Yi Yang has strong adaptability, rapid growth, straight trunks, low pests and stems, wide use of wood, good marketability, and high economic returns. The enthusiasm of the people for planting Italian poplars is increasing. Therefore, Yiyang has now become afforestation. The main tree species. Its high-yield cultivation techniques are described as follows: 1. According to the requirements of big seedlings, big ponds, big fertilizers, large waters, and large plant spacings and deep planting, “Five Great Depths†require the planting of Yi Yang. 1.1 Use large seedlings for 2 years for 1 year dry or 2 years dry, 4 meters above the seedling height, 4 centimeters above the root diameter, or 1 year for 1 year root, 3 meters above the seedling height, and 3 cm above the root diameter. The transplanting is done on the same day as digging the seedlings. If the transplanting cannot be done on that day, the roots of the seedlings should be soaked in water. The depth of the soaking water is preferably about 1 meter to facilitate the seedlings. If seedlings are transferred to other places, beating and moisturizing work should be done to prevent the seedlings from affecting their survival due to water loss. Soaking the roots of seedlings in the water and replenishing the water in a timely manner after transplanting should be carried out as early as possible to shorten the time from raising seedlings to transplanting. When raising seedlings, roots should be taken as much as possible. Generally 3-4 meters of seedlings, the main root should be kept more than 40 centimeters, and the lateral roots should be kept more than 25 centimeters. 1.2 Digging big ponds to plant 3-4 meters Yang Yang Miaoshu pond is 80 centimeters in diameter, 80 centimeters deep and 70 centimeters deep. When digging the pond, it is required to separate the topsoil and the soil and soil, and fill the soil with stratified filling. First, return 10 cm of top soil to the topsoil and cover with a thin layer of soil. Then put the roots of the seedlings into the pond and fill in the topsoil. At 1/2, raise the sapling upwards to extend the roots of the seedlings and then compact the soil. When the soil is filled 20 centimeters from the mouth of the pond, a bucket of water is poured down. After the water is soaked, the soil is compacted and leveled. The uppermost layer is covered with a layer of crushed loose soil and the head shape is slightly broken. Eli water, if you can moisten the grass in the mouth, the effect will be better. 1.3 In addition to pouring enough water to planting water, if the plant is in drought that year, it must be watered and drought-resistant in time. Digging shallow pond or ring ditch can be watered in the outer of tree shrubs. After the water is infiltrated, soil should be cultivated in time and the surface layer should be covered with loose soil to reduce the evaporation of water in the soil. 1.4 Fertilizer planting should be accompanied by the base fertilizer, base fertilizer in situ, can be used in the roots of the tree in the mud, can also be used 0.25kg compound fertilizer or 5-10kg mixed fertilizer mixed into the subsoil. The fertilizer must be mixed well with the soil and cannot be applied directly to the roots. Before the closure of the young forest, it can be used as a cultivator instead of fertilizing the forest crops and supplementing the tree nutrition. If a single application of fertilizer is applied during the growing and dormant periods of the trees, the growth of the trees can be accelerated and the trees can be promoted to form early. Fertilizer can be applied at the opening of the canopy around the opening of the canopy or open ditch ring, each time about 0.25kg of urea per plant. 1.5 Large-row spacing Large-diameter materials are grown, requiring large plant spacing when planting. Such as single row planting, spacing of 3-4 meters is more appropriate; into a piece of planting, suitable plant spacing of 3-5 meters 8 meters, 40 plants per 667 square meters, generally require each nutrient area of ​​20 square meters. If some areas have a large initial planting density, they should be harvested during the time, and they should be kept at a small height during thinning to facilitate the cultivation of large timber and improve economic efficiency. 1.6 Properly deep-planted in the river embankment and Gaochun area can dig 1 meter big pond, planting depth of 80 centimeters; in the saline-alkaline soil area in the east can also be digging 60-70 centimeters pond, planting depth of about 50 centimeters; General areas can be dug into 70 70 centimeters cm in size, planting depth of about 60 cm. 2, planting time Yi Yang in the winter after mid-December can be planted, the best time for planting in February-March. 3. Post-planting management After the planting of Poplar, it is necessary to promptly do a good job of drought resistance, earth-cultivation, compaction, weeding, soil loosening, and pest control work. Forest trees and forests may be used as intercropping before forest trees are closed, but high-yield crops cannot be planted. It is necessary to timely carry out pruning and to ensure the formation of trunks, but pruning and eradicating buds generally cannot exceed half the height of the trees during young forests. To keep close to the tree trunk, you must not leave it in order to obtain good materials in the future.
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