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旱地小麦施用钾肥研究结果表明 ,施钾较不施钾的土壤氮素利用率提高 3 81% ,磷素有效性提高 2 5 4 1% ,钾素有效性提高 8 2 3% ,钾素贮量增加 2 0 83% ;小麦增产 4 4 7 3kg·hm-2 ,增产率为 8 74 % .钾肥边际效应为 5 2 0 4kg .小麦孕穗期追施钾肥效果较好 ,用量 75kg·hm-2 为宜 .
The results of potash application in dryland wheat showed that the utilization of potassium in soil increased by 3 81%, the availability of phosphorus increased by 2541%, the availability of potassium increased by 8 2 3% Increased 2083%; wheat increased 4774kg · hm-2 and the yield increased by 8 74% .The marginal effect of potash was 5220kg.The effect of topdressing potassium on booting stage of wheat was better with 75kg · hm-2 Should