First, nursery choice. Flat land, fertile soil, loose soil, well-drained water, and easy-to-use microalkali or neutral sandy loam are selected as breeding grounds. Before wintering, evenly spread crushed coarse fat 5000 kg to the nursery and deepen the seedlings until spring.
Second, seed processing. 1. Select species. When nurturing seedlings, seedlings are planted on trees that have good adaptability, have a large number of early fruits, produce a high yield, have a thin shell, are full of seed, have easy access to kernels, have a high rate of kernels, and grow robustly from 20 to 40 years of age. 2. Processing. After the collected walnuts are peeled off, they are dried in bamboo baskets or drapes. Avoid direct exposure to the cement floor. After drying, put it in a cloth bag or sack and store it in a dry and ventilated room. After the soil is thawed in spring, the walnut seeds used for seedlings are soaked in water in a cylinder and replaced with fresh water once a day. After 10 days to 15 days, until the seeds fully absorb water, expand, and crack, remove and sow.
Third, seed cover film. 1. Sow. Before the beginning of winter, we will plant seedlings with a width of 1 meter, a long-term seedling condition and a certain number of seedlings. After the surface is slightly dry, use a rake to open a 10 cm deep ditch 25 cm away from the rake. According to the amount of 50 kg per mu, the compound fertilizer and a certain amount of pesticide poisonous soil will be evenly spread in the ditch and separated from the seeds with a light cover soil. The surface is vertical, with the tip pointing toward the side in the ditch, and the side of the seed being placed with a foot, so that the seed is tightly bound to the soil. The second line was broadcast at 25 centimeters, and the third line was broadcast at 25 centimeters. After sowing, the soil was covered with 3 to 5 centimeters of land and repressed. Then the second row of gongs is broadcast from 25 cm away, and so on. 2. Cover film. After sowing, the agricultural film with a width of 90 cm and a thickness of 0.005 mm was laid on the surface of the sampan. The soil on both sides was tight and the seeding film was used to protect the crop. Herbicides should not be used within the mulching.
Fourth, seedling management. 1. Uncover the film. Found that seedlings unearthed, to be timely seedlings to prevent sunburn. 2. The cultivator loose soil. After the seedlings are unearthed, weeding and weeding should be conducted in time to reduce the competition for weeds on the water nutrient of the seedlings. 3. Fertilize and water. Fertilization can be combined with rainfall, usually two times during the growing season. The first time in late June, mainly available nitrogen, Mushi urea 15 kg to 20 kg. The second time in late July, topdressing compound fertilizer is better, and the mu application amount is 20 kg to 25 kg. Fertilizer should be applied 5 cm to 10 cm away from the nursery stock and covered with soil. If there is no rain and the soil is dry, apply water after fertilization. After 8 months, it is not suitable to top-dress fertilizers to prevent the seedlings from being greedy for appetite. The growth of walnut seedlings requires a lot of water. If the soil moisture is insufficient, it needs to be watered in time. Watering should be carried out after the seedlings are unearthed. The time and frequency of watering can be determined according to the degree of soil drought, generally 3 to 5 times, the amount of watering should be large, and the water should be poured thoroughly. During the rainy season, pay attention to the drainage of the nursery to prevent injury due to injury.
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