Crop Diversification How much water does corn require, and how much do soybeans need? Experts suggest corn requires 500-800 millimeters and that the crop needs limited water at least three times during the crop season. These periods of hydration need to occur at the time of sowing, within 20-40 days of sowing and within 45-60 days of sowing. Soybeans require about the same amount of water. Paddy, however, requires 900-2,500 millimeters of water during its crop cycle and must be submerged in at least 30-100 millimeters at different times. Water use efficiency (WUE) for paddy is 3.7 per millimeter of water when productivity is 4.5 MMT, whereas WUE for corn is 8 per millimeter of water when productivity is 5 MMT.The government of India (GOI...