冬小麦-夏玉米轮作中长期定位施肥的土壤钾素变化研究

基于25年的长期定位试验, 研究了非石灰性潮土区冬小麦—夏玉米轮作中长期定位施肥的土壤钾素变化。结果表明, 单施有机肥及有机肥配施无机氮肥, 都能明显提高土壤缓效钾的含量; 无机钾肥与氮肥配施能显著提高水溶态钾的含量。土壤速效钾与全钾呈显著正相关, 与土壤缓效钾、交换态钾呈极显著正相关。单施氮肥的土壤, 速效钾、缓效钾含量均降低, 全钾含量变化不明显。

Study of Soil Potassium Changes to Long-term Located Fertilization in Winter Wheat-summer Corn Rotation

This experiment was done in the 25 years fixed position e xperiment of non-calcareous fluro-aquic soil.The potassium changes of the non -calcareous fluro-aquic soil to long-term located fertilization in winter whe at-summer corn rotation were studied.The results indicated that:Both mono-app lication of organic fertilizer and combined application of organic fertilizer an d inorganic nitrogen fertilizer can improve the soil content of slow-release po tassium significantly;Combined application of inorganic potassium fertilizer and nitrogen fertilizer can also improve the content of soluble potassium sharply;S oil content of available potassium was positively related to the total potassium ,significantly positively related to soil slow-release potassium and exchangeab le potassium;Available potassium and slow-released potassium contents were decr eased,and total potassium content was changed insignificantly in the soil of mon o-application of nitrogen fertilizer.