Effects of foliar application of potassium sources, gibberellic acid and 2, 4- Dichlorofenoxy acetic acid on the qualitative and quantitative characteristics of Vitis vinifera cv. Askari
2021
M. Shirdel | S. ٍEshghi | F. Hosseini | B. Shahriari
One of the cultivars of table grape in Iran is Vitis vinifera cv. Askari. But the smallness and non-uniformity of berry size have reduced its yield and attractiveness for consumers. Application of gibberellic acid, nutrients such as potassium as well as 2,4-D at the correct time can enhance the plant growth and fruit development. This study aimed to determine the most suitable gibberellic acid, 2,4-D, and potassium resources on quantitative and qualitative characteristics of Askari grape. This study was conducted on a research farm, on 30-year-old grapevine vines in the Koshkak region of Fars province of Iran in 2016. This experiment was arranged in a randomized complete block design with nine treatments and four replicates. Gibberellic acid at 50 mg/L, 2,4-D at 5, 10 and 20 mg/L, 10 mg/L 2,4-D + 50 mg/L GA3, 50 mg/L GA3 + 10 mg/L 2,4-D + 15 g/L K2SO4, 50 mg/L GA3 + 10 mg/L 2,4-D + 15 g/L KNO3, 50 mg/L GA3 + 10 mg/L 2,4-D + 15 g/L KCl and Distilled water as a control were used. The highest berry and cluster weights and lowest soluble solids content and total phenol were obtained in the treatment of 50 mg/L GA3+10 mg/L 2,4-D+15 g/L K2SO4 with mean of 2.58 g, 214 g and 14.25 ᵒBrix and 58.77 mg/kg, respectively. The lowest berry and cluster weights (1.70-118 g) were obtained from the 20 mg/L 2,4-D treatment. Also, the highest soluble solids content and anthocyanin were obtained from treatment of 20 mg/L 2,4-D with an average of 18.5 ᵒBrix and 41.71 mg/kg, respectively. Results have shown that the use of 50 mg/L of GA3 with 10 mg/L 2,4-D and the use of potassium sources, especially K2SO4 increased the yield and uniformity of the cluster and berry size.
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