Chapter 30

Crop Estimation in Vineyards

(book excerpts)

Estimating wine grape yields is a process of projecting as accurately Estimating wine grape yields is a process of projecting as accurately as possible the quantity of crop that will be harvested for a vineyard. In normal situation, the grapevine yield can be variable from year to year (10 to 20%), thus yield estimation is essential to help make decisions, both for the grower and the vintner. Grape growers are concerned about the yield, to ensure that fruit composition target values are met, and to maintain the vine size for a future crop. Early forecasts of grape yield can significantly enhance the accuracy of scheduling labor, delivery, purchases of related materials and so on. Wineries need to know how many grapes they will be expected to process in a vintage. This affects their logistics, from the tank and barrel space to scheduling of grapes for processing. Crop yield is a function of three factors—the number of bearing vines, the number of clusters per vine, and the cluster weight.

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