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选用二种电场强度（44．4V／cm和88．8V／cm）研究20个低丘红壤玉米田间试验的钾释放速率特性，用二级动力学方程来表征，并求得土壤钾释放的速率方程和钾释放的初始速率（v0）等参数。在电场强度为44.4V／cm和88.8V／cm下供试土壤的v0变幅分别在1．17-1．23和1．93-61．58mg／（kg·min）之间，平均值分别为5．36和9．54mg／（kg·min）。统计结果表明：在电场强度为44.4V／cm下，v0与玉米籽粒相对产量、总干物质相对产量、无钾处理玉米吸钾量、土壤速效钾、酸溶性钾和缓效钾6项参比标准之间的相关性均达极显著水平（p=0.01），相关系数分别为0.6275**、0.5645**、0.6624**、0．7277**、0.7843**和0．6299**。而在电场强度为88．SV／cm下，v0除了与玉米总干物质相对产量之间达显著相关水平（P＝0.05，=0．5445*）外，v0与其余5项参比标准之间均达极显著相关水平，相关系数分别为0．6064**，0.7216**，0.7523**，0.8202**和0．6686**。V0能很好地用于评价土壤供钾能力以及钾素肥力诊断指标的划分。
Two fields of field strength (44.4V / cm and 88.8V / cm) were selected to study the potassium release rate characteristics of 20 field hilly red soil maize fields. The second-order kinetic equation was used to characterize the rate of soil potassium release Equation and the initial rate of potassium release (v0) and other parameters. The v0 amplitude of soil tested under electric field strengths of 44.4V / cm and 88.8V / cm were 1.17-1.23 and 1.93-61.58mg / (kg · min), respectively, For 5.36 and 9.54 mg / (kg · min). The statistical results show that the relative yield of v0 and maize grain, the relative yield of total dry matter, potassium uptake by potassium-free treatment, soil available potassium, acid-soluble potassium and slow-release potassium under electric field strength of 44.4V / cm (P = 0.01). The correlation coefficients were 0.6275 **, 0.5645 **, 0.6624 **, 0.7277 **, 0.7843 ** and 0.6299 **, respectively. While the electric field strength is 88. At SV / cm, v0 had significant correlation with the other five reference standards except for the significant correlation between v0 and the relative yield of total maize (P = 0.05, = 0.5445 *), The correlation coefficients were 0.6064 **, 0.7216 **, 0.7523 **, 0.8202 ** and 0.6686 **, respectively. V0 can be used to evaluate the ability of potassium supply in soil and the division of diagnostic index of potassium fertility.