Long-term changes in yield and soil fertility in a twenty-year rice-wheat experiment in Nepal

By S. Gami, J. Ladha, H. Pathak, M. Shah, E. Pasuquin, S. Pandey, P. Hobbs, D. Joshy, R. Mishra. Biology and Fertility of Soils, 2001

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Nutrient Uptake and Apparent Balances for Rice-Wheat Sequences. III. Potassium (2006, background): “Several studies have shown, however, that intensive rice-based cropping systems, including rice-wheat (RW) (Timsina and Connor, 2001), may cause heavy depletion of soil K (Tiwari et al., 1985; Dobermann et al., 1996a, 1996b, 1999; Ali et al., 1997; Gami et al., 2001; Regmi et al., 2002; Singh et al.”