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高产水稻的灌排技术,必须按照水稻各个生育时期的生理需水和生态需水来确定,以达到以水调肥、调气、调温,促进其正常生长和发育的目的。根据有关单位研究以及我们实践,杂交水稻需水量并不比常规稻多。在整个生育期中需水量最多的是栽秧、孕穗和抽穗开花三个时期。其需水规律大致是:返青期耗水3％,分蘖期22.6％,拔节至孕穗期33.6％,抽穗开花期17.4％,乳熟期17.7％,黄熟期5.7％。其中对水分反应较敏感的是返青期、幼穗发育期、抽穗期和灌浆期。要想获得丰收,就要根据这个特点,再结合各个不同时期的生态需水要求进行合理灌溉。
The technology of irrigation and drainage of high-yielding rice must be determined according to the physiological water requirement and ecological water requirement at each growth stage of rice so as to achieve the purpose of regulating water and regulating temperature and promoting normal growth and development. According to the relevant unit research and our practice, hybrid rice water demand is not more than conventional rice. In the whole growth period of water demand is the most seedling, booting and flowering three stages. The demand of water is roughly: 3% of returning water, 22% of tillering stage, 33.6% of jointing and booting stage, 17.4% of heading and flowering stage, 17.7% of milk stage and 5.7% of yellow stage. One of the more sensitive to the water response is turning green, panicle development, heading and filling stage. In order to obtain a good harvest, we must base on this feature, combined with the ecological needs of different periods of water demand for rational irrigation.