Skillful application of foliar fertilizer
In the summer, depending on the growth of the grapes, the following foliar fertilizers are used:
1. Superphosphate leaching solution: Take 1 kg of superphosphate and add 5 kg of water, and dip for 12 hours to remove the liquid. When used, 50 kg of water per kg of filtrate can be used to obtain 2% of the leachate.
2. Grass ash leaching solution: Take 1 kg of grass ash and 5 kg of water, and dip for 24 hours to remove the liquid. When used, 50 kg of water per 2 kg of filtrate can be used to obtain 4% of the leachate.
3. Nitrogen and phosphorus mixture: Take 1 kg of superphosphate and add 5 kg of water, dip for 12 hours to remove the liquid, and add 2 kg of urea to the filtrate to form a stock solution. When using, apply 50 kg of water per kg of raw liquid. It is also possible to take 1 kg of fully decomposed human excrement supernatant and spray it with 50 kg of water. When spraying, the leaves are mainly used, and the shoots and young fruits can also be sprayed appropriately. Spraying in the evening without wind and rain is best, or between 8 am and 10 am. Generally, spray once every 10 days to 15 days, 2 to 4 times in a row.
Heavy-duty fruit fertilizer
After entering the summer, it should be promptly applied once with nitrogen fertilizer, phosphorus and potassium supplemented by summer fertilizer, generally 20 kg of urea per acre, 15 kg of phosphate fertilizer, 10 kg of potassium fertilizer.
Fertilization method: deep application can be carried out by circular or groove-like application method, and soil is applied after soil application. If the growth potential is strong, it can be fertilized 10 days after the flowering or when the fruit has the size of the mung bean grain. 500 g of the compound fertilizer is applied to each ditch, and the soil is timely watered and covered after the application to prevent falling flowers and fruit, and promote the young fruit. Rapid expansion and strong growth of shoots. 10 to 15 days before harvesting, applying 0.2% calcium chloride or 0.2% amino acid calcium for foliar application to control cracking.
Replenishing fruit fertilizer
After harvesting the grapes, the nitrogen fertilizer should be added in time to increase the leaf function, prolong the leaf life, increase the nutrient storage of the tree, and promote the restoration of the tree as soon as possible. Post-harvest nitrogen supplementation has two methods of spraying and root application. If the two are combined, the effect is better. Spray once every 10 days or so to spray 0.3% urea or 0.2% potassium dihydrogen phosphate mixture, and spray 2 to 3 times; root application of 10 to 15 kg of urea per acre is appropriate.
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