湛水直播水稲における出穂後日数の経過が耐倒伏性と稈基部の物理的性質に及ぼす影響

日本作物学会紀事

有馬 進²  古畑 昌巳¹ 

[1] 中央農業総合研究センター北陸研究センター;佐賀大学農学部

关键词: Breaking strength of culm with leaf sheaths;    葉鞘付挫折時モーメント;    Days after heading;    出穂後日数;    Direct seeding in flooded paddy field;    湛水直播;    Leaf sheath;    葉鞘;    Lodging resistance;    耐倒伏性;    Rice;    イネ;    Section modulus;    断面係数;    Varietal difference;    品種間差異;   

DOI  :  10.1626/jcs.76.529

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

We examined how lodging resistance and physical characteristics of the basal culm change after heading in rice direct-seeded in a flooded paddy field using 14 rice varieties. At 5 weeks after heading, the pushing resistance was lower, and lodging index was larger than at 2 weeks after heading in the majority of varieties, and lodging was observed in some varieties. This is probably because panicle weight/top weight ratio was increased, and the section modules and breaking strength of the culm with leaf sheaths were decreased with decreasing number of living leaf sheaths at the basal culm. In Saikai 203 that had high yielding ability, the senescence of leaf sheaths was late, and the section modules and breaking strength of the culm with leaf sheaths were maintained high even at 5 weeks after heading. As a result, pushing resistance was high, and lodging index was small even at 5 weeks after heading, showing excellent lodging resistance.

【 授权许可】

Unknown