How to improve the market quality of grapes? Detailed practical measures
1. Cluster selection: keep good clusters with a neat shape, uniform fruit set, and a drooping posture. 2. Cluster shape adjustment: on the basis of conforming to the variety's natural shape, tidy them up slightly; clusters of the same variety throughout the vineyard should be basically uniform. 3. Cluster elongation: for varieties with a high fruit-set rate, when the cluster is 7-10 cm long,...
1. Cluster selection: keep good clusters with a neat shape, uniform fruit set, and a drooping posture.
2. Cluster shape adjustment: on the basis of conforming to the variety's natural shape, tidy them up slightly; clusters of the same variety throughout the vineyard should be basically uniform.
3. Cluster elongation: for varieties with a high fruit-set rate, when the cluster is 7-10 cm long, spray or dip the cluster with 3-5 mg/L gibberellin to elongate the cluster. For seedless varieties, 6-10 days after flowering or after flower appearance, dip the cluster with 10 mg/L gibberellin, which is beneficial for fruit set.
4. Berry thinning: it is recommended, on the basis of removing the shoulder and secondary clusters, to focus mainly on removing small clusters, supplemented by berry thinning.
5. Berry enlargement: 10-15 days after the second treatment, dip the cluster again with 20-25 mg/L gibberellin plus 2 mg/L forchlorfenuron to enlarge the berries.
6. Bagging: carry out bagging 2-3 weeks after flowering. Two weeks before bagging, spray twice (one week apart) 300 times calcium nitrate or 600 times humic acid calcium, which can relatively make up for the shortcomings of bagged fruit such as small berries, low sugar, bland flavor, and poor storability caused by calcium deficiency.
Choose bags of suitable size, colorless, transparent, resistant to rain washing, and with drainage holes.
After bagging, check and promptly replace wet bags, burst bags, torn bags, and fallen bags.
If drought occurs before removing the bags, water first and then remove the bags; at harvest, grasp the degree of maturity and pick by variety, by stage, and in batches to ensure the quality of the berries.