White pine is generally used for sowing and breeding, and the nursery should be well drained, and the sandy loam with flat terrain and deep soil layer is better. The following small series introduces the seedling technology of the white pine.
1. Seed germination: The seeds of Pinus bungeana should be sterilized by using Bordeaux liquid soaking seeds. Soaking seeds with warm water (50 ° C to 60 ° C) before sowing can be germinated or mixed with sand. If the number of seeds is 50% of the total number of seeds, they can be sown. This is so strong and tidy that it can be unearthed in 15 to 20 days.
2, seed sowing: sowing is generally 10 to 15 days after the soil is thawed (late March to early April) is the best. Before the sowing, water is poured into the surface, and 1 to 1.5 kg per 10 square meters can be planted, and about 1,500 plants can be produced, which can be widely spread or spread. Cover the fine sand 1 to 1.5 cm after sowing, use 125 grams of turfgrass per acre and add 25% of wettable herbicidal ether 250 grams of water to 25 kilograms, sprinkle on the seedbed with a sprayer to weed. Finally, take a small arch shed on the surface of the raft to increase the temperature and moisturize, increase the emergence rate, and do not need to water before emergence.
3, post-production management: Because the mouse loves pine nuts, before the arch shed film, you need to sprinkle some rat poison on the surface. After the seedlings are managed, the seedling bed is gradually increased in ventilation time, and the resistance is enhanced by refining the seedlings. White pine is light, but the seedling is more shade-tolerant. After removing the film, it should be covered with a shade net to prevent the danger of high temperature sunburn and blight.
4, watering weeding: long drought or rain or summer high temperature should be watered in time, weeding should master the principle of removing the early, small, and clean, planting between the plants to prevent damage to the seedlings, to spread the seedlings after weeding Appropriate soil cover to prevent cracks, strip seedlings weeding and loose soil combination, and the seedlings and seedlings should be combined at the same time, and should be drained in time.
5. Rational fertilization: The seedlings of Pinus bungeana should be based on base fertilizer and supplemented by topdressing. From the middle of May to the end of July, the topdressing period should be carried out 2 to 3 times of topdressing, with nitrogenous fertilizer as the mainstay, chasing decomposed human excrement or pig manure. The urine is 3 liters per mu, and the water is about 20 tons. The rotted cake fertilizer is 5 to 15 kilograms per mu, and the cake is about 15 kilograms of fertilizer water. About 4 kilograms of urea per mu is applied. Nitrogen fertilizer should be stopped at the late growth stage, and phosphorus and potassium fertilizers should be added to promote the lignification of the seedlings. The leaf surface can also be sprayed with 0.3% to 0.5% potassium dihydrogen phosphate solution.
6. Transplanting in time: The seedlings of Pinus bungeana are slow to grow and should be densely planted. If it is necessary to continue to cultivate large-sized seedlings, it is necessary to transplant 2 to 3 times before planting. The two-year seedlings can be transplanted with soil before the top buds have not sprouted in the early spring. The plant spacing is 20 to 60 cm, and the top buds are not damaged. After planting, the water is poured twice, and after 6 to 7 days, it is watered again. 4 to 5 years old seedlings can be transplanted with soil ball for the second time, with a row spacing of 60 to 120 cm. After survival, the soil around the roots should be kept loose. Each plant should be 100 to 120 kilograms of organic fertilizer. After burying the soil, it will be watered, and then strengthen management, promote growth and cultivate strong seedlings.
7. Pest control: After sowing, pay attention to the seedlings of the fly larvae, and the base fertilizer must be fully decomposed and chopped. Songda scorpion damages the seedlings and needles of the seedlings, which is easy to cause black mold, causing the tree to weaken or even die. It can spray 50% phoxim emulsion at the beginning of the damage, adding 2000 kg per kilogram.
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