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1试验设计四川常年有稻─麦两熟制稻田近66．7万hm2，在水稻收获后到小麦播种前，稻田休闲长达60－80天。80年代中期以来，为了充分利用秋季的光、热资源和空闲期的土地，提高稻田的复种指数，各地区相继开展了直播种植秋大豆等作物或绿肥的研究。但由于现在水稻品种成熟较迟，
1 Experimental Design There are nearly 667,000 hm2 paddy-wheat double cropping systems in Sichuan Province. Before paddy harvesting until wheat is planted, paddy fields are as long as 60-80 days leisure time. Since the mid-1980s, in order to make full use of the autumn light and heat resources and the land during the idle period and to increase the mulching index of paddy fields, various regions have carried out researches on the direct seeding crops such as autumn soybean or green manure. However, due to the late maturity of rice varieties,