塔里木地区的农作制是一年一熟.但在冬、春麦收获后(七月上、中旬),尚有三个多月的生长期未被利用.我所连续三年以油菜、草木樨、苜蓿、香豆、芸芥五种绿肥作物作比较试验,以芸芥出苗率高、生长势强、产草量高(亩产1,920公斤),对后作的增产作用最大.一、芸芥对后作的增产作用每亩翻耕3,000—4,000公斤芸芥绿色体,一般可使小麦增产40%以上;每1,000斤绿色体增产小麦籽粒34.7—38.3斤;相当于施同样数量的优质羊粪(表1). The cropping system in the Tarim area is a one-year crop, but in the winter and spring wheat harvests (mid-July and early July), there are still not more than three months of growth. Alfalfa, coumarin, eruntium five kinds of green manure crop for comparison test to Yunbai emergence rate is high, strong growth potential, high yield (1,920 kilograms per mu), after the maximum effect of increasing production. After the increase of yield per mu plowing 3,000-4,000 kilograms of green jatropha, generally can increase wheat yield more than 40%; for every 1,000 kg of green body yield 34.7-38.3 kg of wheat grain; equivalent to the same amount of high-quality sheep manure Table 1).