研究了苜蓿、玉米和大豆3种茬口对缓解连作大豆危害的效果。结果表明:苜蓿茬连作2年和3年大豆产量比玉米茬连作2年和3年大豆产量分别增加8.4%、6.6%,比3年和4年连作大豆产量分别极显著增加26.7%和27.5%;玉米茬连 The effects of alfalfa, corn and soybean stubble on alleviating continuous crop damage were studied. The results showed that the soybean yield of alfalfa stubble continuous cropping two years and three years increased by 8.4% and 6.6% respectively compared with two years and three years continuous cropping of corn stubble, increased significantly by 26.7% and 27.5% respectively over the three years and four years continuous cropping soybean production, ; Corn stubble even