1979和1980年,我们在四川地区的几个部队农场,对水稻直播作了较大面积的试验研究。试验田大都是机械改土后耕种了3—5年的泥田,肥力中等,施肥水平相当于大面积一季中稻的用量(纯氮18—25斤)。1979年大部分是人工撒播,1980年大部分是机播。供试品 In 1979 and 1980, we conducted a large-scale pilot study of rice direct seeding in several army farms in Sichuan. Most of the experimental fields were cultivated for 3-5 years after mechanized soil improvement. Soil fertility was moderate and the level of fertilization was equivalent to the amount of medium-season rice in a large area (18-25 kg of pure nitrogen). In 1979, most of them were broadcast by hand, most of which were airborne in 1980. testing sample