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A Comparative Plant Growth Study of a Sprayable, Degradable Polyester–Urethane–Urea Mulch and Two Commercial Plastic Mulches
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Researchers compared a new biodegradable sprayable mulch film with conventional polyethylene mulches in a greenhouse tomato growing trial. They found that the biodegradable polyester-urethane-urea film provided similar water savings and crop yields as traditional plastic mulches while avoiding the environmental drawbacks of persistent plastic residues. The study suggests that sprayable biodegradable mulches could be a viable alternative to reduce microplastic contamination in agricultural soils.
The practice in agriculture of spreading polyethylene (PE) film over the soil surface as mulch is a common, global practice that aids in conserving water, increasing crop yields, suppressing weed growth, and decreasing growing time. However, these films are typically only used for a single growing season, and thus, their use and non-biodegradability come with some serious environmental consequences due to their persistence in the soil and potential for microplastic pollution, particularly when retrieval and disposal options are poor. On the microscale, particles < 5 mm from degraded films have been observed to disrupt soil structure, impede water and nutrient cycling, and affect soil organisms and plant health. On the macroscale, there are obvious and serious environmental consequences associated with the burning of plastic film and its leakage from poorly managed landfills. To maintain the crop productivity afforded by mulching with PE film while avoiding the environmental downsides, the development and use of biodegradable polymer technologies is being explored. Here, the efficacy of a newly developed, water-dispersible, sprayable, and biodegradable polyester–urethane–urea (PEUU)-based polymer was compared with two commercial PE mulches, non-degradable polyethylene (NPE) and OPE (ox-degradable polyethylene), in a greenhouse tomato growth trial. Water savings and the effects on plant growth and soil characteristics were studied. It was found that PEUU provided similar water savings to the commercial PE-based mulches, up to 30–35%, while showing no deleterious effects on plant growth. The results should be taken as preliminary indications that the sprayable, biodegradable PEUU shows promise as a replacement for PE mulch, with further studies under outside field conditions warranted to assess its cost effectiveness in improving crop yields and, importantly, its longer-term impacts on soil and terrestrial fauna.
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A two-year field trial comparing biodegradable mulching film to conventional low-density polyethylene (LDPE) for San Marzano tomato production found that both mulch types produced equivalent yield increases (25%) and improvements in fruit quality compared to bare soil. Biodegradable film began degrading in the field between 71 and 104 days after transplanting, making it a viable alternative that avoids end-of-life plastic waste. Replacing conventional plastic mulch with biodegradable alternatives could significantly reduce the agricultural microplastic burden entering soils globally.
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This field trial compared biodegradable and synthetic plastic mulches for tomato cultivation and found that all mulching treatments increased marketable yield by an average of 19.6%. Notably, fruits grown on biodegradable foil had the highest potassium, lycopene, and polyphenol content, suggesting biodegradable mulches can match synthetic plastic performance while reducing long-term plastic contamination of agricultural soil.
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