1 Mi Walnut likes light, cold resistance, drought resistance and strong disease resistance, adapts to all kinds of soil growth, likes fertile and moist sandy loam, likes water, fertilizer and sunshine, and has no strict requirements on water and fertilizer, so it is not suitable for pruning after defoliation and before germination, which is easy to cause bleeding. Suitable for most land growth. Calcareous soil is common in deep soil on both sides of the valley.
Strong adaptability, less pests and diseases, labor-saving management, convenient storage and transportation of fruits and long service life. Walnut trees like warm and light, and have strict requirements on water, especially in the new shoot growth period and fruit development period, which need sufficient water supply, so they should be planted in sandy loam with loose structure, water retention and good ventilation. The growth cycle of walnut is divided into germination stage, leaf spreading stage, flowering stage, fruit hard core stage and fruit maturity stage. Fertilization period is flowering period, new shoot growth period, flower bud differentiation period and after harvest. Commonly used fertilizer spraying types are 0. 1% ~ 0.2% boric acid, 0.5% ~ 1% ammonium molybdate and 0.3% ~ 0.4% copper sulfate.
When sowing, the suture line of the seed is perpendicular to the ground, which is beneficial to the smooth growth of radicle and bud. The suitable time for branch grafting is between beginning of spring and rainy season, and the best time is when the juice begins to flow out and the top bud of the rootstock has germinated. The suitable time for bud grafting is around the vernal equinox, when the rootstock begins to sprout, the top bud spreads its leaves, and the bark is easy to peel off. The grafting interface and scion were covered with plastic bags and wrapped with wet sawdust for insulation. The grafting survival rate was over 95%. Grafting of walnut cotyledon seedlings. When the seed buds will expose the true leaves, cut off the rootstock buds on the petiole at 65438±0cm, then put them into a healing pool or a simple greenhouse, and transplant them into the field after survival.