The time and technical points of fertilization for walnut are also different in different growth periods.

The fertilization of walnut trees can be done by spreading fertilizer in the whole garden, burrowing fertilizer, strip fertilization, radial fertilization, ring fertilization and disc fertilization, such as strip fertilization: a wide 40cm is opened between rows or plants of fruit trees, and a strip ditch with deep 50cm is applied to fertilize, and the soil and fertilizer are stirred evenly and then covered with soil.

I. the function of base fertilizer

The amount and species of fertilizer needed for walnut trees are also different in different growth periods, and the basic fertilizer for their growth is base fertilizer. The base fertilizer of walnut is mainly rotten farm manure and organic fertilizer. In addition to applying base fertilizer during walnut planting, it is also necessary to apply base fertilizer in spring and autumn every year during its growth period. It can promote the differentiation of flower bud and the growth of root system, and increase its yield. Fertilization can be combined with deep ploughing fertilization, and then watering, can promote the absorption of nutrients.

Second, the function of topdressing

On the basis of applying basic fertilizer, walnut trees need to be fertilized reasonably according to their different growth periods, which can promote the growth of walnut trees and improve their yield and quality. in general, walnut trees need topdressing for 3 times.

1. Growth fertilizer

Walnut generally applied base fertilizer according to its growth situation, reasonable application of growth fertilizer, which is conducive to the growth of new walnut branches, flowering, play a role in shortening the growth time. The main growth fertilizer is available nitrogen fertilizer, combined with appropriate amount of phosphate fertilizer. The amount of topdressing accounts for 50% of the total topdressing, so this topdressing needs sufficient amount, otherwise it will affect its growth, development, flowering and fruiting.

2. Flower and fruit fertilizer

Walnut trees need to apply flower and fruit fertilizer before and after flowering, which is beneficial to promote flower blooming and achieve the effect of promoting flower and fruit. This time, nitrogen fertilizer is the main fertilizer, combined with phosphorus and potassium fertilizer. Topdressing at this time can not only supplement the nutrients needed, but also promote the growth of branches and promote the timely delivery of nutrients.

3. Strong fruit fertilizer

Walnut trees need to apply strong fruit fertilizer during the fruiting period, probably in late June, which is the last time they are fertilized from flowering to fruiting. This time, it is mainly phosphorus and potassium fertilizer, combined with an appropriate amount of nitrogen fertilizer, to maintain the balance of its nutrition. This fertilization can improve its quality and yield.