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豆科作物在土壤保持耕作中形成覆盖时,不仅可以减少地表径流和水分蒸发,增加土壤的有机物和土壤中的氮,而且还可以促使水分渗透,提高水的利用效率.在春季,种植豆科覆盖作物地块的土壤含水量比不种植的地块低3～5%,然而当用豆科作物秸秆覆盖2周后,土壤水分含量开始明显提高.豆科作物根瘤产生的氮虽然不能够充分满足玉米生长的需要,但是可多少降低农用化肥的施用量,同时保持作物稳产,施肥量同等的情况下,有没有豆科作物覆盖,作物的产量是大不一样的.这些效益显然是由于豆科覆盖作物增加了土壤中的有效水分.抑制了杂草的生长,提高了轮作的效果.在肯塔基州,有野豌豆作覆盖同时施肥100kg/ha相对于冬季休耕地施肥量100kg/ha的地块平均稳定增产500kg/(ha·年),高产进一步说明豆科作物覆盖是经济可行的,这种条播作物的农业形式是值得发展的.
When legumes are covered in soil conservation tillage, they not only reduce surface runoff and evaporation of water, increase soil organic matter and soil nitrogen, but also promote water infiltration and improve water use efficiency. In the spring, The soil moisture content of crop plots covered 3 ~ 5% lower than the non-planted plots, however, soil moisture content began to increase significantly when covered with leguminous crops straw for 2 weeks. Although the nitrogen produced by legume crops nodules did not fully To meet the needs of corn growth, but crop yield can vary greatly depending on how much the fertilizer is applied, while maintaining the crop stable and fertilizing at the same level. These benefits are clearly due to the fact that beans Coverage of crops increased soil available moisture, inhibited weed growth and improved crop rotation. In Kentucky, there were plots of wild pea covering 100 kg / ha at the same time fertilizing 100 kg ha per hectare of fallow An average yield increase of 500kg / (ha · year), high yield further illustrates legume crop coverage is economically viable, the agricultural form of this sowing crop is worth the development.