According to the soil conditions in different regions and different types of grapes during winter fertilization, the amount of fertilization and fertilization methods should be controlled.
The grapes are usually fertilized in the late autumn and early winter, and strip or circular fertilization methods are used. At this time, fertilization is mainly based on farmyard fertilizers. In general, chicken manure, duck manure and cow dung can all be used. It should be noted that the farmyard manure must be fully decomposed and sterilized by insecticide. Fertilization is supplemented with appropriate amount of fertilizer. Make vertical years of grape neat and tidy. The usage per mu is generally about 1.5 tons, and in the farmyard fertilizers, phosphate fertilizer can be added in a proportion of 40 kg/mu. In some cases of duck droppings, when rice straw is not completely rotted, it is necessary to add appropriate amount of nitrogen fertilizer in addition to phosphate fertilizer, which is generally about 7.5 kg/mu.
About one week before the sprouting of the grapes, 15 kg of potassium sulfate-based compound fertilizer and 5 kg of nitrogen fertilizer are added to the grapes. After the fruit is in the flowering stage after entering the flower, the amount of fruit fertilizer and bulk fertilizer used after flowering is 30 kg/mu. In some regions, if the viticulture is weak, 7.5 kg of nitrogen fertilizer and 15 kg of phosphorus fertilizer should be applied during fertilization. Potassium fertilizers need to be increased by 10 kilograms in areas where greenhouses are used to grow grapes.
For each growth stage of the grape, foliar fertilizer should be applied. Potassium dihydrogen phosphate and boron fertilizer can be added before application into flowers, and a small amount of urea can be used after flowering.
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