Agricultural polyethylene plastic film, as an essential material in agricultural production, is widely used in scenarios such as ground mulching, greenhouse construction, and anti-seepage lining for aquaculture ponds. The quality of the film and the scientific application of its usage methods directly impact crop growth effectiveness, aquaculture benefits, and production costs. To assist farmers in accurately selecting and properly using agricultural polyethylene plastic film, key points are summarized as follows.  

During the selection process, the principles of **"scenario suitability, quality priority, and balanced cost-effectiveness"** should be followed. First, select the appropriate type based on the specific application:  
- For ground mulching, opt for ultra-thin mulch film with a thickness of 0.008–0.012 mm, which offers good light transmittance and rapid warming, suitable for shallow-rooted crops like vegetables and peanuts.  
- For greenhouse construction, choose long-life weather-resistant film with a thickness of 0.10–0.12 mm. This type of film has strong tensile and puncture resistance and is enhanced with anti-aging agents, providing a service life of 1–3 years.  
- For anti-seepage applications in aquaculture or biogas ponds, select thickened anti-seepage film with a thickness of 0.5 mm or more to ensure sealing performance and corrosion resistance.  

Second, **strict quality control** is essential: high-quality agricultural polyethylene plastic film should have a smooth surface, be free of bubbles and impurities, and exhibit high light transmittance. When pulled by hand, it should demonstrate strong toughness and resist tearing. When purchasing, check the product certification and prioritize reputable brands produced by正规 manufacturers to avoid "unbranded, unlabeled, or unverified" products.  

Additionally, selection should consider **local climatic conditions**: in regions with high temperatures and intense sunlight, opt for film treated with sunblock agents, while in cold regions, prioritize thermal insulation films such as anti-drip or anti-fog films.  

Proper usage methods are crucial to maximizing film performance.  

**First, preparatory work before installation:**  
- For ground mulching, deeply plow and finely harrow the soil, and remove sharp debris such as stones and weed roots from the field to prevent puncturing the film.  
- For greenhouse construction or pond lining, prepare the support frame or pond bottom to ensure a smooth and even surface.  

**Second, installation techniques:**  
- When mulching the ground, lay the film along the crop rows, ensuring it is stretched taut and flat, closely adhering to the soil. Secure the edges by compacting them with soil to prevent wind uplift.  
- For greenhouse film installation, start by securing the film at the frame joints, then gradually extend it to both sides to avoid wrinkles. Overlap the joints and secure them with film clips or straps.  
- For anti-seepage film installation, allow for some to accommodate temperature changes and prevent stretching or tearing. Seams should be sealed using hot-air welding or specialized adhesive to ensure no leakage.  

**Third, maintenance during use:**  
- Regularly inspect the film for damage and repair punctures promptly with specialized tape.  
- For greenhouse film, ensure adequate ventilation during high-temperature seasons to prevent accelerated aging due to heat.  
- After harvesting mulched crops, promptly collect and recycle residual film to avoid soil contamination and interference with subsequent farming activities.  

**Additionally, proper storage methods are essential:**  
- Unused film should be stored in a dry, ventilated, and cool warehouse, away from direct sunlight and damp conditions.  
- Store the film rolled into cylinders to avoid folding or compression, which can cause damage or aging.  

If farmers can accurately grasp the above points when selecting and using agricultural polyethylene plastic film, they can not only enhance agricultural production efficiency but also extend the film’s service life, reduce production costs, and contribute to the green and sustainable development of agriculture. For further details on film selection for specific crops or scenarios, consult local agricultural technology extension departments or正规 agricultural suppliers.