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Leaf Water Potentials for Management of High Frequency Irrigation on Apples
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1984
Year
EngineeringWater StressForestryAgricultural EconomicsPlant PathologyHigh Frequency IrrigationPlant Water StatusEarth ScienceLeaf Water PotentialsAgricultural Water ManagementWater StatusSustainable AgriculturePublic HealthHorticultural ScienceCrop Water RelationIrrigationNj^ SiteDroughtTree GrowthPlant Physiology
ABSTRACT LEAF water potentials {yjj offer a reliable means to evaluate the water status of apple trees if the values are adjusted to compensate for diurnal and daily changes associated with weather changes. A strong linear relationship suitable for field use has been found to predict \p^ from a known atmospheric vapor density gradient (Ap^J where stomatal conductance is high for both nondeficit and deficit irrigated trees. The slopes of linear equations for trees grown under nondeficit and deficit irrigation regimes differ significantly which indicates that conventional predawn measurements of nj^ Site not adequate for establishing the plant water status of apples. This relationship appears to be independent of the type of irrigation system.