Effect of training, pruning and harvest time on growth, yield and fruit quality of selected grapevine cultivars under Gezira conditions, Sudan

Suheir A. Osman, Osman M. Elamin, Mohamed E. Elkashif

Abstract


Experiments were conducted at the University of Gezira research farm in Wad Medani, Sudan during the period of January 2005 to March 2007, to study the effect of training systems and pruning levels on the performance of introduced grapevine cultivars under the Gezira conditions, Sudan. Treatments consisted of four introduced seedy cultivars: Alphonse, Muscat, Black Prince and Almeria and two introduced seedless cultivars: Flame Seedless and Sultanine. Three training systems, namely; head, cordon and trellis, and three pruning levels, namely; severe, partial and control were used. Harvest times were September and November. The experimental design used was the split-split plot design with three replications. Cordon training   system resulted in the highest yield followed by arbor trellis and the lowest yield was obtained by the head training system. Severe pruning scored the highest yield followed by partial pruning and unpruned vines resulted in the lowest yield. Under all training systems, severe pruning always resulted in higher yields than partial and unpruned vines, probably due to the lack of competition between vegetative and reproductive growth for stored assimilates. The best results were obtained when using the cordon training system coupled with severe pruning. Results also showed significant differences between cultivars in yield and fruit quality. The seedless cultivars Sultanine and Flame Seedless gave the highest yields and the best quality values in terms of TSS and rind thickness compared


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