Monitoring digestate application on agricultural crops using Sentinel-2 Satellite imagery
This study addresses environmental risks associated with agricultural application of digestate—including soil health degradation, microplastic contamination, and nitrogen leaching—by proposing a dynamic monitoring framework integrating Sentinel-2 time-series remote sensing and machine learning. We systematically construct the first crop-specific spectral response dataset (encompassing EOMI, NDVI, and EVI) following digestate application across four major crops: wheat, maize, sunflower, and sugar beet. A hybrid remote sensing–machine learning detection architecture is developed, incorporating Random Forest, k-Nearest Neighbors, Gradient Boosting, and Feedforward Neural Networks. Applied at scale in Thessaly, Greece, the method enables large-area, low-cost, and near-real-time identification of digestate presence, achieving a maximum F1-score of 0.85. This approach overcomes the spatial limitations and high operational costs of conventional field-based monitoring, establishing a novel paradigm for precision organic fertilizer management and intelligent environmental risk control.