Laboratory experiments of poultry manure incubated for three days at $35^{circ}$ were conducted to learn some informations on the relief of nitrogen loss during processing. Results obtained are as follows: 1) Blending phosphoric acid, triplesuperphosphate or superphosphate to poultry manure could reduce the volatilization of ammonia and saved nitrogen in the manure by 80 to 90 percent, though nonblending saved the nitrogen only by 40 to 60 percent during three days incubation. 2) The additives must be blended thoroughly to the manure to obtain the least loss of nitrogen during the incubation. 3) The severe loss of nitrogen was occurred from the drying process of fermented manure of both treatment, that is $60{sim}80$ percent loss at the blended treatment with phosphoric acid, triplesuperphosphate or superphosphate, and $70{sim}90$ percent loss at non-blended. 4) Drying the fermented manure under the fixed temperature of about $65^{circ}$ for three days saved more nitrogen than dried manure under the temperature gradually raised from the room temperature to about $45{sim}65^{circ}$ for three days.