Researches on cropping system of farm crops based on water saving and benefit raising

In order to search for water saving and benefit raising technology for farm crops,comparative tests on 4 factors are performed with regard to the main 3 kinds of cropping systems of Hunan Province,that is,rice and corn,watermelon and rice,and tobacco and rice.The test results show that based on the optimal strategy of water consumption,output value and net income,the best cropping system is the combination of watermelon and rice,the second is tobacco and rice,and the last is rice and corn.