Simulation of soil water content and irrigation amount under different irrigation schemes

In order to understand the effects of irrigation schemes on soil water content and irrigation amount,a soil water probability model was employed to simulate the characteristics of soil water probabilistic distribution and the changes of average soil water content under traditional and continuous irrigation. The results indicated that there was a significant distinction of soil water probabilistic distribution for different irrigation schemes,and the maximum value of probability density function of soil water appeared at s = s*for continuous irrigation,but s = sfcfor traditional irrigation. Compared to traditional irrigation,continuous irrigation kept the soil water content at a lower level,thus reducing leakage losses and surface runoff by storing more water into the soil when rainfall happened. Therefore,continuous irrigation could significantly increase the use efficiency of agricultural water resources by improving the utilization rate of rainwater and reducing the amount of irrigation water.