Evaluation of Strategies for Pruning and Crop Control of Concord Grapevines in Southwest Michigan

摘要: Seven strategies for pruning and adjusting the crop level of Concord vines were evaluated over a six-year period in commercial vineyard southwest Michigan to determine their long-term influence on vine productivity, structure, fruit quality. Manual balance retained 44 nodes per kilogram cane prunings. Commercial manual resulted 25% more live 19% larger yield than pruning. clusters meter canopy but less node, smaller clusters, lower Brix managed with Nevertheless, did produce acceptable soluble solids five out six years experiment. Three severities mechanical yields that comparable at approximately 13 t/ha. As severity treatments decreased, number increased while node average cluster weight decreased. Moreover, range annual these became greater as Crop adjustment, applied combination by spraying ammonium nitrate solutions portion bloom, higher alone. Fruit from involving control commercially minimum standard 15 years. Distribution analysis revealed 90% all situated within top 60 cm trellis. Moderate or minimal pruning, whether used alone chemical not provide consistently quality Severe produced similar The response two was due compensating factors 45% reduction fruitfulness 75% increase severe hedging when compared positioning, follow-up after hedging, shoot an acceptable, sustainable practice managing vines.