تاثير حلقه برداري به تنهايي و توام با اسيد بوريك بر ميوه بندي و صفات كمي انگور سلطانين (كشمشي بيدانه)

The Effect of Girdling and Girdling Plus Boric Acid Application on Fruit Set and Some Characteristics of Soltanin, a Seedless Grape Cultivar

Sultanin is an important seedless grape cultivar with good growth, but sensitive to berry dropping. Stripping, girdling, use of hormones as well as essential elements for reducing berry dropping and to increase fruit set have been studied by some researchers. In this study the effect of cane girdling and boric acid foliar spray on fruit set were studied. Girdling was carried out at the time of flowering and color variation of cane bearing fruits while foliar spray with boric acid at concentrations of 0, 1500 and 3000 ppm being carried out at a week before flowering. Fruit set percentage, bunch length, berry length, berry diameter and berry weight were the traits considered. Results indicated that, girdling at flowering time and boric acid ( 1500 ppm) application each separately had the highest effect on fruit set but their combination had no significant effect on this characteristic (p=0.01). Girdling and boric acid application had no effect on length and diameter of berries. Highest berry weight was obtained in boric acid application at a concentration of 3000 ppm.