After planting trees in summer, what is the appropriate frequency of watering?

Summer is the season when seedlings grow vigorously, generally accounting for 60% to 80% of the total annual growth. It is also the season when drought, diseases and insect pests are the most serious. As the saying goes, trees are planted in three parts and managed in seven parts. Post-planting management is the key to tree survival. After planting trees in spring, although the seedlings sprout and spread their branches quickly after planting, the root system of the seedlings is damaged when they rise, and the water and nutrients they carry are limited. In the hot summer and high temperature environment, it is necessary to replenish the spring seedlings in a timely, effective and appropriate manner. To ensure the normal growth of seedlings, here are some key points on how to maintain and manage seedlings in summer for your reference:

1. Timely irrigation and watering to keep the tree and soil moist

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The temperature is high in summer, water evaporates quickly, and trees and soil are prone to water shortages. When seedlings are affected by drought, water should be diverted for irrigation or artificial watering or drenching in time to soak the seedbed and keep the soil moist. The frequency of watering and the number of days between waterings should be determined based on actual conditions. If there are several heavy rains after planting, the amount and frequency of watering can be reduced. If there are continuous high temperatures and little rain, the amount of irrigation will need to be increased. The amount of irrigation should not be too much or too little each time, otherwise it will soak the roots or cause the roots to suffer from drought, which will affect the survival of the transplanted trees.

2. Timely loosening and weeding

After each rainfall or irrigation, it is necessary to cultivate the soil and weed in time. If it is inconvenient to loosen the soil by spreading seedlings, the weeds between the seedlings can be pulled out. Then sprinkle a layer of fine soil on the bed surface to prevent roots from being exposed and ventilated. The loose soil should be deepened gradually during cultivating, but do not damage or press the seedlings. Do not damage the roots of the seedlings when loosening the soil and weeding. According to tests, the surface temperature of loosening soil at noon on a sunny day is about 8℃ higher than that of non-loosening soil. Therefore, it is not suitable to loosen soil and weed at noon on a sunny day with high temperature and drought. It is best to do it in the morning or evening on a cloudy day or after rain.

3. The method of fertilization must be appropriate

The concentration of fertilization should not be too high, and too much should not be applied at one time. Water or apply light water and fertilizer in the morning and evening, and never spread chemical fertilizers between the seedling rows. Water and fertilizer can be applied after loosening the soil and weeding.

4. Pay attention to the prevention and control of diseases and insect pests

Summer seedlings are prone to blight, root rot, leaf-eating, bud-eating pests and other diseases and insect pests. When blight and root rot occur, you can spray 1500 times of thiophanate and thiophanate methyl and other drugs to control them; when leaf-eating and bud-eating pests occur, you can spray 600 times of trapper and other agents to prevent and control underground pests. For example, grubs, mole crickets, crickets, etc. can be sprayed with Green Green and then watered, or they can be captured manually. At the same time, the prevention and control of white moths must be strictly done (confidential moth-killing insecticides).

5. Timing and setting of seedlings

Thinning should be done after rain or irrigation. Seedlings that are too dense, grow poorly, are not fully developed, are injured, have diseases and insect pests, and "overlord seedlings" that affect the growth of most surrounding seedlings should be thinned out promptly. For fast-growing broad-leaved trees, seedlings can be thinned out 1-2 times, and for slow-growing broad-leaved trees, seedlings can be thinned out in time. Coniferous species such as cypress should not be planted too early. They can be thinned 2-3 times before planting. After thinning, it is best to irrigate with dilute manure water to improve the survival rate of the seedlings.

6. Shading is also critical

Excessive temperature is not conducive to the growth of seedlings. After shading, the surface temperature can be reduced by about 10℃. Therefore, where conditions permit, seedlings should be shaded to facilitate the growth of seedlings.

Newly planted trees in early spring can generally stretch out their branches and leaves at the beginning of the growing season. However, some of the plants are not truly alive, but "falsely alive". Once the temperature rises and moisture is lost, This kind of "fake living" plant will wilt, and if not rescued in time, it will die during the high temperature and drought season. Therefore, the survival of newly planted trees cannot be determined until at least the first year of high temperature and drought.