2, the swelling of the fertilizer in the grape fruit mung bean large to the peas when the application of large, mainly nitrogen, and phosphorus, potassium fertilizer. Fertilizer varieties can be selected from high-nitrogen compound fertilizer or common three-element fertilizer to add urea and other nitrogen fertilizers as appropriate. The amount of fertilizer is large, which can account for about 50% of the annual fertilizer application.
3, ripening fertilizer 20 to 30 days before maturity and grape berry start to soft but not yet colored when each application of potassium sulfate, can also be directly applied to high-potassium three-element fertilizer, such as nitrogen, phosphorus, potassium content 10%, 8%, 27% of Saco. When the ripening fertilizer is deficient, it is easy to cause fruit color change disease (commonly known as water tank disease), poor resistance, poor coloration, and reduced sugar content.
4. The “moon child†fertilizer is applied slowly after harvesting the grapes. The main function is to restore the tree potential and promote the differentiation of flower buds, laying a foundation for the high yield of the next year. We are generally applied at a standard of 15 kg of urea per 667 m 2 (1 mu).
5. The traditional method of wintering fertilizer is applied during the dormant period of the grape. In recent years, it is recommended to be applied in August-September. It is considered to be the second peak period of grape root growth, which can promote the occurrence of a large number of fibrous roots in the grape. The situation is more conducive to wintering. The fertilizer is mainly based on farmyard manure, and it is necessary to apply calcium fertilizer and a small amount of three-element fertilizer.
The amount of fertilizer applied per year and the amount of fertilizer applied per year can be determined according to soil conditions, tree age, yield and fertilizer quality. After each fertilization, the water should be poured once, but after the fertilizer is applied, the two waters should be poured (the interval is usually 5-7 days). In addition, before the wintering of the grapes, they should be irrigated once a day. After the soil is loose, they should be ploughed for 1 time, which is extremely good for freezing.
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