イネ（Oryza sativa L.）大粒品種「秋田63号」の窒素施肥反応

日本作物学会紀事

松波 麻耶¹  国分 牧衛¹  張 文会² 

[1] 東北大学大学院農学研究科;中国聊城大学生命科学学院

关键词: Akita 63;    秋田63号;    Rice;    イネ;    Yield;    収量;    Sink size;    シンクサイズ;    Large-grain cultivar;    大粒品種;    Nitrogen fertilization;    窒素施肥法;   

DOI  :  10.1626/jcs.78.497

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

A new rice cultivar Akita 63 which has a relatively heavy 1000-grain weight (30 g) is expected to possess a high yield potential. To develop a suitable nitrogen (N) fertilization method for maximizing the yield potential of Akita 63, we investigated the effects of three patterns of N fertilization; early topdressing (ET) [basal dressing, topdressing at the tillering stage, topdressing at ear formation stage, topdressing at the ripening stage = 6, 2, 2, 0 kg N / 10 a], late topdressing (LT) [4, 0, 4, 2 kg N / 10 a] and even fertilization (EF) [4, 2, 2, 2 kg N / 10 a]. ET markedly stimulated tillering, but produced a large number of non-productive tillers. The photosynthetic rate during the ripening stage was lower in the ET plot due to the lower leaf N content than in the other treatments. In LT, the development of tiller was slower, resulting in the smallest panicle number and yield among the three treatments. In EF, panicle number, spikelet number per unit area, N uptake and photosynthetic rate were the greatest, leading to the highest yield among the three nitrogen treatments. These results suggest that the even fertilization over the growth period is necessary to realize the high yielding potential of Akita 63.

【 授权许可】

Unknown