Author 出江 嘉朗| Saitoh, Kuniyuki|
Published Date 2016-04-01
Publication Title Bulletin of the Field Science Center, Faculty of Agriculture, Okayama University
Volume volume38
Content Type Departmental Bulletin Paper
Author 田邊 詩步| 齊藤 邦行| 山内 稔|
Published Date 2013-04-01
Publication Title 岡山大学農学部センター報告
Volume volume35
Content Type Departmental Bulletin Paper
Title Alternative Comparisons of nitrogen use efficiency between rice cv. Nipponbare and Takanari at different fertilization levels
FullText URL srfa_113_033_039.pdf
Author Saitoh, Kuniyuki| Danno, Yusuke|
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.
Keywords High-yielding rice cultivar Nitrogen use efficiency Nitrogen uptake Sink capacity Sink production efficiency
Publication Title Scientific Reports of the Faculty of Agriculture, Okayama University
Published Date 2024-02-01
Volume volume113
Start Page 33
End Page 39
ISSN 2186-7755
language Japanese
File Version publisher
Author Ishizuki, Yuuki| Saitoh, Kuniyuki|
Published Date 2012-02-01
Publication Title 岡山大学農学部学術報告
Volume volume101
Content Type Departmental Bulletin Paper
Title Alternative Cultivar differences in nitrogen use efficiency of rice
FullText URL srfa_113_017_024.pdf
Author Saitoh, Kuniyuki| Iwame, Yoshifumi| Maekawa, Masahiko| Takeda, Kazuyoshi|
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.
Keywords High-yielding rice cultivar Nitrogen use efficiency Nitrogen uptake Sink capacity Sink production efficiency Unfertilized paddy field
Publication Title Scientific Reports of the Faculty of Agriculture, Okayama University
Published Date 2024-02-01
Volume volume113
Start Page 17
End Page 24
ISSN 2186-7755
language Japanese
File Version publisher
Author 齊藤 邦行| 佐藤 貴之| 黒田 俊郎|
Published Date 1996-12-27
Publication Title 岡山大学農学部農場報告
Volume volume19
Content Type Departmental Bulletin Paper
Author Saitoh, Kuniyuki| Ishimura, Ryo| 藤林 哲哉| Kuroda, Toshiro|
Published Date 1995-12-28
Publication Title 岡山大学農学部農場報告
Volume volume18
Content Type Departmental Bulletin Paper
Author Saitoh, Kuniyuki| Ishimura, Ryo| Kuroda, Toshiro|
Published Date 1995-03-28
Publication Title 岡山大学農学部農場報告
Volume volume17
Content Type Departmental Bulletin Paper
Author Oh-e, Izumi| Kobayashi, Yasuko| Saitoh, Kuniyuki| Kuroda, Toshiro|
Published Date 2008-02
Publication Title 岡山大学農学部学術報告
Volume volume97
Issue issue1
Content Type Departmental Bulletin Paper
Author Oh-e, Izumi| Matsue, Yuji| Saitoh, Kuniyuki| Kuroda, Toshiro|
Published Date 2007-02
Publication Title 岡山大学農学部学術報告
Volume volume96
Issue issue1
Content Type Departmental Bulletin Paper
FullText URL bfsc_042_pre.pdf
Author 齊藤 邦行|
Publication Title Bulletin of the Field Science Center, Faculty of Agriculture, Okayama University
Published Date 2020-04-01
Volume volume42
Start Page i
End Page i
ISSN 0910-8742
language Japanese
Copyright Holders 岡山大学農学部
File Version publisher
Author 齊藤 邦行|
Published Date 2012-04-01
Publication Title 岡山大学農学部センター報告
Volume volume34
Content Type Others
Author 齊藤 邦行|
Published Date 2013-04-01
Publication Title 岡山大学農学部センター報告
Volume volume35
Content Type Others
Author 齊藤 邦行|
Published Date 2014-04-01
Publication Title 岡山大学農学部センター報告
Volume volume36
Content Type Others
Author 齊藤 邦行|
Published Date 2015-04-01
Publication Title 岡山大学農学部センター報告
Volume volume37
Content Type Others
Author Yamamoto, Ema| Matsue, Yuji| Saitoh, Kuniyuki| Kuroda, Toshiro|
Published Date 2004-02
Publication Title 岡山大学農学部学術報告
Volume volume93
Issue issue1
Content Type Departmental Bulletin Paper
Author Saitou, Kuniyuki| 多田 正人| 沼野 義和| 小林 恭子| Sen Trinh Thi|
Published Date 2009-04-01
Publication Title 岡山大学農学部センター報告
Volume volume31
Content Type Departmental Bulletin Paper
Author Yabe, Ryo| Nguyen Quang Co| Trinh Thi Sen| Saitoh, Kuniyuki|
Published Date 2015-02-01
Publication Title 岡山大学農学部学術報告
Volume volume104
Content Type Departmental Bulletin Paper
Author Oh-e, Izumi| Saitoh, Kuniyuki| Kuroda, Toshiro|
Published Date 2006-02
Publication Title 岡山大学農学部学術報告
Volume volume95
Issue issue1
Content Type Departmental Bulletin Paper
Author Kitano, Machiko| Saitoh, Kuniyuki| Kuroda, Toshiro|
Published Date 2006-02
Publication Title 岡山大学農学部学術報告
Volume volume95
Issue issue1
Content Type Departmental Bulletin Paper