我县麦棉两熟地区,由于绿肥及其它有机肥用量减少,造成土壤板结,肥力下降,产量低,成本高。近几年来,我县广泛进行棉田套种夏绿肥的试验,收到增加棉田有机质,改善土壤理化性状,养地增产,降低成本的效果。增产效果豆科夏绿肥生长时间短,鲜草产量高,养地增产效果好。据杨湾公社农科所1974—1977年四年的试验,棉田套种豆科夏绿肥平均亩产鲜草1,020斤。去年,全县棉区五个公社、六个点、十一块棉田套种豆科夏绿肥试验地平均亩产鲜草813.5斤。在棉花苗期,夏绿肥覆盖部分地面,能稳定地温,抑制杂草滋生,促进棉苗生长。蕾期翻压绿肥,对棉花有蹲苗控制旺长的作用。压青后,绿肥腐烂,逐渐释放养分,正好满足棉花铃期需肥要求,有利于稳长,防早衰,促结 Due to the decrease of green manure and other organic manure, cotton paddy and cotton double cropland in our county caused soil compaction, decreased fertility, low yield and high cost. In recent years, our county has extensively experimented with intercropped summer green manures in cotton fields and received the effect of increasing the organic matter in the cotton field, improving the physical and chemical properties of the soil, raising land and increasing production, and reducing costs. Increasing effect of legume summer green manure growth time is short, fresh grass yield, raising land production effect. According to Yang Bay Commune Agricultural Science Institute 1974-1977 four years of trials, interplanting legume summer green manure average yield 1,020 pounds of fresh grass. Last year, the county cotton area five communes, six points, eleven cotton interplanting legume summer green manure test average yield of fresh grass 813.5 kg. In the cotton seedling stage, summer green manure covers part of the ground, can be stable temperature, inhibit weeds breeding, and promote cotton seedling growth. Budding turn green manure, squat seedling control of cotton has a long role. Green pressure, green manure decay, and gradually release nutrients, just to meet the needs of bolls cotton needs, is conducive to stability, prevent premature senility and promote knot