Impact of Different Soil Tillage Practices on Microplastic Particle Abundance and Distribution

Microplastic contamination in agricultural soils has become a growing concern due to its potential impact on soil quality and ecosystem health. This study investigates the abundance, shape, and vertical distribution of microplastics in agricultural soils under different tillage practices. A split-split-plot experimental design was used at two sites, comparing conventional tillage (ST), conservation tillage (deep and shallow), and fertilization treatments. Results indicate that microplastics were present in all soil samples, with significantly lower concentrations in conservation shallow tillage (CTS) compared to deep conservation tillage (CTD). Vertical distribution was found to be homogeneous in ST and CTS but heterogeneous in CTD, suggesting an influence of soil disturbance levels on microplastic migration. Fertilization significantly affected microplastic accumulation at one site, supporting the hypothesis that inorganic fertilizers contribute to microplastic input as well. These findings highlight the need for soil management practices that mitigate microplastic accumulation and mobility.