Results of a long-term rice-wheat soil fertility experiment in the Terai of Nepal
1994
Giri, G.S. | Acharya, G.P. | Regmi, A.P. (National Wheat Research Program (NWRP), Bhairahawa (Nepal)) | Hobbs, P.R. (Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Kathmandu (Nepal). Wheat Program)
A long-term rice-rice-wheat cropping pattern trial was initiated at the National Wheat Research Centre at Bhairahawa in the Terai of Nepal in 1978. The experiment started with the normal or second rice crop and has received the same treatments for the two rice crops and the one wheat crop annually since that date. Nine fertilizer treatments allowed the experiment to look at the effect P and K in factorial combination, the effect of applying P and K to just wheat and measuring the residual carryover to the two rice crops, the residual effect of incorporating crop stubbles, and the effect of applying farmyard manure only. Results showed a distinct decline in yield for both rice crops for all treatments with minus P plots being affected more drastically than two plus-P treatments. One hypothesis for the decline in rice yields even where N-P-K is applied in the reduction in available zinc to bellow critical levels. This could have alarming implications for food production in the region if the results of this experiment can be verified in farmers' fields and other areas of South Asia
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