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Plastic budgets to assess the sustainability of agricultural productivity in a large-scale irrigation district
Summary
Researchers tracked where the plastic from farm mulch (thin plastic sheeting used to boost crop growth) actually ends up in a major farming region in China, finding that for every kilogram of grain grown, tiny plastic fragments called microplastics are released—but over 92% stay trapped in the soil, while only a small fraction leaks into groundwater or surface water. This matters because groundwater and surface water are common drinking water sources, so the fact that most microplastics stay put in soil (rather than washing into our water supply) is reassuring news, though the plastic buildup in farm soil over time still deserves attention.
Plastics have become deeply intertwined with modern agricultural activities. However, a comprehensive plastic budget for farmland systems has not yet been established. In this study, we developed a farmland plastic balance model for a large, long-term plastic-mulched agricultural system in the Hetao Irrigation District, China, by integrating three consecutive years (2022–2024) of microplastic measurements in groundwater, surface water, and soil, monitoring shifts in hydrological conditions, and synthesizing historical agricultural data, to quantify plastic fluxes and assess plastic impacts on agricultural productivity sustainability. The results show that in 2024, 0.59 g of microplastics were generated per kilogram of grain produced; soil retained 92.35% of the microplastics generated during that year, 0.32% entered groundwater, and 7.33% was transported to surface water. The assessment indicates that the impact of plastic use on agricultural productivity is relatively limited. This study advances a systematic, multicompartment plastic mass balance framework to characterise the fate of plastics in farmland systems and provides new insights and management implications for plastic use and control in farmlands.