First, topdressing and watering. Scientific topdressing and watering is an important measure to improve the nutritional status of trees, increase the growth of poplars and shorten the cutting cycle. Poplar topdressing can use nitrogen fertilizer or compound fertilizer, both of which have obvious yield-increasing effects. Newly planted young trees can be applied less and later in the same year. Top dressing time: It is best to plant in July and August of that year, which is the peak period of poplar growth, and top dressing can get twice the result with half the effort. Fertilization amount: urea 0. 1kg per plant can be applied to 4 holes, that is, within the distribution range of tree roots, 4 holes with a depth of 20cm are evenly dug around the trunk 30cm, mixed with soil, applied with fertilizer, and finally covered with soil. Topdressing should be combined with watering to give full play to the fertilizer effect as soon as possible.

Watering is generally 4 times a year: before germination in late March; Promote the expansion of branches and leaves from May to June every year; Water in summer drought; 165438+ frozen water is poured in October. After watering, intertillage to keep moisture. After the newly planted poplar is planted, water it 1 time. Pay attention to clear the accumulated water in the forest in time when it rains continuously, so as not to affect the root growth. In addition, because the newly planted poplar has shallow roots, it is easy to lodging in the wind after watering and raining, so it is necessary to cultivate the body and consolidate the soil in time.

Second, sprout and prune. Poplar has strong germination ability, and timely pruning can make the trunk straight and complete, and cultivate good materials without knots. After the initial planting, the basal buds should be pulled out in time, and the buds can be wiped below 50 cm of the seedling stem. Leave as many new branches and leaves as possible, increase photosynthetic area, accumulate nutrients and promote root system. After defoliation in autumn and winter, before germination in the following spring, the competitive branches in the upper part of the crown are trimmed or shortened, and the weak branches below the long branches are removed.

Third, intertillage and loosen the soil. Planting trees is the same as growing grain. After planting, it is necessary to strengthen management and protection, prevent human and animal injuries, and loosen the soil and weed in time. It is very important for poplar to loosen soil and weed in the growing season. It can effectively prevent weeds from competing with young trees for soil moisture and nutrients, improve soil ventilation and water permeability, promote microbial reproduction and soil organic matter differentiation, and improve poplar root respiration. The depth of loosening soil is generally 5 ~ 10 cm, shallow inside and deep outside, so as not to damage the roots. Forest land should be ploughed at least once a year 1 time to prevent soil hardening. The time can be carried out in late autumn and early winter when defoliation is turned, or in the growing season when weeding is carried out. There are many nutrients in the leaves of poplar high-yield forest. It is beneficial to maintain soil fertility and improve forest growth to plough and crush the fallen leaves of forest land in late autumn and early winter every year.

4. Pest control: The newly planted poplar leaves the nursery with more root injuries, weak resistance and more drought in spring, which is prone to poplar canker. Control methods: cultivate disease-resistant varieties, strengthen water and fertilizer management of trees, and then coat them with carbendazim and thiophanate-methyl 100 times solution.

Poplar pests are mainly leaf-eating pests, such as inchworm, Yang Fan Zhou moth, Yang Chu moth, American white moth and so on. Can spray omethoate, beta-cypermethrin and other systemic insecticides 1500 times solution. For dead trees, clear them in time to avoid spreading diseases.

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