We used an automated flux monitoring system to measure N2O, NO, and NO2 fluxes from an Andisol field between May 1999 and September 2000. Pac choi and spinach were cultivated for 1.5 months in 1999 and 2000, respectively. We applied 15 g N m-2 of oilcake, cattle manure, fishmeal, dried cattle excreta, or urea to each plot. N2O and NO emissions from organic plots over the cultivation period were 2.55 mg N m-2 to 35.2 mg N m-2, and 2.48 mg N m-2 to 22.5 mg N m-2, respectively. Those from the urea plot were 10.9 mg N m-2 to 21.1 mg N m-2, and 52.0 mg N m-2 to 105 mg N m-2, respectively. We estimated that N2O emission from organic fertilizer is equivalent to that from chemical fertilizer application on Japanese Andisol field.