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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．
Potassium Q / I characterization is an important indicator of soil potassium status, it can simultaneously measure the strength and capacity of soil potassium. In this paper, the relationship between Q / I characteristics of paddy soil with different texture and application technology of field potash fertilizer in Guangdong Province was studied. The results show that: (1) The Q / 1 curves of soils with different textures are obviously different, and the sand type curves are more gentle. Clay curve is steeper. (2) There was a significant positive correlation between PBCk and soil clay content (r = 0.653). (3) - △ K0 was significantly and positively correlated with the relative crop yield (r = 0.873), which could be used as a parameter to predict the amount of potassium required for the crop. (4) There was a significant negative correlation between AR_e ~ k and soil clay content (r = -0.520). The size of AR_e ~ k can be used as a basis for rational allocation of potash fertilizer.