What does mulch film do for a crop?
Mulch film is a thin sheet laid over soil around plants to conserve moisture, suppress weeds, moderate soil temperature and reduce fertiliser loss. In many Indian cropping systems this improves water efficiency and can raise yields, which is why plastic mulch has spread widely. The film essentially manages the soil surface microclimate.
The catch with conventional polyethylene mulch is what happens at the end of the season. It has to be lifted, cleaned of soil and disposed of, and in practice much of it is burned or left in the field, where it fragments into persistent plastic.
How is compostable mulch film different?
Compostable mulch film is designed to be tilled into the soil at the end of the season rather than collected, where it can biodegrade under the right conditions instead of persisting as plastic residue. This removes the costly and labour-intensive step of lifting and disposing of conventional film, and avoids the open burning that damages air quality and soil.
The practical benefit is a cleaner field and less accumulated plastic over successive seasons. The functional performance during the crop, moisture retention and weed suppression, is comparable to conventional film when the right grade is used.
How should compostable mulch film be applied?
Application is broadly similar to conventional mulch: prepare and level the bed, ensure adequate soil moisture, then lay the film with edges anchored firmly in the soil so wind does not lift it. Choose a film thickness and grade suited to the crop duration, because the film needs to stay intact through the growing season and only begin breaking down afterwards.
Matching film life to crop cycle is the key decision. Too thin and it may degrade early; too heavy and it may not break down cleanly in time. A supplier should help match the grade to your crop and climate.
Does compostable mulch film really break down in the field?
Breakdown depends on soil conditions. Compostable mulch films biodegrade through soil microbial activity, but the rate depends on temperature, moisture and the microbial population, so it is slower and less controlled than an industrial composting facility. Tilling the film into warm, moist, biologically active soil supports breakdown; dry or cold conditions slow it considerably.
Because field conditions vary, farmers should set realistic expectations and select a certified soil-biodegradable grade rather than assuming any compostable film behaves identically in every soil.
Is it worth switching?
For growers who currently burn or bury polyethylene mulch, compostable film removes a disposal headache and reduces long-term plastic accumulation in soil. The upfront material cost is usually higher, but this is offset by saved labour on removal and by avoiding regulatory and environmental risk from burning.
Anjaneya Bio Products manufactures compostable films for agricultural use. The right decision depends on your crop, soil and season, so trial a grade on a small area before committing at scale.
Key takeaway
Compostable mulch film delivers the moisture and weed-control benefits of plastic mulch but can be tilled into the soil to biodegrade instead of being lifted and burned. Breakdown depends on soil temperature, moisture and microbial activity, so grade selection matters.