ABSTRACT

Non-puddling rice cultivation would increase subsequent soybean yield. Soybean (cv. ‘Yukihomare’) was grown in farmers’ fields previously cultivated with puddled transplanted rice (Puddled Rice), non-puddled transplanted rice (Non-puddled Rice), and dry direct-seeded rice (Direct-seeded Rice) in central Hokkaido, Japan. Average soybean yield was significantly (p < 0.05) higher in Non-puddled Rice fields (411 g m⁻²) and in Direct-seeded Rice fields (404 g m⁻²) than in Puddled Rice fields (352 g m⁻²). The respective yield increases (16.8% and 14.7%) indicate that non-puddling rice cultivation increased subsequent soybean yield. The significantly higher values for shoot dry weight and number of seeds per m² seen in fields after non-puddling rice cultivation suggest that non-optimal plant development during vegetative and early reproductive growth stages may be ameliorated. The increases in soybean yield seen in this study may encourage the adoption of non-puddling rice production under the rice–soybean rotation system in Japan.

摘要

不混养水稻将增加随后的大豆产量。大豆（cv。'Yukihomare'）种植在农民的田地里，以前曾在该地区种植过带水transplant的插秧稻米（Pudded Rice），非带水transplant的插秧稻米（Non-pudled Rice）和干式直纹稻（Direct-seeded Rice）稻米。日本北海道中部。非水化稻田（411 gm ^-2）和直播水稻田（404 gm ^-2）的平均大豆产量比水化稻田（352 gm ^-2）高（p <0.05 ）。各自的增产（分别为16.8％和14.7％）表明，非水化水稻种植可提高随后的大豆产量。苗干重和每m ²种子数明显更高的值在非水化水稻种植后在田间观察到的现象表明，在营养生长和早期生殖生长阶段，植物的非最佳发育可能会得到改善。在这项研究中看到的大豆单产的增加可能会鼓励日本在稻米-大豆轮作制度下采用非水产大米。