外源腐植酸对灰漠土棉田土壤钾素的影响

为研究腐植酸对棉田土壤钾素动态变化的影响，探讨腐植酸激活石灰性土壤固定态钾素的可行性，选择新疆北部典型灰漠土棉田开展田间小区试验。结果表明，施用腐植酸可降低土壤速效钾含量，提高土壤缓效钾含量，降低土壤全钾含量；腐植酸提高土壤缓效钾含量的作用主要表现在棉花花铃期；与对照相比，施用腐植酸降低了土壤供钾强度，但土壤钾素有效率差异不显著。

Effect of Humic Acids Application on Potassium in Cotton Field of Desert Grey Soil

In order to study effects of humic acids application on the dynamic of potassium,and discuss activated feasibility of fixed soil potassium by using humic acids.The field experiment was conducted on the cotton field of desert grey soil in north Xinjiang.The results showed that: soil available potassium and total potassium were decreased and slowly available potassium was increased after humic acids application.The slowly available potassium was increased,especially in cotton florescence.Besides,compared with CK,the potassium intensity was decreased after using humic acids,but there was not significant difference in potassium efficiency and CK.