The temperature of winter greenhouses mainly comes from the sunlight, so in the management, reduce the humidity in the greenhouse, increase the penetration of sunlight, increase the ground temperature and the temperature in the greenhouse, do warm work, prevent heat loss, and increase crop resistance. Resist cold, achieve the purpose of increasing production and increasing income. After years of practice and theoretical study by China Agricultural Network, the following points are summarized: First, change the way of release The scientific and rational release of wind has a great influence on the growth of vegetables. Now many farmers and friends are releasing the straw curtain when the temperature is high at noon, or after opening the straw curtain in the morning, opening the air outlet to release moisture from the shed, and then closing the air outlet after a while The temperature in the greenhouse can't be wrong with this ventilation method, but it is often not effective and the yield of vegetables grown is not high. Therefore, in order to change the way of releasing air, as the vegetables in the greenhouse are stopped from photosynthesis, only a large amount of carbon dioxide is released through respiration. At the same time, microorganisms in the soil decompose the organic matter and release carbon dioxide. After the night, the accumulated carbon dioxide content in the shed increases significantly. Because of the carbon dioxide content in the outside atmosphere, we will not release the air within one hour after the curtain is opened the next morning. Let the vegetables undergo photosynthesis after receiving the light, fully absorb the carbon dioxide in the shed and convert it into storage. The organic matter in the fruit waits for about 20 to 30 minutes after the carbon dioxide consumption in the shed is about the same time, and the wind and typhoon are reduced. The humidity in the shed is reduced, harmful gases in the shed are discharged, the penetration of sunlight is increased, and the temperature in the shed is accelerated. Raise while supplementing carbon dioxide. Put 20 to 30 minutes of small winds and bleeds before putting it to sleep in order to reduce the humidity in the shed. At noon in principle, do not let go of the wind, try to increase the temperature within the shed, but if the temperature is too high in the noon shed (fruit vegetables more than 35 °C, leafy vegetables more than 30 °C) still have to let go. In addition, the air release should also be based on the weather changes, when the outside temperature is low, it may be appropriate to postpone the release of air or not to ventilate the main greenhouse insulation, in order to avoid the cold temperature caused by sudden drop in the greenhouse. Second, reduce the area of ​​bare ground in the shed Exposure of bare ground to sunlight will cause large amounts of water to evaporate. The evaporation of moisture not only increases the humidity in the shed, but also consumes a lot of heat. Therefore, in winter, the crop must be covered with a transparent plastic film, so that the sun can irradiate the soil through the plastic film, which will help the soil absorb heat and increase the ground temperature. Other exposed ground must be covered with rice husk or rice straw to reduce bare land area. , reduce the evaporation of moisture. Third, try not to water, less irrigation In the winter shed, it is best to use the drip irrigation method under the membrane to save water, which not only reduces water evaporation but also reduces water evaporation. So when do you need water? The simple method is to hold the soil by hand. After loosening the hand, the soil will form two or three pieces of soil, indicating that the soil moisture content is just right, and no irrigation is required. Only after loosening the hand, the soil flows smoothly and needs irrigation. Fourth, keep the film clean At the very least, the front window of the greenhouse must be kept clean. Especially before and after the winter solstice, the high-yielding cultivation techniques of vegetable soybean soybeans are even more important. The cleaner the membrane, the more sunlight enters, the higher the temperature in the shed, and the more photosynthesis, the higher the yield. Fifth, reduce the loss of heat in the shed In the evening, we will set up a haystack in the corner of the greenhouse. We will set up two curtains in the shed (which must be opened during the day) so as to reduce the loss of heat in the shed. VI. Preventing crops from freezing Temporary heating equipment must be prepared in the shed to temporarily warm it in cold weather or on a continuous cloudy day to prevent crops from freezing. Seventh, in the case of continuous cloudy days As long as there is no obvious frost on the shed film, it is necessary to uncover the grass worms and cover them early. The scattered light can still increase the temperature inside the shed. After the evisceration, it is necessary to pay attention to changes in enthalpy temperature. If they fall, they should be covered immediately. A slight pick-up can cover the grasshoppers before 2pm, in order to prevent the nighttime temperatures from falling too much. If conditions permit, you can use incandescent lamps to add light. Hang a 30 to 40 watt incandescent lamp every 20 square meters and fill the light for 4 to 8 hours a day. It is also possible to reflect some scattered light with a reflective screen, and use a polyester aluminized film to splice a reflective screen that is 2 meters wide and 3 meters long. The reflective screen is hung on the upper end of the post post and hangs down to the ground to increase the light intensity on the ground. 43%, the greenhouse temperature increased by 3~4°C, and the ground temperature increased by 1.8~2.9°C. 8. Straw Bioreactors Straw is transformed into the CO2, heat, disease spores, enzymes, organic and inorganic nutrients needed for plant growth under the action of microbial strains and the like. The built-in straw bioreactor can increase the ground temperature by about 2°C, which is regarded as the fundamental solution to the low temperature in winter. At the same time, it can also increase the carbon dioxide concentration in the greenhouse, organically improve the soil, biologically control pests and diseases, and achieve high yield, quality and organic produce. Nine, increase crop resistance and resist cold The method of foliar fertilization is generally adopted. In 20 liters of water, 20 to 25 grams of urea, 20 to 30 grams of potassium dihydrogen phosphate, and 20 to 30 milliliters of rice vinegar are uniformly sprayed. If the color of the crop is shallow, more urea can be added. Can play vinegar alone. Through the above measures, the humidity in the greenhouse is reduced, the occurrence of diseases is reduced, the temperature is raised, the resistance of the crop is enhanced, and the goal of high yield and high efficiency is achieved. Pvc Portable Resuscitator,Pvc Transparent Respirator ,Simple Respirator,Emergency Resuscitator Jiangsu Yongle Medical Technology Co., Ltd. , https://www.jsylmedical.com