Cold Prevention of Vegetables
Increase the temperature of the greenhouse This work should be done well when building a greenhouse. According to the latitude of each region, the suitable greenhouse height and the angle between the film and the ground are selected to optimize the photothermal effect of the solar greenhouse as much as possible. The cover of the greenhouse must be effective and impractical. If necessary, add a layer of straw curtains to the bottom corner of the sunny side or install a hot stove to increase the night temperature in the shed. In addition, the surface of greenhouse greenhouse film should be cleaned frequently to increase the light transmittance. Grasp the sensitivity of varieties to temperature, according to the local climate conditions, select the appropriate sowing date and planting period, in the face of special weather, take measures to prevent cold as much as possible to protect vegetables from cold damage. Variable temperature management during nursery In the seedling stage of fruit and vegetables, temperature management shall be implemented according to the development requirements of the seedlings to cultivate strong seedlings. Generally, after sowing, the temperature should be increased. After emergence, the temperature should be lowered to avoid leggy; after the sub-seedling, the temperature should be raised again to promote the growth of new roots; 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. Doing temperature, moisture and nutrient management To control the temperature of the greenhouse, avoid excessive temperature in the greenhouse when it is sunny, especially when the temperature in the greenhouse is too high, release the air slowly and avoid sudden fluctuations in the room temperature. In cloudy days, it is necessary to shorten the time for exposing the curtains, reduce the number of entrances and exits to the greenhouse, and maintain the temperature of the shed as much as possible. To avoid planting plants in vigorous growth with cold water when the greenhouse temperature is high. When yellowing occurs on a continuous cloudy day, 0.5% to 1.0% sucrose + 0.1% to 0.3% potassium dihydrogen phosphate mixed solution can be used to supplement nutrition. 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 sunlight during a long period of sunny days, you can use the method of back squeezing (or squeezing them in intervals, or using back insulation for a long time) to avoid sudden high temperatures. When the cucumber appears to have a flower topping, some of the juvenile melons may be properly removed to allow the shoots to elongate. In addition, spraying high-efficiency foliar fertilizers to strengthen the growth of vegetables will also help increase the cold resistance of the crops. Do a good job of prevention Before the low temperature appears, smoke or night water is poured. This work is suitable for the cultivation of vegetables in the open field. When the weather forecast will appear cold weather, timely release of smoke can use its drift, coverage under the inversion layer, prevent large amounts of radiation at the ground temperature, in order to increase the ground temperature. You can also use the method of pouring night water to increase the temperature of the microclimate of vegetable fields. This measure is usually conducted in the middle of the night. When pouring, the amount of water must be controlled so as not to affect the temperature of the ground. Brain Puzzles For Kids,Best Puzzles For Kids,Jigsaw Puzzles For Kids,Childrens Jigsaw Puzzles Online Eastony Industries (NingBo) Co., LTD. , https://www.eastony.com