Abstract
Gibberellic acid (GA3) is widely used to enlarge the berries of seedless grapes (Vitis vinifera L). In cv. ‘Sultana’ (Thompson Seedless) the addition of 1000 mg/L urea phosphate (UP) to GA3 solutions after fruit set reduced the pH of the solutions to a stable pH 2.9 and enhanced the effect of GA3 on berry size and delayed maturation. Addition of citrate buffer, pH 2.9, to GA3 sprays did not affect berry size or maturation. The possibility of improved GA penetration due to the low pH is considered. The nutritional effect of UP and direct enhanced penetration by the urea ion are also discussed.
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Contribution from the Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel. No. 1735-E, 1986 series.
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Shulman, Y., Fanberstein, L. & Bazak, H. Using urea phosphate to enhance the effect of gibberellin A3 on grape size. Plant Growth Regul 5, 229–234 (1987). https://doi.org/10.1007/BF00024698
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DOI: https://doi.org/10.1007/BF00024698