施钾对旱地小麦养分变化的影响

Effect of potassium fertilizer application on changes of nutrient in wheat on dry land

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 .

Results of studies on potassium fertilizer application to dry land wheat showed that compared with the soil without potassium application, the utilization rate of nitrogen in the soil with potassium application increased by 3.81%, effectiveness of phosphate and potassium increased by 25.41%, and 8.23%, respectively, and of potassium increased by 20.83%; wheat yield increased by 447.3 kg·hm -2 , the yield increase rate being 8.74%. The marginal utility of potassium fertilizer was 5.204 kg. The best time for applying potassium fertilizer was at boot stage, with an optimum applying quantity of 75 kg·hm -2 .