富山県における水稲品種「コシヒカリ」の高温登熟回避を目的とした 晩植栽培に適した栽植密度

日本作物学会紀事

杉森 史郎¹  守田 和弘³  古畑 昌巳⁴  高橋 渉² 

[1] 富山農林振興センター;富山県農産食品課;富山県農林水産総合技術センター食品研究所;中央農業総合研究センター北陸研究センター

关键词: Grain quality;    品質;    High temperature;    高温;    Koshihikari;    コシヒカリ;    Planting density;    栽植密度;    Rice;    水稲;    Transplanting time;    移植時期;    Yield;    収量;   

DOI  :  10.1626/jcs.80.220

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

In order to avoid a high temperature during the ripening period, the effects of late transplanting and high planting density on the growth, yield and grain quality of rice (Oryza sativa L. cv. ‘Koshihikari’) were investigated for two years. Transplanting in mid-May (late transplanting) reduced maximum tillers number and panicle number than did transplanting on late-April (early transplanting), resulting in yield decrease. However, late transplanting improved grain quality in 2005 when the late transplanting lowered temperature during the ripening period. Under early transplanting, high planting density led to overluxuriant growth and, in some cases, the extreme decrease in leaf color, resulting in the poor grain quality. Under the late transplanting, on the other hand, high planting density increased the number of panicles and yield. In addition, high planting density in late transplanting improved grain quality due to decreased number of grains per panicle. These results suggest that the high planting density is effective to improve yield and grain quality under late transplanting for avoiding high temperature during the ripening period.

【 授权许可】

Unknown