灌溉是农作物增产的重要措施之一,长江流域的水稻田,数千年来就有灌溉习惯,但如何达到“丯产而又省水”这一目的,若干地区尚缺乏系统的资料进行分析研究。在旱作物方面,如棉花、玉米、小麦的种植,虽然本流域雨量充沛,但一般没有灌溉习惯,同时流域内降雨量的分配并不很均匀,伏旱、秋旱常有出现,因而旱作物是否需要灌溉,也急待研究。 Irrigation is one of the important measures for increasing crop yield. The paddy fields in the Yangtze River Basin have been used for irrigation for thousands of years. However, how to achieve the goal of “hydroponics and water saving” is still lacking in systematic analysis and research in some areas . In the case of dry crops, such as cotton, corn and wheat, although there are abundant rainfall in this basin, there is generally no irrigation habit and the distribution of rainfall in the basin is not very uniform. Whether the need for irrigation, but also urgent study.