Effect of crop diversification of rice-wheat cropping system on productivity and profitability
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Abstract
Rice-wheat cropping system, being considered back bone of food self-sufficiency in many Asian countries, is facing sustainability problem and a need of crop diversification of this system is felt in recent years. A field study conducted for two years (1995-96 and 1996-97) at the Indian Agricultural Research Institute, New Delhi on a sandy clay loam soil indicated that partial diversification by inclusion of mungbean during summer (May-June) in rice-wheat system resulted in an increase in productivity and profitability. However, highest productivity was achieved when wheat was replaced by potato (followed by mungbean in summer) and highest profitability was achieved when wheat was replaced by clover. Rice-potato-mungbean cropping system increased productivity over rice-wheat system by 5.1 t ha(-1) yr(-1) and profitability by US $429 ha(-1) yr(-1). Similarly, rice-clover-cropping system gave 3.3 t ha(-1) yr(-1) higher productivity and US