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Impact of microplastic contamination on soil-plant nutrient dynamics in agricultural ecosystems
Summary
This pot experiment study in Indonesian peri-urban rice paddies tested four microplastic polymer types at four concentrations across two growing seasons, finding that concentrations above 1.0% w/w caused disproportionate reductions in shoot biomass (up to 42%), root length (up to 46%), and phosphorus uptake (up to 47.7%). PET caused the greatest reduction in plant growth, and the study establishes dose-response benchmarks for microplastic impacts on tropical rice nutrition.
Imagine a rice paddy where every kilogram of topsoil contains 200-1,800 microplastic particles this is already the reality in peri-urban Java. This research quantified the effects of four microplastic types (PE, PP, PET, PS) at four concentrations (0.1, 0.5, 1.0, 2.0% w/w) on soil nutrient availability, root morphology, and N-P-K uptake in rice grown in pot experiments at IPB University, Bogor, Indonesia, over two consecutive seasons (2021-2022). At 2.0% MP, shoot biomass declined 28-42% depending on polymer type, with PET causing the greatest reduction. P uptake was most sensitive, falling 47.7% at 2.0% PET. Root length decreased 31-46%, limiting nutrient foraging volume. MP effects were nonlinear: the 0.1% threshold produced <5% change, while concentrations above 1.0% caused disproportionate damage. These findings establish dose-response benchmarks for microplastic impacts on tropical rice nutrition.