Effect of calcium cyanamide on bud burst, bud fertility yield, and on the quality of Cabernet Franc grapes

Abstract

Spraying calcium cyanamide (CaCN₂) on canes of Cabernet Franc (Vitis vinifera L.) grapevines at the pruning time at the concentrations of 0, 5, 10, 20, and 30%, caused a linear increase in the percentage of bud burst, in the number of clusters per cane, in the fertility and yield per bud, in the productivity of the vineyard, and in the total acidity of grapes. Calcium cyanamide at the concentration of 30%, in relation to the control, bad the best results, because it caused an increase of 32.65% in bud burst, of 29.59% in the fertility per bud, and of 32.45% in the productivity of the vineyard. However, it caused a light decrease in pH and in the °Brix /total acidity ratio. None of the concentrations used caused a significant effect in the variables weight per cluster, length per sprout, fertility and yield per burst bud, and °Brix.