Comparison of Different Water Production Functions of Grape with Delayed Planting

In order to explore optimal allocation of irrigation water for delayed cultivation of grape plant，according to data of water consumption and yield relations under water stress treatment under different growth stages of plant in 2013—2014，adaptation of Stewart model，Blank model and Jensen model were analyzed on facilities delayed cultivation of grapes.Water sensitivity index of different growth stages of different growth stages were calculated.Results showed that water sensitivity index of delayed grape was the largest in period of fruit enlargement period，which was a critical period for water demand.Embryonic period was the smallest，and moderate loss of water in this period had a positive effect on yield improvement.Stewart model and Blank model were established as suitable water production function model for delay in facility cultivation of grapes.Under condition of limited irrigation water，it should be taken to bud moderate water deficit，irrigation water to fruit enlargement period of irrigation water allocation，in order to get the best economic benefits in a reasonable deployment of irrigation water.