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在农业生产中,种植水稻耗水量极大。据试验,生产1吨稻谷约需耗水2000吨左右。国外推广的节水种稻新技术,主要采取以下措施。1.水田育种所谓水田育种,就是将未发芽的稻种浸泡24小时后直接播种至稻田,稻田要保持水淹25～30天。这种方法比传统的先育苗后移栽法要节水20%～25%,且可节省劳力。2.间歇灌溉就是一次灌溉以后,在一定时间内中断灌溉,直至稻田土块即将干裂时进行再次灌溉。这种间歇性灌溉方法一直持续到水稻成熟和收获,一般可节水30%～40%。
In agricultural production, water consumption is very high. According to the test, about 1 ton of paddy will consume about 2,000 tons of water. The new technology of water-saving rice cultivation in foreign countries mainly adopts the following measures. 1. Paddy field breeding The so-called paddy field breeding, that is, non-germinating rice soaked 24 hours after sowing directly to the paddy fields, paddy fields to maintain flooded 25 to 30 days. This method is 20% ~ 25% water saving than the traditional method of transplanting before raising seedlings, and can save labor. 2. Intermittent irrigation is a period of irrigation after the irrigation is interrupted for a certain period of time, until the paddy soil block is about to dry again when irrigation. This intermittent irrigation continues until the rice is ripened and harvested, saving 30% to 40%.