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我旗每年种植豌豆、蚕豆、山黧豆等9万余亩,占作物播种面积15—20%。豆类根茬既是肥茬又是热茬,肥田增产十分显著,群众称之为二压青地。豆类根部长着很多根瘤菌,能吸收固定空气中游离氮素。经调查一平方米0~30厘米土壤里一般鲜根重为0.5斤,有根瘤1,500个。折合亩鲜根重350斤,有根瘤90~100万个,起到肥地增产作用。
Every year, I plant more than 90,000 acres of peas, broad beans and shaddock beans, accounting for 15-20% of the sown area of the crops. Beans stubble is both stubble and hot stubble, fertilizing yield is very significant, the masses called the second pressure green. Roots of legumes grow many rhizobia, which can absorb free nitrogen in fixed air. After a survey of 0 to 30 centimeters a square soil fresh root weight is generally 0.5 pounds, 1,500 nodules. Equivalent to the weight of 350 kg of fresh roots, there are 90 to 1 million nodules, play a role in increasing fertility.