Nanoplastics in agriculture: lessons from two decades of engineered nanomaterials research
Nanoplastics are emerging agricultural contaminants. Two decades of engineered nanomaterials research offer methods and mechanistic insight, but nanoplastics’ polymer diversity, weathering, and additive loads require hybrid characterization and focused study of plant, soil, and microbial impacts.
Nanoplastics (NPs) are emerging contaminants in agriculture. Two decades of research on engineered nanomaterials (ENMs) provide methods, models, and mechanistic frameworks that can inform NP studies, but important differences require adapted approaches.
Characterization of NPs demands hybrid methods. ENM-based analytical tools remain useful, yet NP analysis must incorporate polymer-focused techniques to capture heterogeneity introduced by environmental weathering, additives, and surface aging.
Interactions between plants and NPs can occur through roots, seeds, and leaves. Unlike many ENMs that act by releasing reactive ions, NPs influence plants via physical properties such as size, hydrophobicity, and surface functional groups. These features raise concerns about membrane disruption and potential transgenerational transport in crops.
Soil serves as a dynamic sink for NPs. In contrast to dissolving ENMs, NPs undergo physical aging and heteroaggregation in soils. Soils can also act as vectors that either enhance or inhibit the mobility of agrochemicals when NPs are present, potentially altering agrochemical fate and exposure.
Microbial communities respond to NPs in ways shaped more by NP-specific properties than by straightforward toxicity. Changes in nutrient cycling and the dynamics of resistance genes have been identified as key microbial-level effects tied to NP features.
Comparative study of ENMs and NPs can accelerate mechanistic understanding and support development of predictive models for NP behavior in agricultural systems. Clarifying how NPs interact with soil, crops, and microbes is essential for assessing risks to soil health, crop productivity, and food security.