洞庭湖区潮泥田晚稻施用钾镁硫肥的肥效研究初报

The Fertilizer Efficiency of Applying K, Mg and S Fertilizer to Field with Alluvial Mud Soil in Dongting Lake Area

为科学指导K、Mg、S肥的施用,在洞庭湖区潮泥田上,进行了晚稻施用KCl、MgSO4肥的肥效试验。研究结果表明：在地力产量为369.95kg/667m2情况下,施用N、P肥的基础上,单施不同量K肥,稻谷可增产16.5%-24.2%,增产效果明显;单施不单施不同用量MgSO4肥,稻谷可增产5.8%-6.9%。在施用N、P肥和不同用量K肥的基础上,再增施不同用量MgSO4肥,稻谷可增产7.0%-8.6%和10.2%-10.3%,说明增施K肥有利于提高MgSO4肥的肥效。

In order to guide the application of fertilizers of K, Mg and S scientifically, the fertilizer efficiency experiments of KCI fertilizer and MgSO4 fertilizer were conducted in late rice. The results showed that when land fertility was 24.67 kg/hm2 and on the basis of applying fertilizers of N and P, then compound applying K fertilizer with different amounts, the yield of rice could increase 16.5%-24.2%, which means the increasing effect was obviously; then, compound applying MgSO4 fertilizer with different amounts, the yield of rice could increase 5.8%-6.9%. On the basis of applying fertilizers of N and P or applying different amounts of K fertilizer, then applying different amounts MgSO4 fertilizer, the yield of rice could increase 7.0%-8.6% or 10.2%-10.3%, respectively, which indicated that applying K fertilizer is propitious to increase the fertilizer efficiency of MgSO4 fertilizer.