为了进一步向生产的深度和广度进军,我们农科所学习外地提高复种指数的经验,从1972年开始试验豆、棉间作。1972年试种面积1.17亩,亩产黄豆115斤,皮棉200斤;1973年又搞了1.47亩的菜、豆、棉间作套种,亩产蔬菜6,000斤,黄豆104斤,皮棉150斤。在两年套种基本成功的基础上,1974年,我们进一步搞了麦、豆、棉三熟套种试验,面积1.19亩,亩产小麦510斤,黄豆130斤,皮棉205斤。 In order to further advance to the depth and breadth of production, we have learned the experience of improving the cropping index in the field. Since 1972, we have experimented on bean and cotton intercropping. The area planted in 1972 was 1.17 mu, 115 kg per mu of soybean and 200 kg of lint. In 1973, 1.47 mu of vegetables, beans and cotton were interplanted. The yield was 6,000 kg mu of vegetables, 104 kg of soybeans and 150 kg of lint. Based on the basic success of the two-year inter planting, in 1974, we further experimented on the interplanting of wheat, beans and cotton with an area of ​​1.19 mu, an area of ​​1.19 mu per mu of wheat, 130 kg of soybean and 205 kg of lint.