1 Seedling technology
(1) Seeds collected in October from green to gray-brown, collected at the tip of microcrack, sun cracked, collected after the seeds fall out in sacks, placed in a well-ventilated, clean and odor-free warehouse storage. Eucalyptus seeds germination rate is about 50%, about 250,000 seeds per kilogram. (2) Nursery selection The nursery should be selected in a place with flat terrain, close to the water source, good drainage, deep fertile soil, loose and moist, and good lighting conditions. (3) Settling the soil to make three plows and three plows, the depth is more than 30cm, and the soil is finely crushed and leveled. In combination with soil preparation, 300,000 kg of waste fertilizer or 20,000 kg of manure was applied per hectare. Seeding bed width lm, length 8 ~ l0m, transplant bed width of 1 ~ 1.2m, depending on the length of the nursery, usually the natural length of the nursery, such as a long nursery, the seedbed length to l0m is appropriate. Bed height is 15cm, drainage ditch 30cm. (4) sowing local sowing in the middle and late March. Before sowing, soaking in warm water at 30°C for 4 hours, removing and drying, mixing wet sand with 3 to 4 times the seeds, mixing them in the room for germination, turning regularly and watering to keep the seeds moist. About 10 days, when the seed has 30% split mouth, you can sow. The sowing method is sowing, spacing 6-8cm, sowing rate of about 1.5lg per 667m2. After sowing, cover with a fine sieve over the soil, the thickness of about 0.5cm, and gently suppress the loose soil with a wooden board, then cover the grass. When 30% to 40% of the seedlings are unearthed, cover grass is removed in batches. (5) Transplantation When Eucalyptus seedlings grow on the sowing bed and the seedling height is 8 to 10 cm, they can be transplanted. Grafting time should choose cloudy days. The transplantation seedbed should be well-prepared before transplantation. The transplanted seedlings were planted 15 cm apart, 15 cm plant spacing, and 300,000 seedlings per hectare.
2 Cultivation methods
(1) Selection of afforestation sites Eucalyptus grow rapidly on deep, fertile, loose neutral soils, slightly acidic soils, and calcareous soils, and can also be found on light saline alkaline soils containing less than 0.1% salinity. Normal growth. However, it is very sensitive to soil moisture, not tolerant to drought, not tolerant to water, and unable to grow in low-lying water. Therefore, afforestation sites should be selected where the soil is deep and fertile, loose and moist, with good drainage, and sufficient light. (2) The planting season for planting eucalyptus on the site preparation is the best planting season from the end of November after the deciduous seedlings to the end of February of the following year. The site preparation time is late autumn in the early winter, and the rainy season has just passed. The soil is loose and wet, and the site is better if the mechanical resistance is not great. Site preparation can be divided into full-scale land preparation according to topography and landform, strip preparation and block preparation, and the soil preparation depth should reach 35cm. The band width of the land preparation is 1.0 to 1.5 m, and the specification of the block soil preparation is (50 to 80) cm (50 to 80) cm. The planting hole specification is (40-50) cm (40-50) cm (40-50) cm. Topsoil and earth and soil are stacked separately, picking stones and roots. The planting density was 1667 plants per hectare with a spacing of 2m3m. Strictly follow the "three burying and one stepping up seedlings" planting technology for planting. Properly trim the injured roots before planting, plant the seedlings upright in the center of the planting hole, stretch the root system by hand, fill the root system with the topsoil, gently raise the seedlings by 2 to 3 cm, fill the soil to a height of 2 to 3 cm above the ground plane, practise, and fill the soil. , and then practical; finally fill a layer of loose soil. (3) Management and protection One is to strengthen the degree of management and protection against human and animal damage to young trees. For the first three years after planting, weeding and ripping were performed. The second is to strengthen the prevention and control of pests and diseases. The pests and diseases of eucalyptus mainly include the following: (1) The wooden ulnar warts that harm the leaves; (2) The plackets that damage the cadres; (3) The larvae that harm the branches; (4) Rust, tip blight, and nodule disease. Must be preventive, timely control.
3 Cultivation effect
(1) nursery. Eucalyptus seedlings are transplanted and the seedlings grow rapidly. The average seedling height is up to l00cm, the maximum height is up to 150cm, the average ground diameter is 0.8cm, and the maximum ground diameter is up to 1.8cm. The seedlings of the first and second seedlings in the nursery can reach more than 95% of the total seedlings. (2) Forest growth. According to the determination of 13.3 hill artificial forest eucalyptus forest located in the northwestern part of Qinglong County, the average stand height is 14.8m, the maximum height is 18.2m, and the average chest height area is 0.0296?, the area per hectare. 48.84m2, average breast diameter 19.4cm, maximum DBH 36cm. On average, 369.074 cubic meters per hectare were accumulated.
4 Summary
(1) Eucalyptus can improve the quality of nursery stock by transplanting and raising seedlings, and increase the amount of qualified nursery stocks per unit. (2) The eucalyptus can be planted in a small area and planted at a density of 2m3m, which can achieve the effect of rapid growth and high yield.
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