As the weather turns cold and the light becomes weak, many vegetable farmers are preparing to change membranes for the greenhouse. However, some improper practices of vegetable farmers in the replacement of greenhouse films have caused hidden damage to the shed film, which is not conducive to extending the service life of the shed film. From the point of view of production problems, there are mainly the following points: First, do not pay attention to the maintenance of the supporting film bamboo before changing the film; Second, the east-west direction of the steel wire is directly pressed on the gable; Third, the film rope is directly pressed on the film. Fourth, remove the old film when the film is removed too early; Fifth, use the inferior film or the old film in the ventilation belt; Sixth, there is no covering at the two gable film. In response to these problems, the author believes that the key tasks that vegetable farmers should focus on when changing membranes and routine maintenance are: 1. Timely replacement of damaged bamboo poles: The bamboo poles of greenhouses are subject to the heavy pressure of grasshoppers. When the heavy snowfall weather is encountered, the bearing weight is greatly increased, which can cause part of the supporting bamboos to be crushed or broken. Such bamboo rafts must be maintained in time or replace. 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. 2. The bottom of the steel wire on the gables is used to dispose of used tires or shoe soles, etc., to increase the stress area of ​​the steel wire and to prevent the wire from drawing into the gable. 3. 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 and sheds. The friction of the film slows down the wear of the film. 4. Be sure to shorten the time taken for the removal of the old membrane to the new membrane. Now farmers are a number of partners to help each other to change the membrane, can be prepared in advance to replace the bamboo raft and other preparations in advance, the new membrane in the shed, then remove the old membrane, immediately replace the need to replace the bamboo raft, the new membrane Overlay, thus shortening the change of film time. 5. Inferior membranes and old membranes have poor demistability in winter and are prone to dew when vented, resulting in high humidity in the shed, which is detrimental to disease prevention and control. It is recommended that the membrane on the venting belt be replaced once a year and replaced with a membrane with good quality and good mist-removing ability. 6. When the vegetable farmer pulls the haystacks, most of them will be shed from the gables, which will easily break the shed film here, and the shed film on the gables will directly contact the soil, which is more likely to be eroded and affect the insulation 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. Magnesium Fluoride CAS No. 7783-40-6 Magnesium Fluoride Basic Information Blood Plus Magnesium Fluoride,Fluoride Blocks Magnesium Uptake,Fluoride Reacts With Magnesium,Magnesium Fluoride ShanDong YingLang Chemical Co.,LTD , https://www.sdylhgtrade.com
Product Name: Magnesium fluoride
CAS: 7783-40-6
MF: F2Mg
MW: 62.3
EINECS: 231-995-1
Magnesium Fluoride Chemical Properties
Melting point 1248 °C
Boiling point 2260 °C
Density 3.15 g/mL at 25 °C(lit.)
Refractive index 1.365
Form random crystals
Color White to off-white
Specific Gravity 3.15
Water Solubility 87 mg/L (18 ºC)