水稻是喜水作物,其需水量可分为两部分:一是生理需水,二是生态需水。生理需水也叫蒸腾需水,它是水稻正常生理活动及保持植株体内水分平衡所需要的水分。诸如组成稻体体型、进行光合作用、吸收和输送养分等生理上必不可少的需水。这部分水量实际并不太多,也不比其它谷类作物需水量大,一般每亩地只要200～300方即可 Rice is a water-like crop, its water demand can be divided into two parts: First, physiological water needs, and second, ecological water needs. Physiological water, also known as transpiration water, is the water required for the normal physiological activities of rice and for the maintenance of plant body water balance. Such as physiologically indispensable needs of water, such as the formation of a rice body, photosynthesis, absorption and transport of nutrients. This part of the actual amount of water is not too much, nor more than other cereal crops water demand, generally only 200 to 300 square meters per mu