Mikroplastik in Agrar: Gefahr für Boden & Wasser?

Microplastic pollution in agriculture represents an emerging environmental challenge with far-reaching consequences for soil health, water quality, and ecosystem integrity. The article examines how microplastics enter agricultural systems through various pathways including plastic mulch films, irrigation systems, pesticide formulations, and atmospheric deposition. Once present in agricultural soils, microplastics persist for extended periods due to their resistance to biodegradation, accumulating over time and potentially reaching problematic concentrations. The presence of microplastics in agricultural soils affects soil structure and function, potentially reducing water infiltration capacity, altering microbial communities, and impacting nutrient cycling processes essential for plant growth. These physical and biological changes can compromise soil health and long-term agricultural productivity. Microplastics also contaminate water resources through leaching into groundwater and surface runoff into rivers and lakes, creating pathways for microplastic dispersal throughout aquatic ecosystems. This water contamination poses risks to aquatic organisms and potentially affects drinking water quality, creating public health concerns. The article discusses potential consequences of microplastic accumulation in agricultural systems, including reduced soil fertility, altered water retention properties, and impacts on beneficial soil organisms. These effects can reduce agricultural productivity and increase the need for additional inputs to maintain crop yields. The article presents various solution approaches to address microplastic pollution in agriculture, ranging from prevention strategies to remediation techniques. Prevention approaches include reducing plastic use in agriculture by developing biodegradable alternatives to plastic mulch films and improving irrigation system design to minimize plastic degradation. Remediation strategies involve removing accumulated microplastics from contaminated soils, though such approaches remain technically challenging and economically expensive at large scales. The discussion emphasizes the need for comprehensive policy responses addressing microplastic sources in agriculture, supporting research into alternatives, and establishing standards for agricultural practices to minimize microplastic generation and dispersal.