At present, early spring watermelons have been planted. In order to improve the insulation effect, the number of layers of the vegetable cover film is now increasing, from the initial two films to seven films. Although the number of layers covered by the film will increase the insulation performance of the arch shed, there are advantages and disadvantages in all aspects. The environmental regulation of the greenhouse under the cover of many membranes will naturally be tedious. If it is not properly handled, the environmental regulation will be unfavorable, which will not only affect the normal growth of watermelon seedlings. It is also easy to cause multiple diseases in the shed and cause losses. So, how can we manage the watermelon seedlings covered by many membranes? The reporter believes that it is very important to regulate and control the environment within the shed. First of all, pay attention to improve the transparency of the film. The more cover film layers, the worse the light transmission, and many farmers are using a number of old films, which seriously affect the transparency of the shed, is not conducive to the growth of watermelon seedlings. Therefore, the arch covered with multiple membranes should do everything possible to increase the light transmittance of the film. One is to use new films as much as possible; the second is to wipe the dust on the outer film frequently; the third is to remove the dew on the film in time to prevent the light from penetrating the film. Second, pay attention to humidity. As we all know, greenhouse vegetable production, insulation and dehumidification is a contradiction. Multi-layered film is covered for heat preservation, and exhausting air naturally is also very tedious. Therefore, farmers should not be afraid of trouble, we must timely and accurately adjust the multi-layer outlet, in order to solve the relationship between good insulation and dehumidification, to create a suitable growth environment for watermelon. In addition, we must pay attention to disease prevention. The environment inside the shed covered by a multi-layer membrane is difficult to control, the humidity is often large, and the disease is very easy to occur. Therefore, we should do a good job in preventing and controlling diseases during this period. When the watermelon is planted (before the film is covered), it can be sprayed evenly with a broad-spectrum fungicide such as chlorothalonil and tocopherol to prevent the occurrence of diseases. After warmly removing the small shed, it should be sprayed again. In order to avoid increasing the humidity in the shed, powder or smoke agent can also be used for prevention and control. Infrared Forehead Thermometer,Portable Infrared Thermometer,Non Contact Forehead Thermometer Gun Dongguan Keyutai Mask Co., Ltd. , https://www.maskkytai.com