耕うん・播種法の相違が乾田直播水稲の出芽・生育ならびに収量に及ぼす影響

日本作物学会紀事

名越 時秀¹  岡部 繭子²  玉井 富士雄¹  元田 義春¹  武田 元吉¹ 

[1] 東京農業大学農学部;東京農業大学大学院農学研究科

关键词: Direct seeding in well-drained paddy field;    乾田直播;    Emergence;    出芽;    Panicle differentiated from high nodal position;    高節位分げつ穂;    Seeding method;    播種法;    Tilling method;    耕うん法;    Stratified clip method;    茎葉層別刈取;   

DOI  :  10.1626/jcs.74.125

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

This study was conducted to examine the effects of tilling and seeding methods on the growth of rice direct-seeded in well-drained paddy field. The tilling methods used were plowing, non-tilling, and non-tilling-V-shape furrowing. The seeding methods used were dibbling at 1, 3 and 5 cm depth under the plowing condition, dibbling at 1 and 3 cm depth under non-tilling condition, and shallow and deep soil covering under the non-tilling-V-shape furrowing condition. Cultivar Koshihikari was used in this study. The percentage of emergence in most plots was higher than 70%, except for dibbling at 5 cm depth under plowing condition. Mesocotyl and the second internode elongated in some plots. In all plots, non-productive tillers rarely appeared. Many panicles differentiated on the tillers at nodal positions higher than the fourth node from the neck node of panicle, except for the plants seeded by dibbling at a 1 and 3 cm depth under a plowing condition. Dry matter weights of leaves and culms in direct-seeded plants were biased to the lower part of the plants compared with the transplanted plants. As a whole, the plants seeded by soil covering under non-tilling-V-shape furrowing condition showed the best growth, although there is a possibility of lodging in the field. When seeded by dibbling at a 3 cm depth under a non-tilling condition, the emergence was good and the lodging was not observed, but the panicle number was somewhat low.

【 授权许可】

Unknown