How to maintain the bad greenhouse film in winter
Shed film, as the main facility for heat insulation and light transmission in winter, is self-evident. In recent years, vegetables have grown poorly due to problems such as reduced transmittance of the greenhouse film, dripping water, etc., and there have been cases of reduced or even lost production every year. In the winter season, how should the film be maintained and managed? Disclaimer: Some articles on this website are transferred from the Internet. If you have third party legal rights, please inform this website to deal with them. phone Hidden Safe Box,Bedroom Safe Box,Intelligent Safe Box,Cash Box Hebei Yingbo Safe Boxes Co.,Ltd , https://www.ybsafebox.com
Shed film dripping water is not important to the deep winter season, the temperature difference between the indoor and outdoor is large, the light time is short, the ventilation time is very limited, causing the humidity in the shed to be maintained above 95% for a long time, and dew is easy to form. When building a new shed, pay attention to improving the structure of the shed and increasing the angle of the shed. Choose a high-quality non-drip film, and when the new film is put on the floor, the film is pulled tight.
Choose a new shed film when it is sunny and windless, and the temperature is high to solve the problem of shed film dripping. If the outside temperature is already very low, and the maximum temperature is below 5 ° C, it is not suitable to replace the shed film in the shed. It is necessary to find a way to reduce the impact of the drip of the shed film on the vegetables. Spray-free agents such as silicone additives can be sprayed on the inside of the film to improve the ductility of the film surface and avoid the formation of dew drops. Pay attention to ventilation before spraying. After the water droplets on the greenhouse film dry, spray evenly on the surface of the inner membrane of the greenhouse. Spray 120 ~ 150ml of liquid per square meter of film.
Do a good job of removing dust from the shed film to improve the light transmittance. Select a shed film with good dust resistance, which is the basis to ensure that the shed film has less dust. The PVC film has poor dust resistance, and the shed film has good light transmittance before and after it; the EVA film has good dust resistance, and the shed film has good light transmittance. . It is recommended that vegetable farmers prioritize PO film.
At present, the best dust removal measures are dust strips. The dustproof tape can be made with long cloth strips, etc. One end is fixed to the roof of the shed and the other end is fixed under the shed. When installing the dust-removing belt, it is best to set up and down steel wires. After the dust-removing belt is set, it can be moved by things, which is convenient for comprehensively cleaning the dust on the shed film. In addition, a water spray device can be installed on the upper part of the shed film. When there is a lot of dust, water can be sprayed to clean the dust on the shed film. Especially on high-temperature arch sheds, dust-removing cloth strips cannot be set, and vegetable farmers can use water spraying to remove sheds to clean the shed film.
Prepare for wind protection and repair damaged winter winds in time. Vegetable farmers currently use nylon ropes for lamination. Farmers are advised to choose nylon ropes with a thickness of about 0.6 to 0.8 cm. The contact area with the shed film is large and the damage caused is small. Generally, a film-pressed rope is set every 1.5 meters. But pay attention to pressing, and pad a soft cloth underneath to reduce the damage to the film caused by the pressing rope and skeleton. In order to strengthen the lamination effect, two horizontal lamination lines can also be set in the east-west direction of the shed film.
With the use of time, the film is easy to break. Vegetable farmers should check the damage of the shed film at any time, and if there are any loopholes or cracks, they should be repaired in time to avoid causing greater losses. For small holes or small cracks, vegetable farmers can use scotch tape to directly paste. For larger damage, the vegetable farmers must first clean up the holes around and use a brush to dip in special glue. After 3 ~ 5 minutes, take a piece of the same The film is affixed to it, and the glue can be applied firmly after drying.
In addition, a floating film is installed on the thermal insulation quilt, which can not only increase the thermal insulation, but also greatly strengthen the wind resistance and prevent the shed film and thermal insulation quilt from being safe.