can be immobilized or transformed to organic forms. Knowledge of evolution of N forms during composting is particularly important to assess agronomic and economic value of compost product, maturity of compost and risk following land application.
The concentrations of P in animal manure and compost ranged from 1.5 to 39.3 g kg-1 (Sharpley and Moyer 2000).
Most of the studies about P during composting only include total P (TP) content or the increment between final and initial TP concentrations.