Effect of organic fertilizer on kinetics of potassium release and rice uptake in inceptisols Kalitirto, Sleman

International Conference on Organic Agriculture in the Tropics: State of the Art, Challenges and Opportunities

Himawati, S.^1 ; Purwanto, B.H.^1 ; Utami, S.N.H.^1

Department of Soil Science, UniversitasGadjahMada, Jl. Flora Bulaksumur, Yogyakarta, Indonesia^1

关键词: Elovich equations;    First order reactions;    Inorganic fertilizers;    Kinetic models;    Organic fertilizers;    Potassium release;    Power functions;    Release pattern;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/215/1/012031/pdf
DOI  :  10.1088/1755-1315/215/1/012031

来源: IOP

【 摘 要 】

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.