Vol. 74 No: 4

Title:
The effects of hydrogen cyanamide on budburst and fruit maturity of 'Thompson Seedless' grapevine

Authors:
J. CARREÑO, S. FARAJ and A. MARTINÉZ

pp: 426-429

Abstract:
The effect of hydrogen cyanamide (H₂CN₂) on budburst and fruit maturity of 'Thompson Seedless' grapes was examined. Nine year old vines of cv. Thompson Seedless grafted on R.110 rootstock and supported on overhead tendone trellis (parral), were treated with either 2% or 4% of H₂CN₂, 53 and 67 d before expected budbreak and compared with unsprayed vines. The earliest treatment with 4% H₂CN₂ enhanced budbreak and advanced fruit maturity by 17 d. However, the same concentration applied 53 d before natural budbreak advanced the date of maturity by only 4 d. All the treatments increased significantly the percentage of budburst compared with the control. H₂CN₂ had no significant effect on yield, but a positive effect on fruit quality. A higher index of maturity was obtained by the treatment: 4% H₂CN₂, 67 d before budbreak. All the treatments of H₂CN₂ induced more uniform budburst compared with the control. The best uniformity was obtained by the earliest spray using the higher concentration (4%).

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