1, pruning. After the end of the first year of planting, the pruning will be started until the main trunk is straightened to about 8 meters. Pruning is carried out after the trees stop growing and is completed before the beginning of spring. The first pruning is to remove the branches that compete with the trunk and ensure that the main trunk is straight; the second is to trim the lateral branches of the lower plate so that the spinach is evenly divided, and the height of the side branches is trimmed: 1-3 years, a small amount of pruning, 4- It is trimmed to 1/3 of the height of the tree in 5 years and trimmed to 1/2-2/3 in height after 6 years. 2, drainage. It is carried out all year round to ensure that the groundwater level is below 80 cm, especially during the rainy rainy season. High temperature and drought, drought and replenishment. 3, a reasonable fertilization. Poplar fertilization in the early years can increase the growth base and promote growth in the following years. In the first year after planting, the first fertilizer was applied at the end of May and early June. 0.05 to 0.1 kilograms of urea per plant was spread in the area of ​​1-2 square meters at the base of the roots before the rain, and the second fertilization was possible at the end of July. The quantity and method of fertilization are the same as those for the first time. In the second and middle period of May, each plant was given 0.5 kg of calcium phosphate and 0.2 kg of urea; in the third year of May, 0.25 kg of urea was applied per plant. The method of fertilization is to open a 20 cm deep annular groove at the outer edge of the near crown projection, or to dig a 20 cm deep hole at no less than 3-4 places on the outer edge of the crown, apply the fertilizer and immediately cover the soil. The latter method should ensure that the holes are evenly distributed in all directions to avoid uneven growth and cracking of poplar trunks. 4. Pest control. The young crab moths and moths of Yang Xiao Zhou are serious pest-eating pests on poplar trees in our city. When these two kinds of pests occur in the city for 4-5 generations a year, and in July and August when they are seriously damaged, they may eat up the leaves twice, which greatly affects the growth of poplars. Due to the occurrence of many generations and overlapping phenomena in generations, it is difficult to spray once to achieve complete prevention and control effects. It must be carefully investigated during the prevention and treatment. The maximum amount of insects is in the larval stage, and when the loss of poplar leaves is minimal, it is the optimal time for prevention and control. On July 25th and August 25th, due to the differences in phenology in each year, the investigation of insects must be advanced by half a month in order to make adequate preparations for prevention and control. Organic phosphorus or carbamates may be used for systemic action during prevention and control. pesticide. The prevention and control of stem pests Sangtianniu can be controlled by injecting 1% organophosphorus pesticides into the defecation holes. It is advisable to perform the treatments in the late April and early September in one year. 5, loose soil. It is recommended that it be carried out once a year in the winter and can be combined in the early years. Three minutes and seven minutes, to achieve good economic returns, we must strengthen management. Strengthening the post-planting management of poplars is a work with less investment and significant economic benefits.
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