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水是植物体内的重要组成部分,平均占作物重量的60—80%,1棵玉米一生需水400～600斤。生产1斤小麦需水1,000～1,500斤。农作物从种到收,消耗于地面蒸发和叶面蒸发的水量叫需水量。作物在整个生育期内,一般情况是前期需水少。中期多,后期又少。
Water is an important part of the plant body, accounting for an average of 60-80% of the crop weight, a corn water needs 400 to 600 pounds. Produce 1 kg of wheat water 1,000 to 1,500 pounds. Crops from harvest to harvest, consumed in the ground evaporation and leaf water evaporation called the amount of water required. Crops throughout the growth period, the general situation is less water demand. Mid-term, late and less.