Plastic greenhouse vegetable production occupies an important position in the annual production of vegetables, and the weather changes in spring are quite special. Therefore, in the years of cultivation practices, the author summarizes the morning market of greenhouse vegetables, creating seven tips: To strengthen the management of different types of vegetables in different stages of the growth of different external environmental requirements, should be familiar with the understanding of different vegetable growth habits, targeted management. Vegetables require higher soil moisture and lower air humidity (45%-60%) during each growth period. Therefore, in addition to the combination of plastic film covering cultivation methods, but also to strengthen the management of thermal insulation, halfway irrigation should not be large. In advance of the production of warm membranes, the membranes should be detained 15-20 days in advance based on the actual climatic conditions in the area. This has the following advantages: (1) It will help the temperature of the greenhouse and the ground temperature to rise steadily, increase the heat storage of the soil, and slow the growth after planting. rapid. (2) The high temperature formed by the sealed membrane has a certain bactericidal effect, which can make up for the lack of disinfection. (3) It is beneficial to the activities of soil microorganisms, accelerate the decomposition of humus, promote the absorption of crop roots, and achieve early maturation and high yield. Pay attention to increase organic fertilizer and balanced fertilization greenhouse greenhouses should pay attention to increase organic fertilizer, but also a reasonable balance of application of chemical fertilizers, especially to prevent the proportion of soil NPK imbalance. When fertilizing, we must pay attention to the reasonable ratio of nitrogen, phosphorus, and potassium fertilizers on the basis of sufficient organic fertilizer. We must implement balanced fertilization techniques and reasonably match the ratio of nitrogen, phosphorus, and potassium. Selection of new and applicable plastic films The agricultural film materials used in vegetable production are mainly polyvinyl chloride and polyethylene. PVC insulation, anti-droplet effect is good, but the light transmittance decreases rapidly; while the polyethylene film light transmission is stronger than polyvinyl chloride, but the anti-drop effect and insulation are poor. The third-generation functional film EVF three-layer co-extruded agricultural film combines the advantages of polyvinyl chloride and polyethylene agricultural film, has good heat preservation performance, maintains a light transmittance of 60% after summer, and has the same anti-fog effect as polyvinyl chloride. Available in 0.1-0.12 mm thick gauges. The light-transmitting film is effective for promoting the growth of crops and suppressing diseases and insect pests, in particular, the effect of sweetening and increasing yield of melons is obvious. Prevention of late spring cold hazards (1) Strengthen seedling management, cultivate robust plants, and increase plant resistance. (2) The timely irrigation before cold weather can reduce the degree of frost damage. (3) Multi-layer coverage. In the shed, 1-2 layers of small arch sheds can be added, and grass canopies can be added on the outside of the shed to increase the temperature of the shed by 2-3°C. (4) Temporary warming measures. Temporary increase of fire, the use of electric heating wire and other methods. Timely planting vegetables Greenhouses are generally covered with a single layer of film. The ability to increase temperature at night or on cloudy days in the early spring is limited. The greenhouse temperature is only 3-6°C higher than the outside, and inversion may sometimes occur. Therefore, planting should not be premature. If the outside temperature changes can be stabilized for a week, planting and insulation protection work can be done in time. When the temperature in the shed is as high as 38°C, the air should be released in time. The use of suitable plant growth regulators for plant growth regulators can strengthen the root system, reduce the time for seedlings and promote the growth of vegetable plants. ABT4 can be used to increase production spirit, every 0.1 grams add 50 grams of 95% alcohol, plus 10 kilograms of water, for foliar spray or dip root treatment 50-100 kg per mu of liquid. Pumpkin Seeds,Roasted Pumpkin,Raw Pumpkin Seeds,Salted Pumpkin Seeds Wuyuan county dafeng oil food co.,ltd , https://www.dafengfood.com.cn