Abstract
Abstract The 1st year performance of ‘Vidal Blanc’ and ‘Chancellor’ European-American grape cultivars was evaluated in a drought year. The most favorable treatment on plant water relations and vine growth was soil profile modification with irrigation (MI), followed by no soil profile modification with irrigation (Cl), soil profile modification without irrigation (MN), and no soil profile modification without irrigation (CN). Leaf conductance (kl), transpiration, vine height, leaf number, average leaf area, and total estimated leaf area were increased 2 to 7 times with irrigation. ‘Vidal Blanc’ seems to be better adapted than ‘Chancellor’ to low soil moisture conditions. Irrigation was consistently more beneficial than soil profile modification in the establishment year.
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