不同施钾量对土壤钾素动态的影响  

Effects of Different Fertilizer Amount on the Dynamics of Soil Potassium

作　　者：陈亚恒[1] 刘会玲[1] 崔江慧[1] 许皞[1] 张毅功[1] 

机构地区：[1]河北农业大学资源与环境科学学院,河北保定071000

出　　处：《河南农业科学》2009年第8期75-77,共3页Journal of Henan Agricultural Sciences

基　　金：河北省"九五"攻关项目(96220913D)

摘　　要：通过定位试验研究了不同钾肥用量情况下土壤钾素的动态变化,结果表明:在完全不施肥或只施用氮、磷肥的情况下,土壤速效钾含量呈现逐年下降趋势,平均每年下降2mg/kg。在施用氮、磷肥的基础上,钾肥用量在112.5kg/hm2(K2O)时可维持土壤钾素原有水平;钾肥用量在225kg/hm2时可提高土壤速效钾含量以及土壤速效钾占土壤全钾的比例,改善土壤钾素状况。The available K in soil is decreasing, which is harmful for the sustainable use of soil po- tassium. Therefore, the change of the soil potassium under different potassium fertilizer amount was studied in this article, which provides basis for the sustainable use of the soil potassium and reasonable fertilizer using. The result indicated that the soil potassium wasdecreased year by year when there was only of nitrogen and phosphorus fertilizer application or non-fertilizer treats. The average annual decrease rate was 2mg/kg every year. The soil potassium maintained the former level when the potash fertilizer amount was 112.5kg/ha. The available potassium increased when the fertilizer amount was 225kg/ha. The proportion of available potassium in the total potassium could also be increased.

关 键 词：施钾量 土壤钾素 动态变化 

分 类 号：S143.3[农业科学—肥料学] S153.6[农业科学—农业基础科学]