| This experiment studied the effect of water regulate and control on water consumption regularity, yield and quality of wine grape (Merlot, 13 a) under drip irrigation. The results showed that water consumption intensity in berry growth period reached 2.64～3.66 mm·d-1, the water consumption modulus accounted more than 50%. Meanwhile, the yield reduced 61.2% and water use efficiency dropped 38.5% in this period, the total sugar and soluble solids content lessened, and the titratable acid content rised under deficit irrigation in this period. In new shoot growing period and flowering fruit-set period, the severe water deficit had little influence on yield, and the water use efficiency can be increased 10%. While in berry maturity period, the severe water deficit could enhanced the total sugar and soluble solids content, reduced the titratable acid content. But the yield reduced 44.7%, the water use efficiency can be dropped 23%. Through the comprehenve analysis, it was the optimal water regulating and controlling model for increasing wine grape yield and water use efficiency, and improving fruit qualities as severe water deficit in new shoot growing period and flowering fruit-set period, full water supply in berry growth period, and moderate water deficit in berry maturity period. |