Impact of Sandy Soil Amendment with Dairy Slurry Treated through pH Adjustment on Nutrient and Coliform Leaching

Livestock farming produces high volumes of animal slurry that can be sanitized using low-cost treatments by pH adjustment, reducing pathogen contamination, and promoting valorization as a safe fertilizer. This work aims to evaluate the impact sandy soil amendment with dairy treated adjustment on potential release nutrients coliforms into groundwater. A laboratory column leaching experiment was conducted surface application six tested: raw slurry, acidified H2SO4, alkalinized KOH, alkalinized/neutralized mineral fertilizer, control. The fertilizer rate 0.08 g N kg−1 dry soil. Leachates were analyzed for pH, electrical conductivity, N-NH4+ N-NO3−, macro- micronutrients, fecal coliforms. Results showed led significantly lower nitrate than (maximum 16.1 vs. 50.4%). use hygienized alkalinization decreased relative slurry. However, incomplete sanitization acidification strongly promoted coliform risk groundwater contamination. It concluded is safer solution regard pollution.