At present, the open field vegetables grown in the field are kale, green vegetables, snow vegetables, mustard, cauliflower, broad beans, peas, celery, heading cabbage, yellow sprouts, carrots, onions and garlic. First, in terms of management, we should do a good job in shallow ploughing, soil cultivation, weeding, topdressing, and timely drainage after rain. Second, cauliflower, Chinese cabbage, yellow sprouts, carrots, onions and garlic can be harvested and listed in batches in time, while doing a good job of anti-freezing and heat preservation, covering the floating surface or small arch shed with straw, greenhouse film, sunshade net or non-woven cloth at night when the temperature is low, and rice straw bundles are used for heading Chinese cabbage to ensure the compactness of the ball and avoid frostbite.
The main function of the car sunshade is to reduce the temperature in the car and prevent the sun from reaching the objects in the car directly. Sunscreen is a combination of multi-layer bubble film and aluminum foil, which belongs to a kind of plastic products. Bubble film has good strength, toughness and impact resistance. Aluminum foil has the ability to reflect light, thus reducing thermal radiation and has low thermal radiation conductivity. When the sun shines on the sunshade, some of the heat will be blocked, and the ultraviolet light will be reflected by the aluminum foil. If you park for a short time, you can use a simple sunshade in the front windshield of the car, which is more durable and practical. The effect of shading is better.
In a good greenhouse, it also requires careful daily maintenance. It takes longer to use it. The covering material of the multi-span greenhouse is generally sunny board or glass, and the thermal insulation performance is also very good, but the interior of the multi-span greenhouse is also equipped with heat preservation measures, which is called internal heat preservation in the industry, which is a very thin waterproof quilt. It is different from the heavy quilt in the solar greenhouse. The multi-span greenhouse thermal insulation is installed at the top and around the indoor, and the multi-span greenhouse adopts the form of internal thermal insulation. The configuration of the multi-span greenhouse belongs to the greenhouse industry, and both external sunshade and internal thermal insulation are configured. Places like the northeast have to be equipped with internal thermal insulation. But it is not called thermal insulation, the thermal insulation of the traditional solar greenhouse is covered outside the greenhouse, but the thermal insulation of our multi-span greenhouse is inside the multi-span greenhouse, and the general installation location is at the top.
Secondly, the car sunshade protects the vehicle instrument equipment. Direct sunlight will make the temperature in the car as high as 70 degrees, not only the shell of the center console is easily deformed, but also the instruments and audio equipment on the dashboard will be damaged by high temperature, such as aging parts, unsoldering pins and so on. Sunshades can effectively avoid direct sunlight.
1, the choice of car sunshade material is now the most on the market is aluminum film pvc material, aluminum film material effectively reflect light and internal PVC bubbles effectively insulate the conduction of thermal energy, can play the role of thermal insulation and cooling. So the size of the aluminum film and the thickness of the pvc material determine the effect of use. When buying this kind of sunshade, it is best to choose a model with a sucker, although it will take more time to place each time, but the model without a sucker is more likely to fall from the inside of the glass, which loses the meaning of using sunshade. It is recommended that we try to choose thicker ones when buying, and the effect is definitely better than the ordinary ones.