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用常规分析、钾的容量强度(Q/I)关系和电超滤(EUF)等法研究了安徽烟区黄红壤、黄棕壤和砂姜黑土的供钾特性。结果表明:粘粒矿物以高岭石、水云母为主的黄红壤有较高的供钾强度及速效钾数量,但土壤的供钾潜力及钾位缓冲容量PBC~k较低,固钾能力弱。粘粒矿物以水云母、蒙脱石为主的黄棕壤及以蒙脱石、水云母为主的砂姜黑土的供钾特性与黄红壤相反,其中砂姜黑土除固钾能力高于黄棕壤外,其他供钾指标略低于黄棕壤。土壤的供钾特性对烟草的吸钾量及钾肥肥效有直接影响。
The potassium supply characteristics of yellow-red soil, yellow-brown soil and saprolium-black soil in Anhui tobacco area were studied by routine analysis, Q / I relationship and electrofiltration (EUF). The results showed that clay and kaolinite-based yellow-red soil had higher potassium supply and available potassium, but potassium supply potentials and potassium buffer capacity PBC-k were lower, weak. Karst clay mineral water-based mica, montmorillonite yellow brown earth and montmorillonite, aqua mica-based Shajiang black soil potassium characteristics and yellow-red soil, in which Shajiang black soil potassium removal capacity is higher than the yellow Brown brown soil, other potassium indicators slightly lower than yellow brown soil. The potassium supply characteristics of soil have a direct impact on the amount of potassium absorbed and the fertilizer efficiency of tobacco.