Cultivating high-quality cold-resistant and strong seedlings should pay attention to the following issues in the process of vegetable nursery: (1) Uncovering the cover timely. About 70% of the emergence should be promptly revealed cover. The coverings on the small sheds, such as grass weeds, will gradually be uncovered so that the seedlings will gradually see the light. Pay attention to re-covering the cover at night to prevent freezing. (2) timely ventilation and humidity. As the outside temperature and the temperature in the nursery bed increase, it is necessary to increase the ventilation and control the humidity in the nursery facility. When the temperature in the greenhouse is higher than 20°C, the shelter film at the entrance of the greenhouse can be appropriately opened for timely ventilation, and the temperature of the seedbed can be adjusted by using the size of the air outlet and the length of the air release time. In the winter season, the ventilation is usually selected at noon. Ventilation openings are provided on the south side of the facility (leeward side). Avoid ventilation on the windward side. (3) Prevention of seedlings. In addition to timely uncovering the cover, increasing ventilation, prolonging ventilation time, increasing light intensity, and performing low-temperature exercise, Cyanine can be used to inhibit chilling, and chlormequat can enhance the cold resistance and disease resistance of the seedlings. Note that the concentration should not be too large. If the concentration is too large, it can easily cause aging of the seedlings. Strengthen management of greenhouse temperature and light management (1) In light management, facilities should use light-transmitting and heat-insulating cover materials as much as possible. Multi-functional composite films are recommended, especially for seedling-raising films requiring good non-dripability. In the premise of insulation within the facility, cover as soon as possible to cover early, increase lighting time; qualified farmers can also use agricultural fill light artificial fill light. (2) In the aspect of temperature management, appropriate adjustments should be made according to the different requirements of different vegetables and different growth periods for temperature. In winter and spring, the cold insulation of the facility should be particularly well done to avoid adverse effects of sudden cooling of the outside on nursery and vegetable production. In addition to multiple coverage in nursery, if necessary, outdoor facilities such as grass mats and other cold-proof facilities shall be provided on the windward side of the greenhouse. Timely control of pests and diseases Vegetables are prone to damping-off in the early stages of seedling growth. Blight disease is likely to occur later in the seedling growth stage. Botrytis cinerea is easily produced when the temperature and humidity are high. Prevention and control strategies must be adopted in disease prevention and control. In the management, a chemical control treatment is performed once a week, and a wide-spectrum bactericide such as chlorothalonil, carbendazim, and chlorpyrifos is used for rotation. It is recommended to use a fumigant instead of a spray for rainy weather, and good results can be obtained. Do a good job in the management of the hardening period In order to improve the stress resistance of the seedlings and enhance their ability to adapt to external environmental conditions, the seedlings should be cultivated one week before planting, and the ventilation time should be gradually extended every day until the cover is completely removed. Food Process Machine,Food Making Machine,Food Mixer Machine,Power Mixer Guangzhou New Power Catering Equipment Manufacturing Co.,Ltd , https://www.gznewpower.com