Abstract:

Allocating water based on water production function is an important procedure in insufficient irrigation scheduling. The author studied the effect of random fluctuation of sensitivity indexes for different stages of the Jensen model on estimates of crop water consumption. The irrigation experiment data for cotton was used to calculate the water sensitivity indexes and its standard error for different stages in Jensen model. The statistics characteristic value of optimal crop water consumption for different stages was computed through random simulation. The results showed that, the standard errors of yield and the optimal water consumption were considerable. As the restraint of total water consumption was strengthened, the standard errors of yield and optimal water consumption became larger. Consequently, the random fluctuation of the water sensitivity indexes had significant impact on estimates of optimal water consumption. The stronger the restraint of the total water consumption was, the more significant the effects would be.