定海县盐仓公社上游大队依山临海,土壤母质为浅海沉积,土性泥粘肥力低,酸碱度为6.8—7.45,土壤含磷量全磷为0.144%,速效磷为14ppm。过去冬季绿肥都是种植黄花苜蓿(当地叫草子),贫下中农说种“草子”花工多,土地利用率低,鲜草产量低。1963年起开始种紫云英(当地叫“秕花”),但是由于没有掌握好淡涂泥田种好紫云英的方法,鲜草产量一般只有二、三千斤,影响早稻产量的提高。有人说:“淡涂泥田秋旱要爬咸,不适合种秕花。”遵照毛主席“一切经过试验”的教导,我们从1969年下半年起在上游大队与贫下中农一起开展了在淡涂泥田种好紫云英的科学实验。三年来的科学实验和生产实践表明,沿海淡涂泥田只要做到“土地平整,开沟排水,种 The upstream brigade of Yancang Commune in Dinghai County is located in the sea and the parent material of the sea is shallow sea sediment. The clay has low fertility, pH 6.8-7.45, phosphorus 0.144%, phosphorus 14ppm. Past green manure is planted with alfalfa (local call grass), poor middle peasants say “grass” flowers and more labor, land utilization is low, fresh grass yield is low. Since 1963, the plant has started to plant the milk vetch (locally called “Suihua”). However, the production of fresh grass is generally only 2-3 kilograms, which has an impact on the improvement of the yield of early rice. Some people say: “In the autumn muddy dry autumn drought to climb salty, not suitable for the kind of flower.” In accordance with Chairman Mao “all tested” teaching, we from the second half of 1969 in the upstream brigade and underdeveloped peasants carried out in light coating The muddy field is good for the scientific experiment of Astragalus mongolica. Three years of scientific experiments and production practices show that as long as the coast of lightly coated mud so that "land formation, ditching drainage, species