国产和进口阳离子交换树脂膜埋置法测定土壤中的有效钾

ASSESSING AVAILABLE SOIL POTASSIUM BY CATION EXCHANGE RESIN MEMBRANE

采用 2 0个来自中国各地的土壤样品 ,研究了进口和国产阳离子交换树脂膜埋置法测定土壤中的有效钾的技术 ,结果表明阳离子交换树脂膜埋置法测定土壤有效钾的最佳埋置时间为 2 0min。树脂膜法测定的土壤钾值与中性醋酸铵法测定的土壤有效钾之间具有极显著的相关性 ,进口树脂膜的测定值与中性醋酸铵法测定值间的相关性稍优于国产树脂膜。中性醋酸铵法和树脂膜法测定的土壤钾与植物实际吸钾量间具有极显著的相关性 ,树脂膜法测定值与植物实际吸钾量间的相关性明显优于中性醋酸铵法 。

Export and Chinese cation-exchange membrane (CEM) were used to assess available soil K with 20 soil samples from several regions in China by burial method The results showed that the best burial period was 20 minutes The soil K tested by CEM was significantly correlated with that tested by the conventional chemical method (1 0 mol L -1 ammonium acetate) (r 2=0 701,0 725) The soil K tested by export CEM was more closely correlated with ammonium acetate method than Chinese CEM Potassium uptake by plants was significantly correlated and ammonium acetate extractable K Potassium uptake by plants was more closely correlated with CEM extractable K than the conventional method Export CEM method was slightly better than the Chinese CEM method for testing soil available K