棉田种植绿肥是解决棉花肥料的一种重要途径。我省棉田绿肥1966年曾发展到450余万亩,一般亩产青草在1,500—3,000斤之间,对棉花增产曾起到一定的作用。 一、棉田绿肥的肥效 根据分析测定,压青2,000斤的含氮量:蚕豆是10斤,相当于140斤豆饼;黄花苜蓿或箭舌豌豆是13斤,相当于180余斤豆饼;苕子是12斤,相当于170斤豆饼。等氮量情况下, Planting green manure in cotton fields is an important way to solve the problem of cotton fertilizer. Our province cotton green manure in 1966 has developed to more than 450 acres, the general mu produce grass in between 1,500-3,000 pounds, cotton yield has played a certain role. First, the fertilizer efficiency of green manure in cotton According to the analysis and determination, the pressure of 2,000 pounds of nitrogen content: beans is 10 pounds, equivalent to 140 pounds of bean cake; yellow alfalfa or arrow tongue peas is 13 pounds, equivalent to 180 jumbo bean cake; 12 pounds, equivalent to 170 pounds bean cake. Under other nitrogen conditions,