
%0 Journal Article
%A Singh, Muneshwar 
%A Tripathi, A. K. 
%A Reddy, D. Damodar 
%T Potassium balance and release kinetics of non-exchangeable K in a Typic Haplustert as influenced by cattle manure application under a soybean-wheat system
%J Soil Research
%D 2002/05/03
%V 40
%N 3
%P 533-541
%K K balance, non-exchangeable K release kinetics, soybean-wheat rotation, cattle manure, Typic Haplustert.
%R https://doi.org/10.1071/SR00064
%U https://www.publish.csiro.au/paper/SR00064 
%X Potassium balance and non-exchangeable potassium release in 0.01 M CaCl2 medium in a Typic Haplustert were studied in a 7-year-old soybean&#8211;wheat rotational experiment involving 4 levels of cattle manure along with the recommended dose of K (66 kg&sol;ha.year). Continuous cropping without returning crop residues to the soil led to a negative balance of 66&#8211;107 kg K&sol;ha.year. Manuring at the rate of 4 and 8 t&sol;ha did not significantly change the negative balance, but application of 16 t&sol;ha manure reduced the negative K balance. Continuous cropping without cattle manure reduced cumulative K release from 236 mg&sol;kg (initial) to 195 mg&sol;kg. Application of manure at 4, 8, and 16 t&sol;ha kept K release at 229, 245, and 246 mg&sol;kg soil, respectively. A parabolic diffusion equation was the best fit to describe K release. Cropping under the present level of K input resulted in a decline in non-exchangeable K whatever the addition of manure. Manuring at 4 and 8 t&sol;ha has accelerated the mining of native K, which increased the unsustainability of the system. K balance, non-exchangeable K release kinetics, soybean&#8211;wheat rotation, cattle manure, Typic Haplustert. 
