沙打旺(Astragalus adsurgens)是北方飞播牧草广为利用的重要草种之一。它的适应性强,具有耐干旱、耐瘠薄、耐盐碱及抗风沙等特性。近年来,我们开展了飞播沙打旺改良草原和治理黄土高原水土流失的试验研究。据调查,飞播区往往都是土壤贫瘠和没有种过豆科植物的地方,所以沙打旺苗期形成的根瘤不多。为此,我们从1982年开始进行了沙打旺种子丸衣化接种根瘤菌的试验,为大面积推广、应用根瘤菌提供依据。一、试验区自然概况试验在内蒙古科左后旗哈拉勿苏公社进 Astragalus adsurgens is one of the most important grass species widely used in northern aerial seeding. Its adaptability, with drought-resistant, barren, salt and wind sand and other characteristics. In recent years, we have carried out experimental studies on the improvement of soil and water on the Loess Plateau through aerial seeding, sand planting, and harnessing. According to the survey, the airborne area is often poor soil and no species of legumes planted, so the seedlings formed sandstone seedlings not much. To this end, we started from 1982 to test the seedlings of sand seed seed dressing inoculation rhizobia, for large-scale promotion, application Rhizobia provide the basis. First, the test area natural profile test Kelao Houqi Inner Mongolia Hara notsu commune into