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水稻的生理需水、生态需水主要来源于人工灌溉和自然降水.在保证水稻正常生育需水的情况下,灌溉用水越少,所取得的经济效益就越高.水稻灌溉用水量的大小主要取决于水稻生长季的自然降水量大小及时间分配.在掌握历年水稻各生育阶段自然降水量和当年气候预报的基础上,就比较容易做到按计划定量灌溉.从而大幅度降低生产成本,增加经济效益.水稻生理需水量与旱地禾谷类作物及豆科作物大致相同,当土壤湿度
The physiological water demand and ecological water demand of rice mainly come from artificial irrigation and natural precipitation, and the less economic water is needed when the water needs to be irrigated to ensure the normal fertility of rice.In this paper, Depending on the size and timing of the natural precipitation during the growing season of rice and grasping the natural rainfall at various growth stages of rice over the years and the climate forecast of the year, it is easier to plan and rationally irrigate it, thus greatly reducing the production cost and increasing Economic Benefits: The physiological water requirement of rice is roughly the same as that of dry land cereals and leguminous crops. When soil moisture