As the weather turns cold and the light becomes weak, many vegetable farmers are preparing to change membranes for the greenhouse. However, some inappropriate practices of vegetable farmers in replacing greenhouse films are not conducive to extending the service life of greenhouse films.
Misunderstanding 1: Do not pay attention to the maintenance of bamboo rafts before changing the membrane. The bamboo raft in the greenhouse shall bear the heavy pressure of grass rafts, and the load-bearing weight will increase greatly when snow meets the weather, which will cause part of the supporting bamboo rafts to be crushed or broken. Such bamboo rafts must be maintained or replaced in time. For bamboo rafts that have been pressured off, they can be removed and replaced, or attached to a broken bamboo raft. The original broken part is wrapped with cloth to prevent it from being punctured. Only bamboo rafts that can continue to be used in rips can be wrapped with cloth.
Misunderstanding 2: The east-west steel wire is directly pressed on the gable. When installing east-west laminar steel wire for greenhouses, some vegetable farmers directly press the steel wire on the gables. When the tight wire machine is used to crush the steel wire, the steel wire will be drawn into the gable, which is not conducive to fastening. It is recommended to use scrap tires or soles on the bottom of the gables to expand the stress area of ​​the steel wire and prevent it from being pulled into the gable.
Myth 3: The film rope is directly pressed on the film. When a vegetable farmer presses the film rope north-south to the shed film, if the film rope is pressed directly onto the shed, the film rope will oscillate when the grass rake or wind is pulled. As time goes by, the shed will be The shed film at the turning point in the front of the greenhouse was worn. It is recommended that the vegetable farmers put rags, rubber hoses, PVC pipes, etc. on the sheds and front corners, or put plastic hoses on the film ropes to avoid direct contact between the film ropes and the shed film and reduce the pressure film ropes. The friction of the film can slow down the wear of the film.
Misunderstanding 4: Remove the old film prematurely when changing the film. Some vegetable farmers in the change of membrane, used to remove the old film first, until the wire on the shelf, bamboo rafts and other maintenance or replacement, and then replace the new film. During this time, the temperature and humidity in the shed changed drastically, and some pests from the outside world took the opportunity to fly into the shed, thus laying hidden dangers for the occurrence and spread of some diseases and insect pests. Therefore, we must shorten the time taken for the removal of the old film to the new film. It is suggested that the bamboo shoots to be changed by the vegetable grower should be prepared in advance, and the new film should be laid in front of the shed. The old film should be removed, and the bamboo shoots that need to be replaced should be replaced immediately and the new film should be covered.
Myth 5: Ventilation zone uses inferior membrane or old membrane. In order to create a suitable environment for the growth of vegetables and to ensure proper temperature in winter sheds, vegetable growers generally use better-quality shed films, but often use inferior films or old films for leeways on the top of greenhouses. Inferior membranes and old membranes have poor mist eliminativeness in winter, and are prone to dew when vented, resulting in high humidity in the shed, which is not conducive to disease prevention and control. It is recommended to replace the membrane on the ventilation belt once a year and replace it with a membrane with good quality and good mist-removing ability.
Misunderstanding 6: There are no coverings at the two gables. After the shed film was covered, some vegetable farmers did not install coverings on the shed film at the two gables in time. When a vegetable farmer pulls a haystack, most of it will be shed from the gable wall, which will easily break the shed film here, and the shed film on the gable wall will be in direct contact with the soil and will be more susceptible to erosion, affecting the heat preservation and service life of the greenhouse. It is recommended to cover the old grass weeds on the two hills immediately after the replacement of the shed film and press them with bricks or old cement pillars to prevent the vegetable farmers from knocking the shed film down when they come in and out, and on the other hand to prevent vegetable farmers from raining and snowing. The upper and lower sheds are slippery and easy to walk.
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