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Microplastics cause environmental problems. Biodegradable plastics have become popular because they aim to avoid such problems. However, their decomposition in the soil may have an impact. This study aims to investigate the effects of biodegradable plastics on the physicochemical properties of soil, specifically the production of CO 2  and N 2 O in the soil and plant growth. Three kinds of biodegradable plastics in the forms of 1) nonwoven fabric sheets made of poly-lactic acid (PLA) and polybutylene-succinate (referred to hereafter as  fabric ), 2) laminate sheets made of polybutylene adipate terephthalate (PBAT) and pulp (hereafter  laminate ), and 3) drinking cups made of PLA (hereafter  cup ), were cut into small pieces (&lt;5 mm), added to soil, then water-holding capacity was determined and incubated aerobically for 4 weeks at 30°C in the dark. Soil and gas samples were collected weekly to measure soil pH, nitrate-nitrogen content, CO 2 , and N 2 O productions. These plastics were also tested in a pot experiment with Komatsuna ( Brassica napa  var.  perviridis ). We tested for seed germination, plant growth, leaf color, and fresh weight at harvest. Results showed that the water retention capacity was higher in the fabric plastics as compared to the  cup  plastics and the control. Soil pH with the  fabric  plastics dropped during the initial 2 weeks of incubation, then recovered to a similar pH to the control (without plastic). Nitrate contents in the soil with  laminate  plastics were lower than those in the control, while CO 2  production in the soil with the  laminate  plastics was higher than that in the control and the other plastics during the incubation period, and even higher than the one of added plastic-C. N 2 O was produced rapidly within 1 week of incubation in the soil with the  laminate  plastics, and cumulative N 2 O production from incubation was more than that of the control. The seed germination and plant growth tended to be suppressed in the pot experiment with the  fabric  and  laminate  plastics. The results indicate that the influence of these biodegradable plastics on soil properties, greenhouse gas production, and plant growth on the kind of plastic and the timing.

Effects of biodegradable plastics on soil properties and greenhouse gas production