Water needs of grapevines in Hawkes Bay Mark Krasnow, Ph.D. - - PowerPoint PPT Presentation

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Sep 27, 2023 38 likes •220 views

Water needs of grapevines in Hawkes Bay Mark Krasnow, Ph.D. Thoughtful Viticulture Ltd. Irrigation optimization research programme in Hawkes Bay Merlot- To purposely induce mild water stress after set to reduce yield and increase

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Water needs of grapevines in Hawke’s Bay

Mark Krasnow, Ph.D. Thoughtful Viticulture Ltd.

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Irrigation optimization research programme in Hawke’s Bay

Merlot-To purposely induce mild water stress after set to reduce yield and increase quality. Chardonnay-Vines only brought to the edge of stress to conserve water, but not lose yield

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October to mid-November Mid-November to December December and January February to mid-April Mid-April to June

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Merlot vineyard #1

15/1/18

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Merlot vineyard #2

30/12/17

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Merlot vineyard #3

4/3/18

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Chardonnay vineyard #1

10/12/17

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Chardonnay vineyard #2

31/12/17

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A sudden interruption in water availability can have mild to catastrophic consequences to vineyards depending on the timing of the interruption, the vine’s canopy size, the weather during the interruption, and the length of the drought.

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Effects of sudden water restriction

n grapevines

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Early effects Late effects

Stomatal closure-Reduced/stopped

photosynthesis. Reserves depleted.

Leaf yellowing-Reduced photosynthesis, even if water becomes available. Reserves depleted Leaf senescence-No photosynthesis

possible. Reserves depleted and no new

reserves made.

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