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| DOI： |
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| Effects of Regulated Deficit Irrigation on Wine Grape Water Consumption Characteristics and Water Production Function |
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KONG Weiping, YU Shengzhi, WANG Haifeng, HUANG Tao, HOU Yun, TANG Li, ZHANG Qi, LIU Yan, CHENG Ziyong
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Water Supplies Bureau, Yumen 735200, China; School of Engineering, Gansu Agricultural University, Lanzhou 730070, China
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| Abstract: |
| To determine the wine grape water production function, the experiment was performed by using water deficit irrigation in different growth periods of wine grape to research the effects of soil water conditions on water consumption and yield at different growth period of wine grape, the field soil water content, water consumption, yield and water use efficiency with drip irrigation were studied, and Merlot was used as test material. The results showed that the effects of soil water deficit on yield were related with growth periods of wine grapes. The effect of water deficit at the berry enlargement period was the largest on yield, and then followed by florescence period, coloring maturity period and pumping vine period, and germination period. Comparing the Blank model with Jensen model, it was concluded that Jensen model was more reasonable. Then the water sensitivity index was calculated by the Jensen model. The order was berry enlargement period＞florescence period＞coloring maturity period＞pumping vine period＞germination period, which was similar to the water consumption. Maintaining soil moisture between 60%～65% of field water capacity would not reduce the yield at germination period, pumping vine period and coloring maturity period, and well watered at berry enlargement period would get high yield with good water use efficiency. |
| Key words: regulated deficit irrigation; wine grape; water consumption characteristics; water production function |
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