江苏省沿海地区滩涂辽阔,自然条件优越,土地资源丰富,现有滩涂面积523万亩,发展饲料牧草潜力很大。为发展牧草种植业,给发展本区畜牧业创造条件,我们开展了紫花苜蓿与多年生禾本科牧草混播及其改土效果试验研究。一、试验内容及方法试验地为滨海盐渍土,粉沙壤质,土壤含氯盐0.20～0.25%,有机质1.07%。以多年生禾本科牧草——牛尾草、鸡脚草、黑麦草分别与紫花苜蓿进行同行混播与间行混播,行距15厘米。播种量:紫花苜蓿1公斤/亩,牛尾草1公斤/亩,鸡脚草1.1公斤/亩,黑麦草1公斤/亩(同行条播与间行条播的播量一样)。紫花苜蓿种子纯净度为76%,发芽率90%;牛尾草的纯净度90%,发芽率85%;鸡脚草的纯净度66%,发芽率80%;黑麦草 There are vast beaches in Jiangsu coastal area with excellent natural conditions and rich land resources. The existing beach area is 5.23 million mu and there is great potential for fodder and forage development. In order to develop the forage planting industry and create the conditions for the development of animal husbandry in this area, we carried out the experimental study on the mixed planting of alfalfa and perennial grasses and its improvement effect on soil. First, the test content and methods of test for the coastal saline soil, silt loam soil, soil chlorine content 0.20 ~ 0.25%, organic matter 1.07%. Perennial grasses - oxtail grass, chicken feet grass, ryegrass were mixed with alfalfa sowing and interplanting, spacing 15 cm. Seeding rate: alfalfa 1 kg / mu, 1 kg of talon grass / mu, chicken feet and grass 1.1 kg / mu, 1 kg ryegrass / mu (peer broadcast and inter-line broadcast sowing the same). Alfalfa seed purity of 76%, the germination rate of 90%; the purity of the tail grass 90% germination rate of 85%; prickly heat purity of 66%, the germination rate of 80%; rye grass