Mulch film prevents frost damage by creating a micro-greenhouse effect: sunlight passes through the film to warm the soil during the day, while the film traps heat and prevents loss at night. Experiments show that proper installation can raise surface temperatures by 3–5°C, effectively preventing mild frost. However, additional insulation measures are required during sustained temperatures below -10°C.
Key Installation Techniques
Film Selection: Transparent film offers better warming performance than black film; a thickness of 0.01–0.03 mm is recommended.
Elevated Installation: Using bamboo strips to create an arched space improves insulation efficiency by 40% compared to laying the film directly on the ground.
Edge Securing: Weigh down the edges with soil to prevent air leaks and install anchoring stakes at 1-meter intervals.
Common Pitfalls and Precautions
Light transmittance drops by 30% after 60 days of continuous use; the film should be replaced promptly.
Ventilate by lifting the film after snow melts to prevent excessive humidity from causing disease.
For fruit trees, it is recommended to cover only the root zone; avoid covering the trunk, as heat accumulation there can cause the bark to crack.
