Summer is the season of vigorous seedling growth, which generally accounts for 60% ~ 80% of the total annual growth, and it is also the most serious season of drought, pests and diseases. As the saying goes; Trees are planted in three parts and seven parts. Post-planting management is the key to the survival of trees. After planting trees in spring, although the seedlings germinate and spread branches soon after planting, the roots of the seedlings are damaged during feeding, and the water and nutrients they carry are limited. In hot summer and high temperature environment, it is necessary to replenish water and nutrients to spring seedlings in time, effectively and timely to ensure the normal growth of seedlings. The following are some key points on how to maintain and manage summer seedlings for your reference:

First, timely irrigation and watering to keep trees and soil moist.

In summer, the temperature is high, the water evaporates quickly, and trees and soil are prone to water shortage. When the seedlings suffer from drought, they should be irrigated with water or watered artificially, and the seedbed should be thoroughly watered to keep the soil moist. The watering frequency and interval days should be decided according to the actual situation. If it rains several times after planting, you can reduce the amount and frequency of watering. If it continues to be hot and rainy, it is necessary to increase irrigation. The amount of irrigation should not be too much or too little at a time, otherwise the roots will soak or suffer from drought, which will affect the survival of transplanted trees.

Second, loosen the soil and weed in time.

After each rainfall or irrigation, intertillage and weeding should be done in time. Sowing seedlings is not convenient to loosen the soil. Weeds between seedlings can be pulled out, and then a layer of fine soil is spread on the bed surface to prevent the roots from being exposed. Tillage should be gradually deepened, but seedlings should not be damaged or crushed, and roots of seedlings should not be damaged when weeding. According to the experiment, the surface temperature of loosening soil at noon on sunny days is about 8℃ higher than that of non-loosening soil, so it is not suitable to loosen soil at noon on sunny days with high temperature and drought, and it is best to do it in the morning, evening or after rain on cloudy days.

Third, the method of fertilization should be appropriate.

Fertilization should not be too high, nor should it be applied too much at one time. Water or lightly apply water and fertilizer in the morning and evening, and never sprinkle chemical fertilizer between seedlings. Water and fertilizer can be applied after loosening the soil and weeding.

Fourth, pay attention to pest control.

In summer, seedlings are prone to diseases and pests such as damping-off, root rot, leaf-eating insects and bud-eating insects. When rice sheath blight and root rot occur, it can be controlled by spraying Ji and ethylicin 1500 times solution and thiophanate-methyl. When leaf-eating and bud-eating pests occur, they can be controlled by spraying 600 times of catching liquid. Underground pests, such as grubs and crickets. You can spray green peppers and water them, or you can catch them manually. At the same time, strictly do a good job in the prevention and control of American white moth (confidential insecticide for killing moths).

5. Spacing and fixing seedlings in time.

Intercropping should be carried out after rain or irrigation. For seedlings that are too dense, poorly grown, stunted, injured and have diseases and insect pests, and "overlord seedlings" that affect the growth of most surrounding seedlings, fast-growing broad-leaved trees need to be interplanted 1-2 times, and slow-growing conifers such as cypress trees should not set seedlings prematurely, and seedlings can be set after 2-3 times. After thinning, it is best to water with dilute manure to improve the survival rate of seedlings.

6. Shading work is also critical.

Excessive temperature is not conducive to the growth of seedlings. After shading, the surface temperature can be reduced by about 65438 00℃. Therefore, where conditions permit, the seedlings should be shaded to facilitate their growth.

Newly planted trees in early spring can generally spread their branches and leaves at the beginning of the growing season, but some of them are not really alive, but "fake". Once the temperature rises and water is lost, this "fake" plant will wither, and if it is not rescued in time, it will die in the hot and dry season. Therefore, the survival of newly planted trees can be determined at least after the first year of high temperature and drought.