Grapes are divided into the germination period, flowering period, young fruit period, swelling period, coloring maturity period, and wintering period in a year. These periods, if managed properly, can effectively increase grape yield and quality. These periods are also the key to using fertigation. period.
1. In the germination stage: Generally, a germination fertilizer is applied before germination to promote shoot growth and shoot sprouting. In the germination stage, nitrogen fertilization is the main fertilizer, which can effectively promote the growth of new shoots and leaves.
2. Flowering stage: In the flowering stage, fertilization is mainly applied to phosphorus (phosphorus is mainly to promote flower bud differentiation), and germination fertilizer is applied before flowering. If quick-acting fertilizer is selected, it can be 3 to 5 days in advance, compound fertilizer is advanced 15 ~ 20 days to apply.
3, young fruit period: fertilization of young grape fruit period, potassium fertilizer should be the main, in order to promote the rapid expansion of young fruit, and prevent the occurrence of various symptoms of potassium deficiency. Potassium can promote the ripening of grape young fruit, increase the sugar content of the fruit, reduce the acidity, and enhance the grape taste and redness.
4. Inflation: During the expansion period, more potassium is required than in the young fruit period. This is the highest peak of the year when the grapes need fertilizer. The potassium fertilizer is sufficient, which can effectively increase the speed of grape fruit enlargement, promote fruit coloring, sweetening, and prevention. Drops and other phenomena.
5, color maturity: If the color is not good at this time, you can apply a potash again, if the root fertilization is sufficient, can be appropriate to flush some potash fertilizer products, promote coloring, sugar.
6. After Harvest: Grapes harvested, in order to quickly restore the injury, safe winter, does not affect the products of the coming year, can apply some nitrogen fertilizer (to promote the recovery of injury) and phosphate fertilizer (to promote root development). Can be applied within 1 month after harvest, the sooner the better.
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