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Tartaric Acid, Vanillin, Menthol, Menthol Crystal, Flavoring agent, Baking powder Xi'an Gawen Biotechnology Co., Ltd , https://www.ahualynbio.com
Covering grasshoppers (grass curtains) Protecting grasshoppers (grass curtains) have low thermal conductivity and good protection against cold. In production, straw and other straws are used to make grasshoppers (grass curtains), and according to local conditions, the temperature of the day can be uncovered. (The temperature of the greenhouse after 1 hour of cover is appropriate at about 18°C, and the temperature is higher than 18°C ​​and less than 18°C. °C early cover). In the cloudy snow evening, a layer of cold-proof plastic film is covered outside the grasshopper (grass curtain), which can increase the temperature in the shed by 2°C to 3°C. If nursery seedlings are raised in the shed, then a small arch shed should be built on the seedling hoe. The use of multi-layer coverings will better protect the larvae. In the cold before the onset of the advent of frost ash in the rows, spread rice husks, rice straw, distiller's grains, etc. can raise the ground temperature seedlings.
Artificial warming, supplemental lighting, greenhouse vegetable production is not afraid of cold, it is afraid that even the lack of sunshine on cloudy snow days. Therefore, enhancing and supplementing the light in the shed is very important for ensuring the normal growth of the vegetable plants. The method is to hang a reflective film on the back wall of the booth to increase the light intensity of the cultivation bed. It is also possible to install electric lights in the shed. In the case of low light on cloudy snow days, turn on the lights for about 3 hours sooner or later. (Note that it is necessary to guarantee about 8 hours of darkness at night). In this way, the temperature in the greenhouse can be increased and photosynthesis of vegetable plants can be promoted. When the temperature in the greenhouse falls to the minimum temperature required by the vegetables, the temperature should be increased (using a hot air stove or an ordinary stove), but care should be taken not to raise the temperature of the greenhouse too quickly. In addition, it must be noted that the flue must be airtight, to prevent smoke from permeating the shed and causing damage to vegetables. For nursery greenhouses, hotbeds can be used when cultivating seedlings, such as electric hotbeds. The bed is used for seedlings.
During the cold season of the air conditioning in the greenhouse, due to the low temperature and low ventilation and ventilation, the shed interior is almost in a closed state, so it is easy to cause excess oxygen and carbon dioxide in the air, which has a great influence on the respiration of vegetable plants. This can use carbon dioxide fertilization techniques, such as smoke, sulfuric acid and ammonium bicarbonate reaction and other methods to adjust the indoor air composition, supplement carbon dioxide content. In this way, the cold resistance of vegetable plants can also be enhanced.
Foliar spraying fertilizer solution in the low temperature, weak light conditions, greenhouse vegetable roots to absorb nutrients greatly reduced capacity, especially after the freeze suffered a basic atrophy of leaves, photosynthetic ability to produce nutrients even worse. At this point, it should be used as little or as little as possible to grow hormones, but use the method of spraying fertilizer solution to be solved. For example, spraying a mixture of potassium dihydrogen phosphate, 100- to 300-fold rice vinegar, white sugar and superphosphate in a concentration of 0.3% can supplement the nutritional deficiency of vegetable plants and increase the hardness and sugar content of the leaf meat, thereby increasing the vegetable resistance. Coldness and the degree of harm to mitigate freezing injury.
Irrigation and mulch protection Under normal circumstances, the damage caused by lack of water in greenhouses is mostly caused by water shortage. During the critical period of vegetable growth, clear weather is selected (temperature is above 20°C). Membrane submerged irrigation or drip irrigation is used to fill soil moisture and prevent freezing injury. This is because the specific heat of water is higher than that of air, heat is slow, the moisture content of the soil in the greenhouse is moderate, and the heat preservation performance is good. The root system of vegetable plants can be free from freezing damage.
Strengthen snow management After the snow is cloudy, when the outdoor temperature is around -10°C, the temperature inside the shed is generally around 16°C, and the temperature difference between inside and outside is relatively small. However, once the weather is clear, the temperature in the shed indoors can rise above 30°C. At this time, many people think that this is the best time for a long-term warm growth and should not let off. In fact, the air should be repeatedly ventilated at this time, so that the indoor and outdoor temperature difference between the shed and the previous few days, and then slowly warming, so that the vegetable plants have a process of adaptation to the environment in order to restore normal growth. Otherwise, it will cause "10-day suppression, 1 day-long growth" and flash sprouting, so that it will be more prone to frost damage when it cools down again. In addition to the use of unfolding to control, it is necessary to spray foliar fertilizer immediately to supplement crop nutrition, enhance plant resistance, and promote growth and development.
Prevention of freezing injury will reduce the resistance of vegetables and induce the infection of pathogenic bacteria. After cooling, they should be sprayed or fumigated with aerosol to prevent the occurrence of diseases.
The chicken manure and cow dung that are decomposed in the hot soil layer are good thermal organic fertilizers with good air permeability. Before transplanting vegetable seedlings in the greenhouse, the soil may be fertilized at a ratio of chicken manure: cow dung: soil = 2:2:6. Because of the endothermic and heat-generating properties of this mixed-formulated growing layer, it is very beneficial to the development and growth of the roots of the seedlings.