Seagrass litter that piles up on beaches can be turned into a mature, plant-friendly soil amendment by mixing it with fish market waste and processing it through composting, worms, and anaerobic digestion. Adding zeolite-rich volcanic tuff strips out ammonium that would otherwise stunt plant growth, making the product suitable for restoring degraded ground.
1
Posidonia oceanica litter and fish market waste were combined at a 3:1 ratio to balance carbon, nitrogen and phosphorus, then processed through 6 months of composting plus 1 month of vermicomposting.
2
pH, electrical conductivity, water content and C/N ratio changed significantly over the 7 months, and all chemical elements showed marked variation, indicating maturation of the amendment.
3
Zeolite-rich tuff selectively removed ammonium from the soluble fraction and markedly reduced phytoinhibition, though it diluted organic matter and most macronutrients while raising some geogenic elements.
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