First, nutrition seedlings nursery. The black plastic nutrition bowl has the functions of absorbing heat during the day and protecting the roots at night. In the Yangshuo, plastic nutrition seedlings are planted. When the ambient temperature is around -10°C, the temperature inside the bowl is 6-7°C, and the temperature inside the bowl is 10°C. Around, the seedlings can grow slowly, free from frost damage.
Second, cultivation of hot nutrition soil. Chicken manure is hot feces, cow dung is a mucus-rich, breathable manure, 20% each when decomposed, and 60% mixed with Yangyang. This nutrient soil has good heat-absorption and heat-generating properties. The seedlings have a good ecological environment and the number of roots. It is long and strong, and it has strong absorptive capacity.
Third, rooting with rooting ingredients. The rooting element is reasonably formulated with calcium, phosphorus, zinc and other long-root related nutrient elements. Calcium determines the thickness of the root, phosphorus determines the number of roots, and zinc determines the growth rate and length of the root system. After use, the root system can increase by about 70%, the deep root by 25%, the root system is advanced, the absorption capacity increases by about 70%, and the deep root increases by 25 %, with well-developed root systems, about 70% increase in absorption capacity, 25% increase in deep roots, well-developed root systems, and strong absorptive capacity. It will not cause cold-resistance and frostbite damage due to water shortages.
Fourth, foliar spray nutrients cold. Cold winters, low temperatures, weak light, weak root absorption capacity, and sprayed photosynthetic fertilizers on leaves, can compensate for the lack of nutrients caused by insufficient nutrients in the root system. Foliar sprayed rice vinegar can inhibit bacteria and insects, and mixed with sugar and superphosphate, can increase the degree of sugar and hardness of mesophyll, and improve cold resistance. After freezing damage, the leaf surface is basically atrophic, and vinegar can ease the damage. It is recommended to use 100-300 times liquid. Use less or no growth hormones to prevent cold resistance.
Fifth, the water insulation to prevent freezing. The specific heat of water is higher than that of air, and the heat dissipation is slow. In winter, the indoor soil moisture content is moderate, the pores of the cultivation layer are finely cracked, the root system is not suspended, the soil is kept warm, and the root system is free from freezing damage. Therefore, seedlings are mostly due to lack of water due to frost damage. For this purpose, pouring sufficient water before winter or selecting good weather (water can be watered above 20°C) can prevent freezing.
Six, cultivator insulation and cold. The ground panel knots, during the day when the hot gas enters the tillage layer is limited, the soil heat storage is small, and the cracks in the compacted soil are large and deep, the granule structure is poor, the former night is easy to lose heat, and the lower temperature at the latter part of the night is easy to cause freezing damage. Shallow cultivator can break the ground and cracks, not only can control the transpiration of groundwater to take away heat energy, but also keep warm and protect cold and keep seedlings.
Seven, sunny days repeatedly release the wind. The outside temperature of standard greenhouses with good performance of refining is around -10°C. The maximum indoor temperature in sunny winter morning can reach above 32°C. Many people think that this is the best period for long-term freezing and long-term warming, and should not be let off. In fact, it should be repeated at this time, so that the temperature difference between indoor and outdoor to pull small, close to the room temperature a few days ago, so that the plants slowly adapt to the environment, robust growth, beware of a long day, ten days cold, causing flash seedlings and frost damage.
Eight, add carbon dioxide. The ratio of carbon and ammonia production to crops is 1:1, and the ratio of crops to carbon to nitrogen ratio is 30:1. At present, most farmers are aware of the role of nitrogen in increasing production, but they have neglected the effect of increasing carbon production. Winter vegetables in greenhouses tend to grow yellow. One hour after the sun comes out, carbon dioxide produced by night crop respiration and soil microbial decomposition can be absorbed. At around 12 o'clock, it is in a state of carbon starvation. When the temperature is high, the greenhouse film can be opened and closed. External carbon dioxide increases resistance and yield. Closing the greenhouse when the temperature is low, artificially supplementing carbon dioxide, can increase the cold resistance of the crop; significantly increase production.
Nine, cover and keep warm. The general wall is 1 meter thick. During the day, heat storage temperature, the release of energy at night accounted for 50% to 60% of the total indoor, soil heat absorption accounted for 20% to 30%, space heat accounted for 20% to 30%, according to the winter and the day temperature, after the cover The room temperature of 1 hour may be maintained at about 18°C. If it is higher than 18°C, it may be covered later. If it is lower than 18°C, it will be covered earlier.
Tenth, the wall hanging reflective film temperature. The winter production of greenhouse vegetables is not afraid of cold, fear of light, fear of even cloudy days. Therefore, before and after the winter solstice, a plastic film reflecting on the back wall can increase the light intensity of the cultivation bed, and at the same time, slowly release the heat energy stored in the wall in the room, so as to maintain a higher temperature in the middle of the night to prevent freezing and damage of the seedlings.
Black and White Ultrasound Scanner
"Black and White Ultrasound Scanner" is to emit ultrasonic waves, so that the ultrasonic waves encounter barriers to generate echoes, use the computer to collect these echoes, convert them into corresponding images and display them on the screen, and the images measured by the ultrasonic probe are black and white, so it is called " Black and White Ultrasound Scanner" is also the earliest diagnostic technology adopted by b-ultrasound.
"Black and White Ultrasound Scanner" has the advantages of non-invasive, high sensitivity, low cost and convenient operation
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Mianyang United Ultrasound Electronics Co., Ltd , https://www.uniultrasonic.com