水稻间歇灌溉的节水增产机理研究

使稻田水分处于“薄水层─湿润─短暂落干”循环状态的水稻间歇灌溉是我国应推广的水稻节水灌溉技术之一。依据近三年来的试验研究，讨论了间歇灌溉的节水和增产机理，提出了着眼于提高降水利用率和降低渗漏量的稻田水管理模式及其注意事项；同时认为水稻间歇灌溉有利于提高氮素养分的利用率，从而促进水稻增产。

Mechanism of Water-saving and Yield-raising of the Intermittent Submerged Irrigation for Rice

One of the most efficient water-saving practice for rice production is the intermittent submerged irrigation technique which alternates wetting and drying the paddy field. Based on the irrigation experimental data during three years, the mechanism of both water-saving and yield-raising of the intermittent submerged irrigation for rice and suggests the precipitation should be fully utilized and unnecessary percolation eliminated to save irrigation water. The rice yields with different irrigation techniques imply that the intermittent submerged irrigation be advantageous to absorbing nitrogen and transferring nitrogen to the plant-growing center and increase yields of rice.