Best Overbed Table,Best Medical Mattress,Medical Bed Accessories,Hospital Bed Accessories Jiangyin Kaili Health-Care Equipment CO., LTD. , https://www.kailimed.com
Second, to change the film before the release vents, strengthen ventilation, so that the temperature inside the shed as much as possible outside the shed. This is very important, because the shed often has higher temperature and humidity than the outside of the shed. If the shed film is directly replaced without first ventilating, it is very easy to cause a "light shed" and it is unfavorable for the growth of vegetables. Therefore, before changing the membrane, it is necessary to pull the air outlet to the maximum and release the air for more than half an hour so as to change the membrane temperature when the temperature inside the greenhouse approaches the temperature outside the greenhouse.
Third, the shorter the time for changing the film, the better. When changing the membrane, try to replace the membrane in the shortest possible time, because the longer the time is dragged, the more the vegetables are affected by the external environment, which is detrimental to the growth of the vegetables.
Fourth, the insecticide should be sprayed immediately after changing the membrane. During the process of removing the greenhouse film, various pests, pathogenic spores, etc. are likely to enter the shed. Therefore, after the replacement of the new membrane, the pesticide should be sprayed immediately to prevent insects from being sterilized. The bactericidal agent may be selected from chlorothalonil, tocopherol, etc., which has a wider bactericidal spectrum. Imidacloprid and buprofezin may be used as the insecticidal bactericide, which has an effect on most pests.
How to change the crop film in the shed
First, choose sunny weather. According to Master Liu, it is very important to choose clear weather when removing the shed film, because it will have the least adverse effect on vegetables. Select the right weather, but also choose to change the time of the film, under normal circumstances, the outside temperature is high at noon when the removal of the most suitable film. At the same time, before changing the film, we must pay attention to observe the size of the outside wind, if the wind is too large, do not change the film first, so as to avoid the wind blow the bad film in the process of changing the film.