Abstract
This study aims to determine the effect of organic fertilizer on kinetics of potassium release and uptake and to find the best kinetic models describing K release from soils. The treatments included control, inorganic fertilizer, 10 ton/ha cow manure, 5 ton·ha−1 green manure, and 7.5 ton·ha−1 cow + green manure (2:1). The experiment was analyzed using RCBD with three replications. The kinetics of non-exchangeable K release was extracted with 0.01 M CaCl2for 2hto 168 h and data of K release were fitted to five mathematical models: zero-order reaction, first-order reaction, power function equation, parabolic diffusion and Elovich equation. The results showed that plant and root-K uptake from control, inorganic fertilizer, cow manure, green manure and cow + green manure were respectively 45.16; 62.33; 61.46; 55.66; 68.89 mg/clump and 15.63; 23.09; 44.91; 17.53; 23.41 mg/clump. The treatments were not significant on plant uptake, root uptake and K release so organic fertilizer can be used to replace inorganic fertilizer application. Among the five equations, power function best described the K release pattern with R-square was 0.50. The constant b, an index of K release rate, ranged from 0.003 to 0.018 ppm·h−1 in the power function model.
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