What about grape-sized particles? What are the prevention and control measures?

Grape is a widely loved fruit, which is widely cultivated, but the size of particles in its growth process is easy to affect the economic benefits, so what should we do? What are the prevention and control measures? First of all, you need to understand what caused this situation.

First, the reasons for the size of grape particles

1. Out of control of fertilizer and water management, the application of nitrogen fertilizer is too much, and the water supply is too large.

two。 The plant load is light and the branches grow too long to reach the corresponding yield.

3. Single application of chemical fertilizer neglects the application of organic fertilizer.

4. The flowering stage is earlier and the leaf leaves are less.

5. The amount of dense branches on the shelf surface at flowering stage resulted in good ventilation and light transmission at flowering stage, resulting in low abortion rate and loose ears at flowering stage.

6. The short shelf surface of single and double vines is too low, which leads to the strong growth of plants, especially the grafted seedlings.

II. Prevention and control measures

1. Water control: 10 cm below the surface before flowering can be held by hand to form a group of water before 2 times of water, that is, low-lying land or clayey soil once or irrigated.

two。 Fertilizer control: less nitrogen fertilizer before flowering or organic fertilizer should be applied more phosphorus and potassium fertilizer from the hard core stage to the coloring period.

3. Reasonable adjustment of plant load: all 4-year-old grapevines are about 10 kg at flowering stage, the length of branches is more than 20 cm, the thickness is more than 20 cm, and the thickness of 1 cm is 1 cm. Double ears should be left at the corner of the stand and strong branches on the tip, especially double ears or double branches and single ear.

4. Reasonable pruning: strong branches within a distance of 25 cm (refers to 1.2 cm thick upper branches) should be thinned if the distance between branches is more than 20 cm, multi-bud pruning should be taken to supplement the vacancy when wiping buds and fixing branches in spring the following year, two heads should be kept between the branches, about 25 cm apart from branches and 3 buds to be wiped the following spring when wiping off terminal buds, leaving 1-2 buds, leaving strong branches, leaving double-spike branches with a distance of 15 cm, leaving basal buds with a distance of 15 cm, leaving the rest to keep the tree momentum mediocre.

5. Pinch the tip and break the vine: 3-5 days before flowering, the double-bud branch group should leave the long and short branches, 6-8 leaves, long branches (strong branches)-8-10 leaves should be 10 centimeters long or 20 centimeters less, pinch off 1x5.

6. Cutting off the surface root: the surface root of the 4-year-old grape with large and small grains needs to be cut off its method: before the autumn shelf, the surface root can be cut off with a spade and the root cutting distance can be more than 10 cm from the base of the plant. Otherwise, the growth of the leaf is slightly slow in spring, and the leaf yellowing needs to strengthen fertilizer and water management and quickly restore the tree potential.

7. Twist branch: 3-4 days before flowering, the upper part of the branch is twisted or flattened.

8. Using the second branch knot: when the grape grain is close to the size of the soybean grain, it is obvious that the upper branches and leaves are cut off at 5-6 leaves and the second branch-knot time should be carried out before June 20. It is advisable to have a high setting rate and a neat maturity of 7-10 days later.

9. The use of expansion agent: Jufeng grape has clearly seen the size of the grain (it takes about 15 days) to soak the ear once (or evenly spray) the grain has elasticity to find that there is a crack in the coloring period should timely control water or rain drainage.

10. Using a new type of tree promoter-PBO: it has the characteristics of promoting grape grain size, positive color, early ripening, anti-cracking and increasing yield. The dosage should be determined according to the tree situation. It is suitable to irrigate 5-7 grams per tree 1-2 days before flowering. The application of 2.5g per tree scaffolding 250g per mu 250g per mu hedge 250g 500g for the second time in about 25 days spraying solution concentration 100g 250 times the practice shows that Jufengwang trees significantly increase the use of PBO to control nitrogen fertilizer should be applied urea 100g 150g per plant in early April combined with spraying urea June potash fertilizer can be harvested twice and irrigated immediately At the beginning of October, 3000 kilograms of farm manure should be applied and irrigated twice.