Abstract
Nutritional status of the vines, berry set, and yield as effected by the application of cycocel at 0.0, 500, 1000, or 1500 ppm and/or using a mixture of Mn, Zn, Cu, and Fe at 0.3% were studied. Cycocel was applied at different periods starting immediately after pruning and ending at 30 days after berry set. Results showed that three sprays of cycocel immediately after pruning, 15 days before first bloom, and at 30 days after berry set, particularly with the application of the four micronutrients together at 0.3%, proved much more effective in increasing the leaf content of total carbohydrates, total N, Zn, Mn, Cu, and Fe as well as berry set, number of clusters, yield and average cluster weight. Spraying Red Roomy vines three times with cycocel at 1000 ppm in combined with Mn + Zn + Cu + Fe at 0.3% gave satisfactory improvement in nutritional status and yield.
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