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Grape Yield Management - Problems with Over-Cropping

Roots of Peace. Kenneth R. Tourjee Over-cropping means maintaining a crop level which exceeds vine capacity. It can result in delayed fruit maturity, possible reduced fruit quality, reduced vegetative growth and delayed maturation of shoots into canes. Vines that are chronically over-cropped decline because the plant does not produce enough photosynthate to service fruit growth, replacement of vegetative parts and development of buds. They have more sinks than can be supported by their sources. In some temperate short-season areas approximately 10 to 14 sq cm of leaf area per gram of fruit (or about 18 leaves per cluster) are required to complete the maturation of a grape crop.....

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