潮土褐土的供钾特性及小麦施钾效应

采取吸附试验、盆栽试验和田间试验方法，对潮土和褐土的供钾特性及钾肥肥效进行了研究。结果表明：（1）潮土的固钾能力远高于褐土，其土壤速效钾和缓效钾释放量和释放速率不及褐土，供钾能力相对较弱。（2）潮土施钾效果明显优于褐土，钾肥利用率相对较高，即每施入1公斤K2O，潮上增产小麦5．8kg，揭土增产小麦4．1kg。因此，生产上应将有限的钾肥资源优先分配到施钾效果明显的潮土上。

Potassium-supplying Characters and the Application Effect of Potassium Fertilizer on Wheat for Chao and Cinnamon Soils

Potassium-supplying characters and the effect of potassium fertilizer for Chao and Cinnamonsoils were studied with adsorption method, pot cultivation and field trials. Results indicated that: (1)Potassium fixation ability of Chao soil is much greater than that of Cinnamon soil, and releasing amountand rate of rapidly and slowly available potassium of it are lower than that of Cinnamon soil. Potassiumsupplying ability of Chao soil is relatively lower than that of Cinnamon soil; (2)Application effect of poatssium fertilizer on Chao soil is obviously better than that of Cinnamon soil, and hence potassium utilizationcoefficient on Chao soil is relatively high, that is, grain yield increase per kilogram of K2O for wheat is5. 8kg on Chao soil and 4.1kg on Cinnamon respectively. Therefore the limited potassium resource is proposed to be given to Chao soil rather than Cinnamon soil.