Cultivation Techniques of Poplar Fast-growing and High-yield Forests In order to achieve fast-growing, high-yield, high-quality and high-efficiency poplars, scientific cultivation techniques must be applied. According to the research results and practical experience of poplar cultivation techniques in our province, we should mainly grasp the following technical points: First, site selection. The selection of afforestation sites suitable for the growth of poplars is the basic condition for realizing rapid and high yield of poplars. Poplar is a fast-growing tree species in deciduous broad-leaved trees. It grows best on deep, loose, fertile, moist, and well-drained alluvial soils. The poplar plantation in our province is mainly in plain areas and flood lands. Afforestation sites should have the following Conditions: 1. The soil is deep and the effective soil thickness is greater than 1.0 meter. 2. The soil texture is lighter. Black poplar tree species (such as Europe and the United States Yang and American poplar varieties) with light and sandy loam soil is the best, followed by soil and tight sand; poplar tree species (such as Populus tomentosa) can grow in the more light soil. 3. The groundwater level is suitable. The suitable groundwater level for poplar growth should be about 1.5 meters. During the growth period, the groundwater level should be less than 1 meter and not less than 2.5-3 meters. 4, soil nutrient content is high. Minimum requirements: The organic matter content is more than 0.4%, and the nitrogen content is more than 0.03%. Effective nitrogen is greater than 15 mg/l, available phosphorus is greater than 2 mg/l, and effective potassium is greater than 40 mg/l. 5, soil without salt or mild saline alkali. The soil salt content should be below 0.1%, and the groundwater salinity below 1 g/l. Second, meticulous site preparation. After the afforestation site has been leveled and the irrigation and drainage ditch system has been repaired, fully deep plowing (or deep plowing) is carried out for more than 30cm, and then a large hole is drilled, with a diameter of 0.8-1.0m and a depth of 0.8-1m. Third, use seedlings and seedlings 1. According to different cultivation targets, select the appropriate and superior varieties that have passed the provincial tree species certification. (1) Glued plates. Plywood requires large diameter materials, dry and straight, without knots, moderate wood hardness, spin-cutting, drying, and good gluing performance. Suitable for cultivating plywood is mainly fine varieties of black poplars, such as I-69, I-72, L323, L324, Zhonghe No. 1, T26, T66, and Zhonglin 46 Yang. (2) Pulp materials Pulp materials require fast growth of poplar varieties, light wood color, high wood density, high cellulose content, long fiber length (should reach 0.9mm or more), fiber aspect ratio greater than 35, and wall-to-cavity ratio less than 1 With low impurity content, poplar species suitable for the cultivation of pulp materials include: I-69 Yang, I-72 Yang, L323, L324, L35, Zhonghe 1, Zhonglin 46, I-107, Zhonglin 23 Yang Wait. (3) Furniture materials. It is required that the trunk be straight and full, with less knots, higher wood density, fine structure, low heartwood content, high mechanical strength and hardness, easy drying, small shrinkage, easy processing, and good adhesive paint performance. The main varieties are Lu Mao 50, Yixian female plants, I-69, I-107, L35, I-102, T26, T66, Zhong Lin 23 Yang and so on. 2, use strong seedlings. The experiment proved that the black poplar seedlings with a rootage of 1 year in 2 years, or 2 years in root in 2 years, a height above 4.5 m, and a DBH of 3.5 cm or above are not only short in seedling period, but also have strong ability to resist natural disasters, and they grow fast and grow into talents. Early, high output. The requirements for strong seedlings are well-developed root systems, thick seedlings, high degree of lignification on branches, full and full-filled top buds, no mechanical damage, and no pests or diseases. Fourth, afforestation density. Rationally designed planting densities should be determined based on the characteristics of poplar varieties, site conditions for afforestation sites, cultivation objectives, and rotation cycles. Good site conditions for afforestation. Fast-growing, larger tree crowns, large-diameter cultures, lower density, poor site conditions, selection of dry, straight, and narrow-crown varieties, high density when cultivating short-rotation stands some. According to the national wood standard regulations for poplar wood, combined with the results of research on afforestation densities of high yield forests in poplar forest in Shandong, the planting densities of short-cycle pulpwood were 23 meters, 33 meters, and 34 meters, and the afforestation density of plywood was 56 meters. 66 meters, 48 ​​meters, in order to cultivate large diameter timber. Excerpt from: Shandong Forestry Technology Promotion Network