At present, it is a critical period for the growth and management of vegetables in solar greenhouses. Effectively coordinate the balance of light, heat, water, and gas in the greenhouse to create a suitable environment for the normal growth of vegetables. First, temperature management (1) Improve greenhouse sealing. Double curtains are placed inside greenhouse greenhouses to plug all gaps and reduce heat release from gaps. (2) insist on multi-layer coverage. In the clear day, the temperature of the greenhouse can generally meet the needs of crop growth. If it is at night, cloudy days and snowfall days, the conditions of the greenhouse can be increased by adding curtains or straw curtains to cover the old shed film and cold-proof cloth on the periphery of the greenhouse. (3) Correctly grasp the time to uncover the straw curtain. Generally when the sun shines on the entire shed (front roof), the curtain can be uncovered. When the temperature reaches 28°C, the air is released. When the temperature rises to 32°C, the air inlet is cooled to reduce the temperature. When the temperature drops to 20°C-22°C, the air outlet is closed. When the temperature drops to 18°C ​​after the tuyere, weave the straw curtain. (4) Excavate the cold ditch. According to the technical specifications, digging the cold-proof ditch at 0.4 meters in front of the greenhouse can reduce the horizontal conduction of soil heat, and can effectively increase the temperature of the front ground. Second, lighting management The illumination time in the solar greenhouse is largely influenced by human factors. To prolong the illumination time, cover as early as possible in the possible range. In the lightest season of light, from late November to early March of the following year, a light curtain can be hung in the greenhouse and the principle of light reflection can be used to increase the light intensity. Clean up the dust on the membrane and keep the membrane clean to increase the light transmittance. Third, humidity management (1) Ventilation and ventilation When the humidity in the greenhouse rises, the temperature rises first (35) and then the air vents are opened to release the air. The size of the air outlet and the time for air release can be determined according to the climatic conditions. (2) Scientific watering Watering of winter vegetables is subject to the principle of “five-watering and five-not pouringâ€. The specific approach is: watering on sunny days, not pouring on cloudy days; watering before noon and not pouring in the afternoon; pouring small water, not much water Flood irrigation; pouring warm water, not pouring cold water; pouring dark water, not pouring water. IV. Gas Change Management Carbon dioxide in the air is the main raw material for photosynthesis of crops. Oxygen acts on the respiration of crops, and ammonia and nitrogen dioxide are harmful to the growth and development of vegetables. In winter, early spring, cloudy days and nighttime, the carbon dioxide content is high. After exposing the curtain, as the temperature rises, photosynthesis is strengthened, and the concentration of carbon dioxide rapidly declines. The use of carbon dioxide gas fertilizer, the application of adequately decomposed organic fertilizer, and the covering of straw on the ground can increase the concentration of carbon dioxide in the greenhouse. V. Severe Weather Management 1. Cold weather management. When the sunny day meets the cold, the outside temperature is very low, but because the greenhouse has a certain insulation performance, it will not suffer from low temperature and freezing damage in a short time. Vegetables will be frozen after continuous cloudy days and strong cooling. In this case, you can use a stove, put in a carbon fire pit, and set up a tungsten-iodine lamp to prevent freezing damage. 2. Snowy weather management. In the event of snowfall, remove snow from the front and rear roofs on the one hand to prevent the heat from being removed by the snow and reduce the indoor temperature. On the other hand, it can prevent damage to the shed due to weight increase. At the same time, the time for pulling the grass curtain can be appropriately delayed. 3. Windy weather management. When it encounters windy weather, it is necessary to do a good job of fixing the straw curtains after uncovering the curtains and covering the curtains. This will prevent the grass curtains from being blown by the wind and promptly reset the straw curtains that are blown by the wind to prevent freezing of the crops due to the low temperature in the room. Cnc Rotary Axis Calibrator,Cnc Rotary Axis Calibration,Machine Tool Calibration Tool,Machine Tool Calibration Instrument Automated Precision Inc. , https://www.apiasean.com