Rapid changes have taken in crop-rotation after Green Revolution. This is due to the increase in productivity in areas affected by Green Revolution (Punjab, Haryana and H.P.). Agricultural productivity has decreased in the traditional rice producing areas of the East. Besides this, the agricultural development, in Green revolution affected areas, has become stagnant. To meet these problems, the farmers have adopted new systems of crop rotation in different areas. For example, Punjab has adopted a Wheat-Rice rotation system, and U.P. has taken to Wheat-Sugarcane crop-rotation system.