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Alternative Mulches for Sustainable Greenhouse Tomato Production
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Researchers evaluated three mulch types — polyethylene, straw, and biodegradable biopolymers — compared to non-mulched controls in a Mediterranean greenhouse over two years of organic tomato production, measuring soil moisture, temperature, physicochemical properties, crop yield, and weed control. They found that biodegradable biopolymer mulches offered comparable agronomic performance to polyethylene while avoiding plastic residue accumulation in soil.
Soil mulching has advantages for horticultural crops, from both agronomic and phytosanitary points of view. The most common material used is polyethylene (PE); however, promising alternatives from the circular economy exist, such as straw (ST) and biodegradable biopolymers (BBs). The effect of the three aforementioned mulches was evaluated and compared to non-mulched soil in a Mediterranean greenhouse for two years of an organic tomato crop. Physical (moisture and temperature) and physicochemical properties of the soil, in addition to crop yield and the effect of the mulches on weed control, were assessed. Additionally, the deterioration of plastic mulches was assessed. The temperature was higher in the mulched soils, but few differences were found between soil and BB at the end of the second cycle. Evaporation was lower in mulched soil, in general, without big differences among the types of mulch. Crop yield did not show differences. At the end of the trials, of the 16 physicochemical variables evaluated, only a slight increase in pH was detected in the ST-mulched plots. BB film degradation reached 5.6% and 6.7% of the total surface at the end of the first and second cycles, respectively. Weeds were equally limited for PE, BB, and ST mulches, but cereal seeds contained within the straw germinated randomly all over the crop cycle. In summary, straw and biodegradable plastic mulches offered the same benefits as conventional PE mulch. Therefore, they can be considered a feasible and more sustainable option, in addition to being consistent with the principles of the bioeconomy.
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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.
Effect of Biodegradable Mulch and Different Synthetic Mulches on Growth and Yield of Field-Grown Small-Fruited Tomato (Lycopersicon esculentum Mill.)
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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.
Biodegradable Mulch for Vegetable Production. A Review
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This review examined biodegradable plastic mulches as alternatives to conventional polyethylene mulch films in vegetable production, summarizing yield benefits and degradation performance. Replacing conventional plastic mulch with truly biodegradable alternatives could reduce the large amounts of agricultural microplastics shed by mulch film fragmentation.
Soil-biodegradable Plastic Mulches for Sustainable and Organic Agriculture: An Updated Assessment
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Researchers reviewed a decade of field and laboratory studies on soil-biodegradable plastic mulch films, finding they deliver agronomic performance comparable to polyethylene mulch across specialty crops while eliminating end-of-season removal, though multiyear data confirm that micro- and nanoplastics can form during degradation and that no commercially available product yet qualifies for US certified organic production.
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.
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