飞机播种牧草是改良草场的有效措施之一。飞播牧草中豆科牧草占很大比例。但是,过去播种豆科牧草时都不接种根瘤菌。从1981年开始我们对一些豆科牧草的自然结瘤情况进行了调查。发现广西畜牧所草场种植的6种红三叶草和白三叶草根瘤很少,甚至没有根瘤;新西兰红三叶草在贵州省威宁飞播区不形成根瘤;中国农科院畜牧所草场 Plane seeding is one of the effective measures to improve pasture. Flying seeding forage legume grass accounted for a large proportion. However, rhizobia were not inoculated when legumes were sown in the past. Since 1981 we have investigated the natural nodulation of some leguminous pastures. Found that six kinds of red clover and white clover planted in Guangxi pasture grassland had few nodules and no nodules. New Zealand red clover did not form nodules in the weeding area of ​​Weining, Guizhou Province. The pasture of the Chinese Academy of Agricultural Sciences