Gibberellin is a plant growth regulator with the functions of preserving flowers and promoting growth and growth. It is often used on grapes, eggplants, tomatoes and other fruits and vegetables. It is necessary to know the amount of gibberellin used in different fruit and vegetable crops. Let us take a look.
Grapes: 10-20 days after the flowering period, spraying the gibberellin solution at a concentration of 100-200 mg/L on the young grape fruit can significantly increase the fruit setting rate and increase the fruit, and the yield can be increased by 50.3%. On the Kyoho grape, spraying the gibberellin solution at a concentration of 200 mg/L and the p-chlorophenoxyacetic acid 15 mgL mixture for 5 to 10 days before flowering can increase the fruit setting rate and the number of ear fruits, making it seedless. The rate is 92.2%-95.5%, and the seedless fruit has an average weight of 5.25~5.95g. At the same time, the sugar content of the grape fruit is 1.9% higher than that of the control (not sprayed with gibberellin), so the flavor is good, and the maturity period is 10-15 days earlier. The use of low concentration gibberellin on Kyoho grapes can increase the weight of the fruit and color the whole ear. The most suitable spraying period is the young fruit stage (7 days after Xiehua), and the most suitable concentration is 20 mgL. On the muscat grape, spraying the gibberellin solution at a concentration of 400 mg L after 10 days of flowering can achieve a nuclear-free rate of 98%. The fruit of the seedless grape can be significantly increased by using the gibberellin solution at a concentration of 100 mg/L for about 14 days after the flowering of the seedless variety, and other economic traits and commercial properties are not affected.
Eggplant: Spraying with gibberellin solution at a concentration of 25-35mg/L for one flowering period can control flower falling, promote fruit setting and increase yield.
Tomato: Spraying the gibberellin solution at a concentration of 30-35 mg/L for one flowering period can increase the fruit setting rate and prevent the empty fruit.
Citrus: spray a 50mg/L gibberellin solution after the first early physiological fruit drop; or spray 7 days after the flowering and after the first early physiological fruit drop to the second physiological fruit drop A gibberellin solution at a concentration of 50 mg/L. In the high temperature and dry weather, the use of gibberellin should be combined with proper watering orchard to improve the effect of maintaining flowers and fruits. It can be mixed with cytokinin to increase the fruit retention rate of the first physiological fruit drop. The use of gibberellin in Wenzhou mandarin should be applied to the end of the flowering period to the time of the flowering. When spraying, adding 0.2% urea, 0.2% potassium dihydrogen phosphate and 0.2% borax to the gibberellin solution can improve the protection. Flower fruit effect.
Kiwifruit: 2% gibberellin lanolin coated pedicel can significantly reduce the number of seeds of kiwi fruit, induce the formation of seedless fruits, and reduce the rate of fruit shedding.
Capsicum: Spraying the gibberellin solution at a concentration of 20-40 mg/L for 1 flowering can promote the fruit set and increase production.
Watermelon, melon, pumpkin, cucumber: Spraying the flower with the gibberellin solution at a concentration of 20-50 mg/L for one time, or spraying the baby for one time at the melon stage can promote the growth and increase of the yield of the young melon.
Rapeseed: Before the transplanting of rapeseed, the root of the gibberellin solution at a concentration of 20 mg/L is used to promote early plant growth and increase yield. Spraying 25mg of gibberellin solution on the foliage of the flowering stage can increase the seed setting rate of rapeseed.
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