1. Name of tree species. Walnuts, hi light, hi warm and cool climate, resistance to dry and cold, not wet heat, is a good ecological and economical tree species. At present, new varieties suitable for development include: Luguang, Liao nuclear series, Zhonglin series, Qingshui thin-skinned walnut, Xiangling and so on.
2. Suitable habitats: Suitable for deep fertile, loose and moist, well-drained sandy loam soil and loam soil, not salt and alkali.
3. Afforestation design. The plant spacing of clone walnut afforestation is generally 56 meters or 58 meters, ie 250-330 plants/ha, seedlings are 3 years old (seedling age), the budding base diameter is 0.8 cm or more, the height is 50 cm or more, and the main root length is 25 cm. No less than 15 lateral roots, full buds, no drainage, no mechanical damage is appropriate.
4. Afforestation technology measures. (1) Land preparation. Time: In advance of a rainy season. Method: Fengchan Hang, Big Fish Scale Pit, Level Order. That is: suitable for high-yield pits for gentle slope farmland; level steps for steep-slope farms; large fish scale pits and horizontal steps for gentle slopes, which can be gradually transformed into water platforms (belts); (2) afforestation. Both spring and autumn can be planted. The spring is planted before the bud, and the autumn is planted before the fallen leaves. Before planting, we must do a good job of three tasks: "seal dry, repair and repair roots, and make up for bottom water." That is, the seedlings are dried at a certain height, and then the cuts are waxed in a timely manner. The main lateral roots damaged during the seedling repair are trimmed and repaired, and then soaked in water for 24 hours to allow the seedlings to suck in the bottom water. When planting, it should be conducted according to the procedure of “digging pits—watering—planting seedlings—covering earth—peeling— coatingâ€. Cover soil is higher than the original soil mark 3 to 5 cm. The film should be low and high outside the "washbasin"; (3) tending. In the first five years after afforestation, it is necessary to adhere to the annual fertilization and irrigation of weeds. And change the film every two years. Docking buds (seedlings) shall be patched in a timely manner and timely replanting shall be carried out for seedlings and dead seedlings. And timely prevention of pests and mice damage. Especially in the first three years, it is necessary to do a good job of preventing winter freezing of young trees. Before and after each winter, put 5 kg of donkey dried horse manure in the “film bowl†of each tree, cover it with soil, and plan to harvest it in mid-December of the year; 4) Agroforestry management. Lines of walnut trees between 4-6 meters away from the trunk can be interplanted with legumes, alfalfa, vegetables, herbs and other low-rod economic crops. However, avoid planting deep-rooted perennial, high culm and easily provoke the Chinese phenol-rich vegetables, herbs and other crops.
5. Note. (1) Walnut light tree species, should not be mixed with fast-growing tree species; (2) seedling stage (1 to 8 years), fertilizer application of phosphorus and potassium fertilizer, less nitrogen fertilizer, in order to improve the ability of winter overwintering; (3) walnut intercropping Can not interplant peanuts, potatoes, onions, licorice, astragalus, Codonopsis, Chinese angelica, red peony, Banlangen so as not to cause the spread of rodents.
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