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Description
Water management has long been recognized as having a significant influence on both yield and quality components of winegrapes. Winegrapes differ from other perennial crops in that water management is commonly used as a tool to influence fruit maturation and must composition. Conventional estimation of perennial crop water use relies on reference evapotranspiration (ET 0) and crop coefficients (K), which varies with growth stage. For winegrapes, this approach over-estimates vine water use required for maximum crop performance. The practice of inducing water deficits requires an innovative approach to estimating vine water use. Proposed is the use of a term accounting for the severity and timing of water deficits called performance coefficient (K ) in addition to the use ofboth ET 0's and K's. K values, Pdetermined experimentally, vary from 1.0 iii early season to 0.30 near harvest. Once sufficient water use is estimated, a simple-to-use, non-computer volume balance method of irrigation scheduling is suggested. This method balances sufficient water use with available soil stored moisture, in-season rainfall and irrigation.
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