-aut-sei=Saitoh
en-aut-mei=Kuniyuki
kn-aut-name=齊藤邦行
kn-aut-sei=齊藤
kn-aut-mei=邦行
aut-affil-num=1
ORCID=

en-aut-name=IshimuraRyo
en-aut-sei=Ishimura
en-aut-mei=Ryo
kn-aut-name=石村亮
kn-aut-sei=石村
kn-aut-mei=亮
aut-affil-num=2
ORCID=

en-aut-name=KurodaToshiro
en-aut-sei=Kuroda
en-aut-mei=Toshiro
kn-aut-name=黒田俊郎
kn-aut-sei=黒田
kn-aut-mei=俊郎
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=岡山大学

affil-num=3
en-affil=
kn-affil=岡山大学
END