Walnut fertilization timing and key technical points: fertilizer amount and type vary by growth stage

Walnut tree fertilization can use methods such as broadcast application over the whole orchard, hole application, strip application, radial application, ring application and disc application. For example, the strip application method: open a strip-shaped trench about 40cm wide and 50cm deep between the rows or plants of the fruit trees, apply fertilizer into it, mix the soil and fertilizer evenly, then cover with soil.

I. The role of base fertilizer

Walnut trees require different amounts and types of fertilizer at different growth stages, and the basic fertilizer for their growth is base fertilizer. Walnut base fertilizer is mainly composed of decomposed farmyard manure and organic fertilizer. In addition to applying base fertilizer when planting walnuts, during their growth period, base fertilizer also needs to be applied as a top dressing every spring and autumn. It can promote flower bud differentiation and root growth, which helps increase yield. When fertilizing, it can be combined with deep plowing and fertilization, followed by watering, which can promote nutrient absorption.

II. The role of top dressing

On the basis of applying base fertilizer, walnut trees also need reasonable fertilization according to their different growth stages, which can promote the growth of walnut trees and improve their yield and quality. Under normal circumstances, walnut trees need top dressing 3 times.

1. Growth fertilizer

After applying base fertilizer, walnuts are generally given reasonable growth fertilizer according to their growth conditions, which is beneficial to the growth of new branches and flowering, and plays a role in shortening the growth time. Growth fertilizer is mainly quick-acting nitrogen fertilizer, applied together with an appropriate amount of phosphate fertilizer. This top dressing accounts for 50% of the total top dressing amount, so this top dressing needs to be sufficient; otherwise it will affect their growth and development, and also affect their flowering and fruiting.

2. Flower and fruit fertilizer

Walnut trees need flower and fruit fertilizer before and after flowering, which is beneficial for promoting flowering and achieving the effect of promoting flowers and protecting fruit. This fertilization is mainly nitrogen fertilizer, applied together with phosphate and potassium fertilizer. Top dressing at this time can supplement the nutrients they need, also promote branch growth, and prompt timely nutrient transport.

3. Fruit-strengthening fertilizer

Walnut trees need fruit-strengthening fertilizer during the fruiting period, roughly in late June, and this is also the last fertilization in the process from flowering to fruiting. This time it is mainly phosphate and potassium fertilizer, applied together with an appropriate amount of nitrogen fertilizer, to maintain balanced nutrition. This fertilization can improve their quality and yield.