Winter vegetable cultivation
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A look at the certificate and production date
When buying plastic film, not only depends on product certification, but also to see the shelf life, agricultural film effective warranty period of 1 year, try to buy plastic film closer to the date of production. Because the agricultural film will age over a long period of time, it will shorten its service life and even lose its protective effect.
Second look the appearance quality
Some film on the market due to the aging of production equipment, unqualified raw materials, technology and customs, and other reasons, resulting in film thickness uneven phenomenon, in the use of thin areas prone to damage, affect the insulation effect; some film will appear in the production Watermarks or cloud-like markings, and even bubbles, perforations, cracks, etc., are damaged, and these defects in the mulching film seriously affect the insulation effect of the mulch. Therefore, when choosing a plastic film, check whether its thickness is uniform and whether the pleats are damaged. The film with good quality has a uniform, uniform, silvery white color, consistent transparency, smooth and bright appearance, uniform thickness, and good horizontal and vertical tensile forces.
Three to see the width of the film
To measure the width of the film. Because of different crops, different covering methods require different widths of plastic film, which is too wide to waste and too narrow to be used.
Four to see the thickness of the shop
Because the thickness of the mulching film has little to do with the effect of increasing production, choosing a thick mulch film will increase the investment cost, so a thin mulch film should be used.
Five should ask for an invoice
When buying mulch film, you should ask for an invoice and keep it well to prevent accidents from happening.
Six must calculate the quasi-dosage
Some peasant friends rely on experience to estimate when buying plastic mulches. However, due to the different specifications of mulching films and the different coverage rates of different crops, it is often difficult to correctly estimate how much mulch to buy. In order to avoid blind purchases, the amount should be calculated based on factors such as density, thickness, land area, and coverage of the film. The formula is as follows: G=PHSK
In the formula: G = plastic film dosage (kg); P = plastic film density (kg/dm3); H = plastic film thickness (dm); S = land area (sqm); K = plastic film coverage (%) , is the ratio of the actual coverage of the mulch to the land area.
For example, covering watermelon, the mulch used is a polyethylene material film with a density of 0.91 kg/dm3. If the stencil thickness used is 0.008 mm, the coverage is 80%, the area of ​​the watermelon is 2 mus, and the amount of film used is: G =PHSK=0.91666.721000.0000880%=7.76 (kg).