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通过钾的等温吸附与解吸试验，研究了江西省主要红壤旱地土壤吸附钾与解吸钾之间的内在联系。旱地土壤对钾的吸附特性以Ｆｒｃｕｎｄｌｉｃｈ等温吸附方程最为吻合；黄泥土的钾吸附特征曲线是较急剧上升型，其余土壤曲线平缓，最大吸钾量的顺序依次为黄泥土＞鳝泥土＞麻砂泥土＞红砂泥上＞花岗岩黄壤土；吸附钾的解吸率在５１．７％～９６．６％之间，平均解吸率分别为５３．５％、５８．８％、８８．５％、７０．２％、９５．３％。因此施用等钾量时后者容易显效，而且优于前者，但容易发生淋溶，需钾更迫切。
Through the isothermal adsorption and desorption experiments of potassium, the interrelation between the adsorption of potassium and the desorption of potassium in the soil of the main red soil in Jiangxi Province was studied. The adsorption characteristics of potassium in dryland soil are the most consistent with Frcundlich isothermal adsorption equation; the potassium adsorption characteristic curve of yellow soil is more steeply rising type, the rest of soil curve is gentle, and the order of maximum potassium uptake is yellow soil> eel soil> > Red sand> yellow granite soil. The desorption rate of adsorbed potassium ranged from 51.7% to 96.6%. The average desorption rates were 53.5%, 58.8% and 88.5%, respectively. 2%, 95.3%. Therefore, when the other potassium dosage is easy to be effective, and better than the former, but prone to leaching, more urgent need of potassium.