硫酸钾镁肥对水稻生长、产量和品质的影响

为明确硫酸钾镁肥在水稻上的施用效果,采用大田试验的方法,分别设置5个不同施肥量处理和4个不同施肥时期与分配比例处理,研究了不同硫酸钾镁施用量、施用时期和分配比例对水稻生长、产量和品质的影响。结果表明:硫酸钾镁用量为1023.34 kg/hm2的处理水稻产量、粗蛋白质含量、粗淀粉含量和还原型维生素C含量最高。硫酸钾镁全部基施的水稻,其产量、粗淀粉含量和还原型维生素C含量最高。硫酸钾镁基施50%,拔节期追施20%,抽穗期追施30%的水稻,其粗蛋白质含量最高。从提高产量和改善稻米品质的角度综合考虑,硫酸钾镁的最佳施用量为1 023.34 kg/hm2,最佳施用方法为全部基施。硫酸钾镁基施50%,拔节期追施20%,抽穗期追施30%对改善水稻品质有明显作用。

Effects of Sulphate-potassium Magnesium Application on Growth, Yield and Quality of Rice

In order to know the fertilizer efficiency of sulphate-potassium magnesium in rice,the effects of different applying amount(5 treatments)and period(4 treatments)of sulphate-potassium magnesium on growth,grain yield,and quality of rice were studied using the method of field experiment.The results showed that:the grain yield,crude proteincontent,crude starch content,reduction-type vitamin C content of rice with 1 023.34 kg/ha of sulphate-potassium magnesium application was higher than the other four treatments.The grain yield,crude starch content,reduction-type vitamin C content of rice with all base application of sulphate-potassium magnesium was the maximal.The crude protein content of rice with 50% of base application,20% of applying at the jointing stage,30% of applying at the heading stage was the maximal.The optimal amount of sulphate-potassium magnesium for rice grain yield increasing and quality improving was 1 023.34 kg/ha,and the optimal method of sulphate-potassium magnesium application was at the all base application.The treatment of sulphate-potassium magnesium application with 50% of base applying,20% of applying at the jointing stage 30% of applying at the heading stage,could also significantly improve the rice quality.