The Plastic Paradox: A Systematic Review of Mulch-Derived Microplastic Pollution and the Sustainability of Arid Zone Agriculture

Purpose: This project will undertake a systematic review to comprehensively synthesize the global evidence on microplastic (MP) pollution originating specifically from plastic mulch film use in arid and semi-arid agriculture. Its primary purpose is to resolve the critical "plastic paradox," the conflict between the short-term agronomic benefits of mulching and its long-term environmental consequences. We will achieve this by rigorously evaluating the drivers of MP generation, quantifying transport pathways unique to drylands, and assessing the resultant impacts on soil health and crop productivity. Expected Outcomes: The review will yield a definitive, evidence-based synthesis presented in several key outputs. First, it will produce quantitative summaries of the relationship between mulching duration, management practices, and MP accumulation. Second, it will map the dominant environmental transport vectors (aeolian, hydrologic) that transform field-scale contamination into a regional pollution issue. Third, it will critically appraise the trade-off between yield enhancement and soil degradation. Finally, the project will generate a prioritized framework of knowledge gaps and actionable research and policy recommendations aimed at mitigating MP pollution while preserving agricultural water security, directly contributing to sustainable land management strategies in vulnerable regions.