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近几年来湖南省在稻田耕作制的改制中,将一部分双季稻制改为春大豆——晚稻(杂交稻),制这一复种制,对提高单产、提高土壤肥力和改良理化性状等方面都有良好效果。本课题具体研究了春大豆在栽培过程中的枯枝落叶和残根对提高土壤肥力的影响。 处理方法:在密度试验(每亩2万、3万、4万株)的三次重复的各小区(每小区面积为0.34亩)铺一块2平方米的地膜,每隔7天收集一次枯枝落叶,烘干称重,收获后扯蔸烘干称根重(仅是残根的一部分),然后分别测定其氮、磷、钾的含量。经测定,春大豆的枯枝落叶含N2.5％,P_2O_50.63％,K_2O3.9％;残根含N0.84％,P_2O_50.2％,K_2O1.1％。其总的结果见下表。
In recent years, Hunan Province has changed some double-cropped rice systems into spring soybeans - late rice (hybrid rice) in the system of paddy farming system reform. In this system, the system of double-cropping has the effect of improving yields, improving soil fertility and improving physical and chemical properties Have a good effect. This project specifically studied the effects of litter and residual roots of spring soybeans on soil fertility in the process of cultivation. Treatment: In a density test (20,000, 30,000, 40,000) of three repeated plots (each plot area of 0.34 acres) shop a 2 square meters of plastic film, litter collected every 7 days , Dried and weighed, dried and weighed, weighed and weighed (only part of the residual root) after harvesting, and then the contents of nitrogen, phosphorus and potassium were measured respectively. It was determined that the litter of spring soybean contained N2.5%, P2O550.63% and K2O3, and the residual root contained N0.84%, P2O550.2% and K2O.1.1%. The overall result is shown in the following table.