Agricultural soils are deficient of phosphorus(P) worldwide. Phosphatic fertilizers are therefore applied to agricultural soils to improve the fertility and to increase the crop yield. However, the effect of phosphorus application on soil N_2O emissions has rarely been studied. Therefore, we conducted a laboratory study to investigate the effects P addition on soil N_2O emissions from P deficient alluvial soil under two levels of nitrogen(N) fertilizer and soil moisture. Treatments were arranged as follows: P(0 and 20 mg P kg~(–1)) was applied to soil under two moisture levels of 60 and 90% water filled pore space(WFPS). Each P and moisture treatment was further treated with two levels of N fertilizer(0 and 200 mg N kg~(–1) as urea). Soil variables including mineral nitrogen(NH_4~+-N and NO_3~–-N), available P, dissolved organic carbon(DOC), and soil N_2O emissions were measured throughout the study period of 50 days. Results showed that addition of P increased N_2O emissions either under 60% WFPS or 90% WFPS conditions. Higher N_2O emissions were observed under 90% WFPS when compared to 60% WFPS. Application of N fertilizer also enhanced N_2O emissions and the highest emissions were 141 μg N_2O kg~(–1) h~(–1) in P+N treatment under 90% WFPS. The results of the present study suggest that P application markedly increases soil N_2O emissions under both low and high soil moisture levels, and either with or without N fertilizer application. Agricultural soils are deficient of phosphorus (P) worldwide. Phosphhatic fertilizers are therefore applied to agricultural soils to improve the fertility and to increase the crop yield. However, the effect of phosphorus application has been studied. a laboratory study to investigate the effects P addition on soil N2O emissions from P deficient alluvial soil under two levels of nitrogen (N) fertilizer and soil moisture. Treatments were arranged as follows: P (0 and 20 mg P kg ~ (-1) ) was applied to soil under two moisture levels of 60 and 90% water filled pore space (WFPS). Each P and moisture treatment was further treated with two levels of N fertilizer (0 and 200 mg N kg -1 (as) urea Results showed that the addition of mineral nitrogen (NH 4 + -N and NO 3 - - N), available P, dissolved organic carbon (DOC), and soil N 2 O emissions were the period of the study period of 50 days. P increased N_2O emissions eit Higher N 2 O emissions were observed under 90% WFPS when compared to 60% WFPS. Application of N fertilizer also enhanced N 2 O emissions and the highest emissions were 141 μg N_2O kg -1 (h) Under 60% WFPS or 90% WFPS conditions. ~ (-1) in P + N treatment under 90% WFPS. The results of the present study suggest that P application markedly increases soil N2O emissions under both low and high soil moisture levels, and either with or without N fertilizer application.