不同灌溉模式水稻需水规律研究

Experimental Research on Water Consumption Law of Paddy under Different Irrigation Mode

试验研究了浅湿型灌溉、控制灌溉Ⅰ、控制灌溉Ⅱ等3种不同灌溉模式下水稻各生育期需水量、模比系数、需水强度及全生育期腾发过程、产量性状,通过方差分析研究了不同灌溉模式对水稻产量的影响、水分利用率、拟合得到需水量与产量的回归方程。试验结果表明:各灌溉模式需水量及各生育期需水强度均表现为浅湿型灌溉>控制灌溉Ⅱ>控制灌溉Ⅰ,模比系数表明拔节期和抽穗期为需水敏感期,蒸发蒸腾量随温度、灌水情况及生育期变化,不同灌溉模式对产量影响显著,控Ⅱ水分利用率最高,能够达到节水高产的目的。

The experiment studied the water demand, modulus, water requirement intensity, transpiration evaporation process of the whole growth period, yield traits for each growth period under three irrigation modes, i.e. Shallow wet irrigation, controlling irrigation Ⅰ, and controlling irrigation Ⅱ. The effect of different irrigation modes on the rice yield and water use efficiency was studied through the variance analysis and the regression equation for water production and water consumption was obtained through fitting. The results showed that the irrigation water demand and the growth period water demand intensity characterized by shallow wet irri- gation〉controlling irrigation Ⅱ〉controlling irrigation Ⅰ ; the modulus coefficient showed the sensitive period of water demand was jointing stage and heading stage; the evapotranspiration changed with the temperature, water conditions and growth period; different irrigation modes had significant effect on the yield; Controlling Ⅱ could get the highest water use efficiency can achieve the purpose of water saving.