The relation between irrigation water use and water conservancy input of farmland irrigation of 12 provinces in China from 2003 to 2005 is analyzed with CES production function and panel data. Empirical results show that there is great elasticity of substitution between irrigation water use per mu and water conservancy input of farmland irrigation. The substitute relation is strong, which means that, under a given output level, government departments could encourage various investment channels to increase the input level of rural public goods so that substitute water conservancy input for irri...
