Abstract
‘Marsh’ ( Citrus paradisi Macf.) grapefruit trees on rough lemon ( C. jambhiri Lush.) rootstock received irrigated and unirrigated treatments. Half of each irrigation treatment received a GA 3 + 2,4-D spray at color break. Pre-harvest sprays of GA 3 and 2,4-D extended the grapefruit harvest season by increasing fruit removal and rind puncture force, delaying development of mature color and decreasing late-season and post-freeze fruit-drop. Although soil moisture content in the top 0.9 m of unirrigated blocks was reduced by approximately 40%, xylem pressure potentials of these trees and performance of GA 3 + 2,4-D were unaffected. Soil moisture content was not an accurate indicator of tree water status for large grapefruit trees.
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