The timing of fertilizing grapes matters, and choosing the right fertilizer period is key

SummaryThe timing of applying base fertilizer to grapes: apply 3-4kg of organic fertilizer in autumn. The timing of topdressing grapes: before and after budding, nitrogen, phosphorus and potassium fertilizers can be applied; before and after fruit drop, nitrogen, phosphorus, potassium, magnesium and boron fertilizers can be applied; during the young fruit swelling stage, nitrogen and phosphorus fertilizers can be applied; during the berry coloring stage, phosphorus, potassium, nitrogen and magnesium fertilizers can be applied. Topdressing should be determined according to soil quality, climate and tree age. In high temperature and rainy conditions or sandy soil, the number of topdressing applications should be greater, while for young trees the number of topdressing applications should be fewer.

1. Timing of applying base fertilizer to grapes

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

2. Base fertilizer is generally mainly organic fertilizer. The specific amount applied needs to be determined according to the age of the grape tree. If it is a young tree, 3-4 kg of organic fertilizer can be applied. Application methods include trench application and broadcast application on the bed surface, etc.

2. Timing of topdressing grapes

1. On the basis of applying base fertilizer well, topdressing still needs to be carried out many times. Topdressing is supplementing fertilizer to grapes. How many times are generally needed and when to supplement need to be determined according to soil quality, climate and tree age. Generally, in high temperature and rainy conditions or sandy soil, the number of topdressing applications should be greater, while for young trees the number of topdressing applications should be fewer.

2. As the tree age increases, the fruiting amount increases and the growth vigor slows down, the number of topdressing applications should gradually increase, which is beneficial to regulating the contradiction between growth and fruiting. For adult grape trees, 2-4 fertilizer applications are needed per year, mainly divided into the following periods.

3. Before and after budding: After budding, the stages of new shoot growth, flower bud differentiation and leaf growth all require large amounts of nitrogen fertilizer, so fertilization is mainly nitrogen fertilizer, and phosphorus and potassium fertilizers can be applied together during this period.

4. Before and after fruit drop: Before and after grape fruit drop is a stage with relatively high fertilizer demand. At this stage, young fruit and new shoots grow rapidly and flower buds begin to differentiate, all requiring large amounts of nutrients. This topdressing is beneficial to promoting normal growth of new shoots, promoting rapid development of young fruit, and can also reduce physiological fruit drop and effectively increase the fruit setting rate. It is also mainly nitrogen fertilizer, then combined with phosphorus, potassium, magnesium, boron and other fertilizers.

5. Young fruit swelling stage: At this stage, the underground root system, aboveground branches and leaves, and fruit of grapes are all growing rapidly, so nitrogen and phosphorus deficiency is likely to occur, thereby affecting yield. During this period, topdressing is still mainly nitrogen fertilizer, then combined with phosphorus fertilizer.

6. Berry coloring stage: When the berries enter the early stage of maturity, generally when colored varieties begin to color and green varieties begin to soften, topdressing is carried out. It is generally mainly phosphorus and potassium fertilizers, combined with a small amount of nitrogen and magnesium fertilizers. It has a clear effect on increasing grape berry size and improving coloring degree and sugar content, and can also prevent Kyoho grapes from yellowing leaves and early leaf drop.