Yes, agricultural plastic mulch can be used to improve soil fertility. It helps in retaining soil moisture, which is crucial for plant growth, especially in arid regions. By reducing evaporation, mulch can maintain a more consistent soil moisture level, promoting better root development. Additionally, it can increase soil temperature, which can lead to faster plant growth and earlier harvests in cooler climates. Mulching also suppresses weed growth, reducing competition for nutrients and water. Furthermore, it can improve soil structure by preventing crusting and promoting better aeration, which is beneficial for soil microorganisms and nutrient cycling. However, it's important to manage plastic mulch responsibly to avoid environmental pollution from non-biodegradable materials.