Gradually training seedlings before planting in greenhouses can improve the resistance of seedlings to adverse environments. After the exercise, the cold resistance and drought resistance of the seedlings increased, and the seedling period after planting was short.
Gradually training seedlings before planting in greenhouses can improve the resistance of seedlings to adverse environments. After the exercise, the cold resistance and drought resistance of the seedlings increased, and the seedling period after planting was short. The specific method is as follows:
Gradually reduce the temperature in the nursery site 7 to 10 days before planting, control the water, stop heating, if you use the electric heating line to raise seedlings, should stop the power, gradually increase ventilation, and gradually remove the covered straw, to the first 3 before planting ~ 4 days should be completely removed. The air temperature in nursery sites is controlled at 15°C～20°C during the day and 5°C～10°C at night. Generally, do not water this period of time. If there is a phenomenon of wilting in the individual seedlings in the middle of the noon, you can only pour some water in the wilting areas at any time, so that the seedlings can be eased. Don't water a lot, and prevent the seedlings from getting too long due to high humidity.
During the training seedling stage, it is necessary to prevent the seedlings from causing freezing damage. Should always pay attention to listening to the local weather forecast. When there are cold currents, cold insulation should be done at any time. In order to prevent cold damage during seedling stage, the cold resistance of seedlings should be improved, light intensity should be increased, water should be controlled and rational fertilization should be applied. At the same time, pay attention to the cold insulation work, especially the cold weather, should pay attention. It should also prevent snow and rain from seeping into the seedbed. In the morning, we must pay attention to changes in seedlings when we uncover the straw and find that the seedlings are slightly frost-damaged and timely measures should be taken.
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