The aim of this experiment was to determine the dry matter content, pH and the volatilized ammonia from the poultry litter treated or not with different additives. Four hundred and forty birds were used, in randomized block design, with five treatments (1 - new litter; 2 - reused litter (RL); 3 - RL treated with aluminum sulfate; 4 - RL treated with gypsum and 5 - RL treated with hydrated lime) and four replicates. The samples of the litter were collected when the birds were 42 days old. There was no influence of the additives on the dry matter results. However, the gypsum reduced the pH value (6.97) and the quantity of volatilized ammonia (11.29 mg/kg) from the poultry litter. It was concluded that the gypsum can be added to the poultry litter, promoting a reduction in the pH value and in the losses of nitrogen by ammonia volatilization.
additives; ammonia; moisture; poultry litter
