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Article

The Effect of Concord Vineyard Microclimate on Yield. II. The Interrelations between Microclimate and Yield Expression

R. E. Smart, N. J. Shaulis, E. R. Lemon
Am J Enol Vitic. January 1982 33: 109-116; published ahead of print January 01, 1982 ; DOI: 10.5344/ajev.1982.33.2.109
R. E. Smart
Ruakura Soil and Plant Research Station, Private Bag, Hamilton, New Zealand
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N. J. Shaulis
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E. R. Lemon
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Abstract

Concord grapevine yields were increased by less severe pruning and divided-canopy training. For high node numbers per vine, the yield components of shoots per node, berry weight and sugar concentration were reduced. The number of berries, especially on the primary shoot, was more important in affecting yield per node than variations in berry size. A very large difference in yield per node was observed and, even for adjacent nodes on four-node bearers, there was no correlation between node yields.

This difference in yield per node was shown to be positively correlated with variation in the radiation microclimate of the subtending leaf in the growing season preceding fruiting. The correlation was highest for leaves well exposed in the pre-bloom period, especially for those with constant illumination.

  • Received August 1981.
  • Revision received January 1982.
  • Accepted January 1982.
  • Copyright 1982 by the American Society for Enology and Viticulture

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The Effect of Concord Vineyard Microclimate on Yield. II. The Interrelations between Microclimate and Yield Expression
R. E. Smart, N. J. Shaulis, E. R. Lemon
Am J Enol Vitic.  January 1982  33: 109-116;  published ahead of print January 01, 1982 ; DOI: 10.5344/ajev.1982.33.2.109

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The Effect of Concord Vineyard Microclimate on Yield. II. The Interrelations between Microclimate and Yield Expression
R. E. Smart, N. J. Shaulis, E. R. Lemon
Am J Enol Vitic.  January 1982  33: 109-116;  published ahead of print January 01, 1982 ; DOI: 10.5344/ajev.1982.33.2.109
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