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Precautions for walnut fertilization

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When should I fertilize when planting walnuts?

Fertilizer is generally applied in autumn, and applied as soon as possible after the fruit is harvested and before the leaves fall. If it is too late to apply in autumn, it can be applied in spring. Applying basal fertilizer in autumn can promote the differentiation of flower buds, root growth, improve the nutrient storage level of the tree, and it is conducive to the growth of branches and leaves, flowering and fruit setting in the coming year. The sooner the basal fertilizer is applied in autumn, the better. Young walnut countries can combine deep plowing and applying human base fertilizer, and adult orchards can use the method of shallow plowing the soil after spreading in the whole garden to apply the base fertilizer. After applying the base fertilizer, irrigate the base fertilizer once.

How to fertilize effectively?

1. Walnuts are carried out before the female flowers bloom and at the early stage of leaf development, with quick-acting nitrogen fertilizers as the mainstay, such as urea and ammonium sulfate. Top dressing in this period can promote flowering and fruit setting, which is conducive to the growth and development of new shoots. For walnut trees that enter the full-fruit stage, it is necessary to apply quick-acting nitrogen fertilizer and phosphate fertilizer before germination in spring, and the amount of fertilizer applied should account for more than 50% of the annual topdressing amount, otherwise the lack of nutrients in the early stage will hinder the growth and development of the tree, affecting flowering, Fruit set.

2. After the female flowers bloom and the walnuts are applied at the end of leaf development, nitrogen fertilizer is the main method, and appropriate amounts of phosphorus and potassium fertilizers are used. At this time, top dressing can promote fruit development and reduce fruit drop, which is conducive to branch growth and lignification. The fertilization amount should account for 30% of the annual topdressing amount of the land.

3. In late June, after the fruit has hardened, a top dressing is carried out, with phosphorus and potassium fertilizer as the main fertilizer, and a small amount of nitrogen fertilizer. The purpose of top dressing in this period is mainly to satisfy a large number of nutrients needed for seed kernel development, improve nut quality, and promote flower bud differentiation, laying a solid foundation for flowering and fruit setting in the coming year. The amount of top dressing this time should account for 20% of the annual top dressing amount. 

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