In winter, cold insulation is a key issue for vegetable production in greenhouses. Specifically, vegetable farmers can adopt the following measures to improve the cold resistance of vegetables and increase the temperature in greenhouses so that vegetables can grow normally.
First, foliar spray nutrient cold
Low winter temperatures, weak light, weak root absorption, and sprayed photosynthetic fertilizer on the 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. Use less or no growth hormones to prevent cold resistance.
Second, the foot water insulation antifreeze
The specific heat of water is higher than that of air, the heat dissipation is slow, the indoor soil moisture content is moderate in winter, the pores of the cultivation layer are finely cracked, the root system is not suspended, the soil is warm, and the root system is not affected by freezing. 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.
Third, the cultivator insulation cold
Ground panel knots, less soil heat storage, combined with large and deep cracks in the compacted soil, bad pellet structure, easy to lose heat in the middle of the night, low temperature at the middle of the night, easily cause freezing damage. Shallow cultivator can break ground cracks, not only can control the transpiration of groundwater to take away heat energy, but also can save heat and protect seedlings.
Fourth, add carbon dioxide
The ratio of carbon and nitrogen production to vegetables is 1:1, and the ratio of vegetables to carbon to nitrogen ratio is 30:1. At present, most farmers understand the effect of nitrogen production but neglect the effect of increasing carbon production. In winter, vegetables in the greenhouse tend to grow yellow. After the sun comes out, carbon dioxide produced by vegetable respiration and soil microbial decomposition can be absorbed at 1 hour, and it is in a state of carbon starvation around 12:00 noon. When the temperature is high, the shed film can be opened and closed, carbon dioxide can be put into the outside world, and vegetable resistance and yield can be improved. When the temperature is low, the greenhouse is closed and artificially supplemented with carbon dioxide to increase the cold resistance of the vegetables and increase the yield.
Fifth, cover and keep warm
According to the temperature of the winter and the day when the grass cover is covered, the temperature at room temperature can be maintained at about 18° C. for 1 hour. If it is higher than 18° C., it can be covered later. If it is lower than 18° C., it should be covered earlier.
Six, rear wall hanging reflective film temperature
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 damage. Http://Content/e8f6378c-ade2-49fa-87f1-e99b740f6f83?cType=2
Shenzhen Jie Zhong Lian Investment Co., Ltd. , https://www.meizons.com