Effects of bud number and cane length on bud fertility and some characteristics of grapevine cv. Bidaneh sefid

Because grapevine bud number (charge) and cane length affect different factors such as leaf area, plant growth rate, bud break percentage, fruiting shoots percentage, fertility coefficient, number and weight of cluster and fruit quality, therefore in this research, effects of 48 and 72-bud charges together with the cane length having 4, 6 or 8- bud length and their interactions in Bidaneh Sefid cultivar were studied using a factorial experiment in RCBD with 3 replications (each plot as a whole plant). Results showed that increasing the length of cane, charge and their interaction cause to increase the cluster number, fruiting shoots number and fertility coefficient significantly and had no undesirable effects on dimension and weight of cluster. In other words, results show that there is more fruiting in apical buds of cane in this cultivar than first 1-4 buds (which are mostly vegetative) and longe prunning in seedless cultivars appears to be necessary