豆类幼苗期根部根瘤菌很少,固氮能力很弱,如播种前用根瘤菌剂拌种,能提高幼苗根部根瘤菌的数量和固氮能力,起到增产的效果。尤其是未种过豆类作物的地块、新垦荒地或地力瘠薄的地块,首次种豆科蔬菜时,接种根瘤 Rhizobium in the root stage of legumes had few rhizobia, and its ability to fix nitrogen was very weak. For example, seed dressing with rhizobia prior to sowing could increase the number of root nodule bacteria and nitrogen fixation ability in seedling roots, and increase the yield. Especially the plots that have not been planted with leguminous crops, newly reclaimed wasteland or barren land, when the first legume vegetables are inoculated with nodules