Walnut tree fertilization technology

Walnut is an important oil fruit tree. Walnuts have high economic value. In addition to being rich in fat, walnuts are also high in protein, vitamins and minerals. They are often used as a high-grade tonic and have certain medical effects. China's walnut kernels are of good quality and high oil content, and are well received by the international market. The walnut tree is strong, adaptable, less pests and diseases, management and labor saving, convenient storage and transportation of fruit, and long life. Walnut trees are warm and hi-light, and have strict requirements on water content, especially in the growth period of new shoots and fruit development period. They need more water supply, and should be planted in sandy loam soil with loose structure and good water retention and permeability. The growth cycle of walnut is divided into germination stage, leaf extension stage, flowering stage, fruit hard core stage and fruit ripening stage. The fertilization of walnut is divided into base fertilizer and top dressing: 1. Base fertilizer. The base fertilizer should be used as early as possible, and should be completed before harvesting, and 100~200 kg of high-quality organic fertilizer should be applied to each adult tree. 2. Topdressing. The suitable period for top dressing is 3 periods before flowering, young fruit expansion and fruit hard core. Generally, each plant applies 0.8-1 kg of nitrophosphate fertilizer per plant. 3. Foliar spray fertilizer. The spraying period is the flowering period, the new shoot speed, the flower bud differentiation period and the harvesting. The common types of spray fertilizer are 0.1%-0.2% boric acid, 0.5%-1% ammonium molybdate, 0.3%-0.4%. Copper sulfate and the like. River

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