The time of fertilization for grapes should be chosen at the right time.

The time of applying base fertilizer to grape: applying organic fertilizer 3-4kg in autumn. The time of topdressing grape fertilizer: nitrogen, phosphate and potassium fertilizer can be applied before and after sprouting; nitrogen fertilizer, phosphate fertilizer, potassium fertilizer, magnesium fertilizer and boron fertilizer can be applied before and after flowering; nitrogen and phosphate fertilizer can be applied in young fruit expansion stage; phosphorus fertilizer, potassium fertilizer, nitrogen fertilizer and magnesium fertilizer can be applied in berry coloring stage. Topdressing depends on soil quality, climate and tree age. Topdressing in high-temperature, rainy or sandy soil is more frequent, while that of young trees is less.

First, the time of applying base fertilizer to grapes

1. Generally, the temperature change in autumn is smaller than that in spring, and the temperature of air and soil is higher than that in spring, so it is beneficial to wound healing and new root growth. Generally, the survival rate of grape seedlings planted in autumn is more than 90%, which is about 20% higher than that in spring.

2. The base fertilizer is generally based on organic fertilizer, and the specific amount of fertilizer needs to be determined according to the age of grape trees. If it is a young tree, it can be applied with 3-4 kg organic fertilizer, and the fertilization methods include ditch application and border sprinkling and so on.

Second, the time of topdressing grapes

1. On the basis of applying good basic fertilizer, topdressing needs to be carried out many times. Topdressing is to fertilize grapes. How many times and at what time do they need to be replenished, depending on the soil quality, climate and tree age? generally, the number of times of topdressing in high-temperature, rainy or sandy soil is more, while that of young trees is less.

2. With the increase of tree age, when the fruit quantity increases and the growth slows down, the times of topdressing should be gradually increased, which is beneficial to adjust the contradiction between growth and fruit. for adult grapevines, it is necessary to supplement fertilizer 2-4 times a year, which is mainly divided into the following periods.

3. Before and after germination: after sprouting, a large amount of nitrogen fertilizer is needed in the stages of shoot growth, flower bud differentiation and leaf growth, so nitrogen fertilizer is the main fertilizer, and phosphorus and potassium fertilizer can be applied during the period.

4. Before and after falling flowers: the grape needs more fertilizer before and after falling flowers. At this stage, young fruits and shoots grow rapidly and flower buds begin to differentiate, all need a lot of nutrition. This topdressing is beneficial to promote the normal growth of new shoots and promote the rapid development of young fruits. It can also reduce physiological fruit drop, effectively improve fruit setting rate, mainly nitrogen fertilizer, and then combined with phosphorus, potassium, magnesium, boron and other fertilizers.

5. Young fruit expansion period: at this stage, the underground roots, aboveground branches, leaves and fruits of grapes are growing rapidly, so it is easy to have insufficient nitrogen and phosphorus, thus affecting the yield. During this period, topdressing is still dominated by nitrogen fertilizer, and then combined with phosphorus fertilizer.

6. berry coloring period: in the early stage of berry ripening, the general colored varieties begin to color, and when the green varieties begin to soften, topdressing is generally carried out, mainly by topdressing phosphate and potassium fertilizer, combined with a small amount of nitrogen and magnesium fertilizer, which can not only increase the grape berry, but also prevent the leaf color of Jufeng grape from yellowing and early falling.