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Rice-Wheat cropping system covers about 11 m ha in India, is the backbone of India's food security. This cropping system produces as high as 12.8 to 17.0 t/ha/annum at different levels of cultivation and is highly nutrient depleting but the factors responsible for success of this system are good economic return, market infrastructural support and very little risk making increasingly popular with the farmers over the years. The introduction of the non-sensitive, input responsive, relatively early maturing varieties of rice and wheat in the mid 60's enabled farmers to intensify land use and...