What's Happening?
The U.S. Department of Agriculture (USDA) organic standards for biodegradable plastic mulch film are facing scrutiny due to stringent requirements that no current product on the market can fully meet. Since 2012, the National Organic Standards Board (NOSB)
has mandated that biodegradable mulch films must be 100% biobased and demonstrate 90% biodegradation in soil within two years, as measured in a laboratory test. However, a 2023 memo from the head of the National Organic Program confirmed that no known biodegradable mulch film meets these criteria, rendering them 'allowed, but not actually useable' for certified organic farms. This forces organic farmers, who are prohibited from using powerful herbicides, to rely on petroleum-based plastic mulch, which is labor-intensive to remove, difficult to recycle, and leaves plastic residue in the soil. The debate centers on whether the 100% biobased requirement is as crucial as biodegradability for soil health, with many experts arguing that biodegradability is the more important factor.
Why It's Important?
The current USDA organic standards for biodegradable mulch have significant implications for sustainable agriculture and environmental health. By effectively prohibiting truly biodegradable options, the standards inadvertently promote the continued use of petroleum-based plastics on organic farms. This contributes to plastic pollution in agricultural soils, increases landfill waste, and demands considerable labor for removal. Organic farmers are caught between the need for effective weed control, the desire for environmentally friendly practices, and the limitations imposed by current regulations. The inability to use biodegradable mulch also hinders innovation in agricultural materials, as manufacturers have little incentive to develop products that meet an unachievable standard. This situation highlights a disconnect between regulatory ideals and practical realities, potentially undermining the environmental goals of organic farming.
What's Next?
The NOSB is scheduled to review the rules on biodegradable biobased mulch film again in 2027. This review will involve discussions on the required percentage of biobased materials and the criteria for judging biodegradability. Proponents of biodegradable mulch will likely advocate for revised standards that are more aligned with available technology and scientific understanding, potentially emphasizing biodegradability over the 100% biobased requirement. Conversely, some environmentalists may continue to express concerns about the potential for microplastics and other unknown long-term effects on soil health. The outcome of this review will determine whether organic farmers gain access to viable biodegradable mulch options, which could significantly impact farming practices, waste management, and the environmental footprint of organic agriculture in the U.S. In the interim, some farmers may opt to use non-certified biodegradable mulches, conducting their own trials outside of organic certification.
Beyond the Headlines
The challenge with biodegradable mulch film in organic agriculture reflects a broader tension between aspirational environmental goals and the complexities of real-world implementation. The debate over 'biobased' versus 'biodegradable' highlights the nuanced scientific understanding required for effective environmental regulation. While the intention behind the 100% biobased requirement may be to promote natural materials, it overlooks the fact that some petroleum-derived materials can biodegrade more effectively than certain biobased ones. This situation also underscores the need for regulatory frameworks to be flexible and responsive to scientific advancements and market realities. The persistence of plastic in agricultural soils, even from organic farms, raises long-term concerns about soil health, ecosystem integrity, and the potential entry of microplastics into the food chain, pointing to a critical area for ongoing research and policy adaptation.
