2, loosen the soil and weed. Because the canopy of seedlings is not closed, weeds grow rapidly, which will compete with seedlings for nutrition and will inevitably affect the growth of seedlings. Therefore, it is necessary to loosen the soil and weed in time to eliminate weeds around seedlings, trails and open spaces in time. When the topsoil is slightly dry after rain or irrigation, loosen the soil immediately to a depth of 5 ~ 10 cm. Be careful not to hurt the roots of the seedlings.
3. Water resources management. The production efficiency of Pinus bungeana is relatively high. Judging from the price of Pinus bungeana sold in Lantian, Shaanxi in recent years, the price of Pinus bungeana with 2m height is around 260 yuan, and that of Pinus bungeana with 2m height is around 380 yuan. It can be seen that as long as the height of Pinus bungeana is 50 cm, it will at least have an added value of 100 yuan. Therefore, under the condition of excellent soil texture in nursery, strengthening fertilizer and water management and promoting the vigorous growth of seedlings can effectively improve economic benefits.
4. Pay attention to the combination of base fertilizer and topdressing when fertilizing. The base fertilizer can be put into the planting pit when transplanting or applied in autumn and winter every year; Topdressing mainly uses compound fertilizer, which is applied in the growing season or in holes. Top dressing should be carried out at least three times a year. If possible, topdressing can be done before each germination and after the new leaves turn green in the growing season, so that the seedlings grow faster. The last topdressing every year is completed one month before the autumn and winter seedlings stop growing. So as to lignify the seedlings in time.
5. In the second transplanting stage, the seedlings of Pinus bungeana have basically reached the specification requirements of green seedlings, and the main goal of cultivation is to make the roots of seedlings dense, have certain dry and crown-shaped seedlings, and have no pests and diseases. Therefore, the focus of tending management is fertilizer and water management, pest control and pruning.
6, pest control. Pest control must implement the policy of "prevention first, comprehensive prevention", do a good job in the prediction and prevention of pests and diseases, and cultivate high-quality and healthy seedlings for urban greening. Do a good job in soil and seedling disinfection, and the seedlings can only be used after passing the quarantine inspection. Strengthen field management, reduce the breeding conditions of pests and diseases, make seedlings grow healthily and enhance stress resistance. Reasonable close planting, appropriate thinning, improve permeability conditions and reduce the occurrence of pests and diseases. Pests and diseases should be prevented in time.
7, plastic trimming. Requirements for plastic finishing. The shaping and pruning of urban greening seedlings is mainly based on natural tree shape, so that the crown width/height ratio is appropriate, the main and lateral branches are evenly distributed, the trunk of pine trees is complete and the crown is full.
8, street tree seedlings in the process of cultivation, requires a complete crown, straight and symmetrical trunk without scars, the main side branches. With the growth of Pinus bungeana, the height of branch points can be gradually moved up by pruning until the specified dry height, which is generally 2 ~ 2.5 meters. The natural height of seedlings is required to be above 4.5m, the crown width/height ratio is generally 1/3 ~ 1/2, and the crown width is required to be above 2m.
9, garden ornamental seedlings, fixed stem height is lower than the street trees, generally below 1.5 meters, full crown, crown/height ratio is generally 1/2 ~ 2/3, crown width is more than 2.5 meters, Pinus bungeana trees should be cultivated into full crown type or low stem type, and the main shoots should be raised well. Generally, it is not advisable to repair more.
10. It is worth noting that in the process of trunk cultivation, when the seedlings of Pinus bungeana fail to meet the predetermined specifications, the height of branch points should not be pruned in one step, because excessive pruning will weaken the tree potential and affect the growth. At the same time, pruning should be carried out step by step when the tree is strong, so that the wound can be easily healed and scars on the trunk can be avoided due to pruning.
1 1, plastic trimming period. Generally, plastic surgery is the main method in the dormant period, and the pruning amount can be slightly heavier. The growth period is mainly to adjust the tree potential, and the pruning amount should be light. For seedlings, in addition to transplanting pruning, whether dormant or growing, try not to prune, so as not to weaken the tree; Seedlings with weak tree potential shortly after transplanting are generally not suitable for pruning; Slow-growing saplings should not be felled again.