Abstract
Abstract Some aspects of senescence and bud hardiness of young ‘Vidal blanc’ and ‘Chancellor’ French-American grapevines in the following treatments were evaluated: soil profile modification plus irrigation (MI), no soil profile modification plus irrigation (Cl), soil profile modification without irrigation (MN), and no soil profile modification without irrigation (CN). After a prolonged summer drought, abundant fall precipitation increased 25 Oct. chlorophyll and leaf N levels for nonirrigated vines. In contrast, leaf P and K were higher for irrigated treatments. Bud hardiness of ‘Chancellor’ was greater than ‘Vidal blanc’ for all except the Cl treatment. Maximum primary bud hardiness was achieved in the Cl and MN treatment for ‘Vidal blanc’ and ‘Chancellor’, respectively. Cambium damage and/or plant death occurred for only ‘Vidal blanc’ in the CN treatment.
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