Walnut trees have strong adaptability, fewer pests and diseases, save labor in management, facilitate fruit storage and transportation, and have a long lifespan. Walnut trees like temperature and light, and have strict water requirements, especially during the growth period of new shoots and fruit development. They require sufficient water supply and should be planted in sandy loam soil with loose structure and good water retention and breathability. The growth cycle of walnuts is divided into the germination stage, leaf expansion stage, flowering stage, fruit hard core stage, and fruit maturity stage.
Before planting in acidic soil, lime should be applied, and attention should be paid to deep soil plowing or tree disc plowing to facilitate early fruiting, high yield, and stable yield of young trees. The fertilization amount for walnuts is: 1-2 year old young trees, with an annual application of N 0.1kg, and appropriate application of P.K fertilizer according to soil content; Apply 150-250kg of stable manure to adult tree base fertilizer plants. Phosphate fertilizer 1.5-2.5kg, ash fertilizer 2.5-5kg. Apply topdressing 2-3 times a year (before germination, after flowering, and during fruit hard core stage), with 1-2.5kg of nitrogen fertilizer applied to each plant.
1. Base fertilizer. The base fertilizer should be applied as early as possible, and should be completed after harvest and before defoliation. 100~200kg of excellent Manure should be applied to each adult tree.
2. Top dressing. The suitable period for topdressing is before flowering, during which the young fruit expands and the fruit has a hard core. Generally, each plant is treated with 0.8-1 kg of Tianji brand nitrophosphate fertilizer.
3. Spray fertilizer on the leaves. The spraying period includes flowering period, long term shoot speed, flower bud differentiation period and after harvest. The commonly used spraying types are 0.1%~0.2% boric acid, 0.5%~1% ammonium molybdate, 0.3%~0.4% Copper(II) sulfate, etc.
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