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Article

Interactions of Crop Level and Late Season Water Stress on Growth and Physiology of Field-Grown Concord Grapevines

Stefano Poni, Alan N. Lakso, James R. Turner, Richard E. Melious
Am J Enol Vitic.  1994  45: 252-258  ; DOI: 10.5344/ajev.1994.45.2.252
Stefano Poni
Dipartimento di Colture Arboree, Università di Bologna, Via Filippo Re, 6, 40126 Bologna, Italy
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Alan N. Lakso
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James R. Turner
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Richard E. Melious
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Abstract

The effects and interactions of late season soil water deficit and crop level on the growth, yield, fruit quality, and physiology of four-year-old Concord own-rooted grapevines in a loam soil in New York were examined. Soil moisture stress was induced in half of the vines by rain-shielding beginning after bloom, while natural and supplemental drip irrigation were used to maintain high water status of the other half. Within each stress plot crop levels were adjusted to give unthinned vines with a mean of 130 clusters/kg pruning weight versus 67 clusters/kg pruning weight giving about 18 and 9 t/ha, respectively. Thinning of the crop significantly decreased cluster number and yield, but increased shoot growth, juice °Brix, and pruning weights as expected. Since significant soil water stress did not developed until about 10 to 20 days after veraison, the stress only significantly reduced net photosynthesis (Pn) and leaf conductance (gl) after veraison at leaf and pre-dawn soil water potential below -1.1 and -0.25 MPa. A significant water stress x crop level interaction occurred at harvest for juice °Brix and total soluble solids (TSS) per berry, indicating that reduction of sugar accumulation due to water stress was aggravated in heavier cropping vines. No significant effects of crop level on leaf gas exchange or vine water use (i.e., soil water reduction in shielded plots) were observed. The reduction of leaf function and earlier leaf senescence in the unthinned stressed vines were not severe enough to cause carry-over effects the following season.

  • Vitis vinifera L.
  • crop level
  • water stress
  • photosynthesis
  • berry growth
  • berry ripening
  • Received November 1992.
  • Copyright 1994 by the American Society for Enology and Viticulture

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Interactions of Crop Level and Late Season Water Stress on Growth and Physiology of Field-Grown Concord Grapevines
Stefano Poni, Alan N. Lakso, James R. Turner, Richard E. Melious
Am J Enol Vitic.  1994  45: 252-258  ; DOI: 10.5344/ajev.1994.45.2.252
Stefano Poni
Dipartimento di Colture Arboree, Università di Bologna, Via Filippo Re, 6, 40126 Bologna, Italy
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Alan N. Lakso
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James R. Turner
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Richard E. Melious
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Interactions of Crop Level and Late Season Water Stress on Growth and Physiology of Field-Grown Concord Grapevines
Stefano Poni, Alan N. Lakso, James R. Turner, Richard E. Melious
Am J Enol Vitic.  1994  45: 252-258  ; DOI: 10.5344/ajev.1994.45.2.252
Stefano Poni
Dipartimento di Colture Arboree, Università di Bologna, Via Filippo Re, 6, 40126 Bologna, Italy
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Alan N. Lakso
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James R. Turner
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Richard E. Melious
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