1, germination accelerating fertilizer
Generally, it is applied before the grapes germinate. This time, high-nitrogen water-soluble fertilizer was mainly used to promote orderly germination, thick leaves and large and strong inflorescences. Ribelli bird's nest high nitrogen water-soluble fertilizer can be applied, which is more conducive to the growth of grapes. If the tree is too strong and not very dry in spring, you can omit the fertilizer and water at this time, so as not to cause the new buds to grow white.
2. Expansive fertilizer
After the grapes set fruit, that is, when the fruit is as big as mung beans, smear it. This time, nitrogen fertilizer is the main fertilizer, and phosphorus and potassium fertilizer are also applied. Water-soluble fertilizers with high nitrogen, low phosphorus and low potassium can be applied, and nitrogen fertilizers such as urea can be added as appropriate. The amount of fertilizer applied this time is large, which can account for about 50% of the annual fertilizer application.
3, ripening fertilizer
It is carried out in two times. 20 ~ 30 days before ripening, apply high-potassium water-soluble fertilizer, at this time, the content of potassium fertilizer should be high, in order to achieve the purpose of fruit expansion, coloring, sugar increase, disease resistance and yield increase. Ribelli bird's nest high-potassium water-soluble fertilizer containing 44 potassium can be applied, and the grape expansion effect is obvious. When the grape berries begin to soften and have not been colored, apply 1 times fertilizer.
This fertilization is very important. Many fruit farmers do not apply ripening fertilizer after applying swelling fertilizer, which leads to fruit discoloration (commonly known as tank disease); Or because of lack of fertilizer, grapes are poor in stress resistance, easy to get sick, high yield and no harvest; Or poor coloring, low sugar content, unable to sell at a good price and so on.
4, the month is fat
It means that 1 times fertilizer should be applied after the grapes are harvested, usually water-soluble fertilizer (high nitrogen type). The function of this fertilizer is conducive to restoring tree vigor, promoting flower bud differentiation and laying the foundation for high yield in the coming year.
5. Overwintering fertilizer
The traditional method is to use it when the grapes are dormant. In recent years, it is advocated to apply it in August and September, and also during the growth of green branches and leaves after grape harvest. At this time, it is the second peak of grape root growth, which can promote grapes to produce a large number of fibrous roots, make the tree strong and more conducive to wintering. Fertilizer is organic fertilizer (if farmyard manure is applied, it must be fermented and decomposed! ) is given priority to, at the same time applying calcium fertilizer and high phosphorus compound fertilizer.