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Abstract: In the poultry industry, chemical suppressants are applied to chicken litter to decrease the level of ammonia. At the same time, mushroom (Agaricus bisporus) producers use poultry litter to increase the nitrogen level in the compost. To determine the influence of ammonia suppressants on composting and mushroom production, mushrooms were cultivated from compost prepared using litter treated during the poultry production process with PLT, Barn Fresh and Impact-P at 25.22 kg/100 m2, 40 kg/100 m2 and 0.49 kg/100 m2, respectively. During all stages of composting, no significant differences (P>0.05) were noted between the treatments for total nitrogen, ammonia, pH, EC, ash and moisture in the compost and headspace air. Moreover, mushroom yield, and amino acid contents of the substrates and the mushrooms were not significantly affected (P>0.05) by the ammonia suppressants in the poultry litter. Thus, the mushroom industry can confidently use poultry litter amended with PLT, Impact-P and Barn Fresh at the recommended rates.
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