Walnut is an important oil fruit tree. Walnuts are of high economic value. Apart from being rich in fats, walnuts also have high levels of protein, vitamins and various minerals. They are often used as an advanced tonic and have certain medical benefits. China's walnut kernels are of good quality and high oil content and are well received by the international market. Walnut tree is strong, adaptable, less pests and diseases, management labor, convenient storage and transportation, and long life. Walnut trees are warm and happy, and their water requirements are strict. Especially during the growing period of new shoots and fruit development period, adequate water supply is needed. It should be planted in sandy loam with loose structure and good water permeability. The growth cycle of walnut is divided into the germination period, the leaf expansion period, the flowering period, the fruit hard nuclear stage and the fruit ripening period. Walnut fertilization is divided into base fertilizer and top dressing: 1. Base fertilizer. Basal fertilizer should be used as early as possible. It should be completed after harvest and before the leaves fall. Each adult tree should be applied with 100-200 kg of high-quality organic fertilizer. 2. Top dressing. The suitable period for topdressing is the period before flowering, the expansion of young fruit, and the hard core of fruit. Generally, each plant uses 0.8 to 1 kg of nitrite phosphate fertilizer. 3. Leaf spray fertilizer. During the period of flowering, flowering, new shoot speed, flower bud differentiation, and harvesting, the commonly used spray fertilizers were 0.1% to 0.2% boric acid, 0.5% to 1% ammonium molybdate, and 0.3% to 0.4%. Copper sulfate and so on. Ningbo DOKEE Medical Technology Co., Ltd. , https://www.dokeemedical.com