乐都县蒲台公社赵家坪大队是个纯浅山地区,干旱、缺肥严重影响产量的提高。为了解决这个问题,近两年,在歇地试种箭筈豌豆作绿肥,获得了显著的增产养地效果。箭筈豌豆一般亩产鲜草1000—2000斤,生长好的可达3000斤左右,在开花期翻压作绿肥,第二年种植小麦,其产量要比歇地或豆茬的小麦增加40%左右。一、施用绿肥的作用,主要表现在:(一)提高土壤有机质含量及土壤有效养分,特别是氮的含量增加。箭筈豌豆植株养分含量较高,据分析,全氮含量为2.83%,全磷0.41%,全钾3.10%。若按亩产鲜草1500斤计算,一亩绿肥地上部分有氮素8.49斤,磷素1.22斤,钾素9.30斤。磷 Zhao Town, Pudu commune, Ledu County is a purely shallow mountain area, drought, lack of fat seriously affect the production increase. In order to solve this problem, in the last two years, intermittently planting arrowhead peas as green manure has obtained remarkable yield increase and raising effect. Arrowheads peas general acres of fresh grass 1000-2000 pounds, grow well up to 3000 pounds, turning green during the flowering manure, the second year of planting wheat, its output than the intermittent or stubble wheat increased by 40% about. First, the role of green manure, mainly in: (A) increase soil organic matter content and soil available nutrients, especially nitrogen content increased. Arrowheadia pea plant nutrient content is higher, according to analysis, total nitrogen content of 2.83%, 0.41% of total phosphorus, 3.10% of total potassium. If per mu yield of 1,500 kg of fresh grass, green acre fertilizer on the ground part of the 8.49 kg of nitrogen, phosphorus, 1.22 pounds, potassium 9.30 pounds. phosphorus