How to breed walnut seedlings in spring?

Seed selection: Select fully mature seeds from excellent varieties, so that the germination rate is high. That is, when walnut is harvested, most of the involucre (green peel) dehisces by itself, or the involucre that exceeds the maturity period for about half a month does not dehisce. II. Seed treatment: At the beginning of March, the seeds to be bred shall be stored in sand. The method is as follows: choose a place with leeward sun, use clean sand or local sandy loam, build brick walls on both sides of the front window root of the house, soak the seeds in cold water for 1-2 days, absorb enough water, then spread a layer of sand on the bottom layer, and put a layer of seeds on it; spread another layer of sand and put a layer of seeds... About 4-5 layers of seeds, covered with a layer of sandy loam at the top, then watered, covered with straw curtain or corn stalk at the top, watering once every two days to maintain the moisture content of sandy seeds for about one month. At the beginning of April, when the seeds sprout, soil preparation and sowing are carried out. Sowing method: for the convenience of management, the nursery land will be prepared according to the ridge. 6 m long, 4 m wide, 12-15 cm apart, 30-40 cm apart. Put the budding seeds and seed suture line vertically with the ground, 10-12 cm deep, 6-8 cm thick soil cover, do not step on the soil after covering, and irrigate enough water after the seeds are sown. By adopting the propagation method, the walnut seedlings broadcast are complete in seedling emergence and robust.