This study was conducted through the seasons of 1995 and 1996 to determine the optimal bud loads per vine for Thompson Seedless grapevines. Ten years-old-uniformed vines were chosen and pruned to five different levels of bud load, namely 48, 60, 72, 90 and 120 buds per vine. Canes number was fixed for all treatments by 6, while bud number was differed from 8, 10, 12, 15 and 20 buds per cane.The results showed that the fruitful cane could be divided into 3 parts according to number of fruitful buds, basal, middle and distal part. Low fruitful buds were found in the basal part, then increased rapidly in the middle part and reached its higher number in the distal part. Increasing of bud load decreased bud burst and increased fruitful buds, number of bunchs and yield per vine. However, it increased dormant buds, while it significantly decreased bunch weight, T.S.S., carbohydrates in new canes, wood ripening while acidity was increased. It was found that the optimal bud load/vine was 72 to 90 buds to produce high yield with good quality and maintaining the vigour of the vine.
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