
TY  - JOUR
A1  - Singh, Muneshwar 
A1  - Tripathi, A. K. 
A1  - Reddy, D. Damodar 
T1  - Potassium balance and release kinetics of non-exchangeable K in a Typic Haplustert as influenced by cattle manure application under a soybean-wheat system
JF  - Soil Research
JO  - Soil Res.
Y1  - 2002
VL  - 40
IS  - 3
SP  - 533
EP  - 541
KW  - K balance, non-exchangeable K release kinetics, soybean-wheat rotation, cattle manure, Typic Haplustert.
UR  - https://doi.org/10.1071/SR00064 
N2  - 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. 
ER  -

