Raising the temperature of the greenhouse should be done well when building the greenhouse. According to the local latitude, choose the appropriate greenhouse height and the angle between the film and the ground to optimize the solar thermal effect. The cover of the greenhouse must be effective and impractical. If necessary, add a straw curtain or install a hot stove at the corner of the sunny side to increase the night temperature inside the shed. In addition, the surface of the shed film must be regularly cleaned to increase the light transmittance. Grasp the sensitivity of different vegetable varieties to temperature, according to the local climatic conditions, select the appropriate sowing date and planting period, in the face of special weather, take cold measures as far as possible to protect vegetables from cold damage.
The use of variable temperature management in nursery should be implemented according to the development requirements of seedlings in the seedling stage of fruit and vegetable vegetables to cultivate strong seedlings. Generally, after sowing, the temperature should be raised. After emergence, the temperature should be lowered to avoid leggy growth. After sub-seedling, the temperature should be raised again to promote the growth of new roots; then the temperature should be reduced before planting to increase the cold resistance of the plants. In the cultivation of tomato seedlings, when the flower buds are differentiated (usually after two true leaves), the temperature at night is appropriately increased to keep the night temperature at about 15°C as much as possible to prevent the occurrence of malformed fruit.
Do a good job of temperature, moisture and nutrient management to control the temperature of the greenhouse. When it is sunny, avoid overheating of the greenhouse. Especially when the temperature of the greenhouse is too high, release the air slowly to avoid sudden fluctuations in room temperature. In cloudy days, it is necessary to appropriately shorten the time for exposing the curtains, reduce the number of entrances and exits to the sheds, and keep the temperature of the sheds as stable as possible. Avoid using cold water to flood the plants that thrive during periods of high greenhouse temperature. In the case of yellowing caused by continuous cloudy days, 0.5% to 1% sucrose plus 0.1% to 0.3% potassium dihydrogen phosphate mixed solution can be used for nutritional supplementation. When a continuous cloudy day causes plants to burp, they generally cannot water. If the weather starts to turn and the soil is dry, when watering is necessary, use a kettle to warm the water. Never use cold water to flood the area. To prevent the plants from being exposed to the sun during a long period of sunshine, you can use the method of backsliding or interval to avoid the sudden high temperature. When the cucumber appears to have a flower topping, some of the juvenile melons may be properly removed to facilitate shoot elongation. In addition, spraying high-efficiency foliar fertilizers to enhance the growth of vegetables will help increase the cold resistance of the crops.
Do a good job of preventing smoke or pouring night water before cold temperatures appear. When the weather forecast will appear cold weather, timely release of smoke can use its drift, coverage under the inversion layer, to prevent large amounts of radiation at the ground temperature, in order to increase the temperature. You can also use the method of pouring night water, this measure is generally carried out late in the evening, when pouring, you need to control the amount of water, so as not to affect the temperature.
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