关键词: 飞机草, 飞机草, 急性LD50, 亚急性毒性, 小白鼠

Abstract: The conventional fertilization mode is not fit for conservation tillage, Conservation tillage mostly consists of no tillage or minimum tillage and the straw or stubble is often on the surface of the land, which results that fertilizer can not be mixed equably into the soil. In order to resolve the problem of insufficient amounts of fertilizer, simplex fertilization mode and lacking mulch on the soil surface, utilize the balanced fertilization methods to determine the amounts of fertilizer, design the experiment in blocks split. The main treatments include conventional tillage(A1), no tillage with stubbles mulch(A2), no tillage with whole stalks mulch(A3). The secondary treatments include once topdressing Urea(B1) and twice topdressing Urea(B2) under P and K applied with sowing. Analyzed the yields and economic benefit under different fertilization mode of conservation tillage. The results of the experiments showed as follows: There was a close correlation between the achievement of target yield and fertilization mode in the case of fixed amounts of fertilizer , concluded that no tillage with whole stalks mulch mode and twice topdressing urea mode (A3B2) was the optimum combination, and also with highest economic benefit. According to two years experiments, summarized the main points of fertilization management of spring maize under conservation tillage.