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Grape Trials: Concord

A.E. Nightingale, Ph.D.
Professor Emeritus
Horticultural Sciences
Texas A&M University
Location: Grandview, Washington
Variety: Concord

This field trial was performed on 15-acres of vineyard. The three treatment blocks had three applications of 30 gallons/acre (mixed 1 oz of Spray-N-Grow/gallon of water). The first application was at bud break, the second shortly after petal fall, and the third 30 days later.

DOUBLE CURTAIN – 726 Vines Per Acre
Control Block: 24 lbs/vine, 8.71 tons/acre, 19.2 sugar solids
2 Applications: 27.66 lbs/vine, 10.04 tons/acre, 18.9 sugar solids
3 Applications: 47.33 lbs/vine, 17.18 tons/acre, 19.5 sugar solids

COMMENTS: The 3 application plot gave a 97% yield increase (8.47 tons per acre). At $180.00/ton, that is an increased income of $1524.60 per acre. Sugar increase = 0.3 Brix.

STANDARD TRELLIS – 650 Vines Per Acre
Control Block: 31 lbs/vine, 9.37 tons/acre, 17.6 sugar solids
3 Applications: 43 lbs/vine, 13.10 tons/acre, 20.2 sugar solids

COMMENTS:
The 3 application plot gave a 39% yield increase (3.73 tons/acre). At $180.00/ton, that is an increased income of $671.40/acre. Sugar increase = 2.6 Brix.