摘要
钾素Ｑ／Ｉ特性是表征土壤钾素状况的一个重要指标，它能同时度量土壤钾素的强度和容量．本文研究了广东不同质地水稻土Ｑ／Ｉ特性与大田钾肥施用技术的关系．结果表明：（１）不同质地土壤的Ｑ／１曲线差异明显，砂土类曲线较平缓．粘土类曲线较陡。（２）ＰＢＣｋ与土壤粘粒含量呈极显著正相关（ｒ＝０．６５３）．（３）－△Ｋ０与作物相对百分产量呈极显著正相关（ｒ＝０．８７３），可作为预测当季作物需钾量的参数．（４）ＡＲ＿ｅ￣ｋ与土壤粘粒含量呈显著负相关（ｒ＝－０．５２０），ＡＲ＿ｅ￣ｋ的大小可作为钾肥合理分配的依据．
Q/I characteristics of potassium are important index to indicate soil potassium status, which is able to show both the intensity and quantity of soil K at the same time. This paper deals with the Q/I characteristics of potassium of paddy soil with different texture in Guangdong province. The results show that: i) The soils with different clay contents present different Q/I curves. ii) Soil K potential of buffering capacity (PBCk) is significantly correlated with clay content of soil (r=0. 653). iii) -△K0 is significantly correlated with the relative percentage of rich grain yield (r=0.873).iiii) AR_e￣k is negatively correlated with clay content of soil (r=0.520).
基金
广东省科委"八五"攻关项目
关键词
水稻土
钾肥
钾
交换性钾
活性钾
粘粒含量
Q/I curve, K potential buffering capacity, exchangeable K, liable K,clay content, relative percentage of yield
