摘要：In this paper are presented the results of performed researches for to determine the accumulation potential of nitrates in lettuce and spinach, grown within protected environments, depending on the applied fertilization level. In the culture technology of lettuce and spinach, they were applied the following fertilization variants (fertilizer being ammonium nitrate with 33% nitrogen): V1 = 0 kg nitrogen/ha; V2 = 25 kg nitrogen/ha; V3 = 50 kg nitrogen/ha; V4 = 75 kg nitrogen/ha; V5 = 100 kg nitrogen/ha. For each fertilization variant, they were realised 4 repetitions. For determination of accumulation potential of nitrates in lettuce and spinach cultivated within protected environments, it was used an enzymatic method. Lettuce, Gra ia variety, has a high accumulation potential of nitrates, in the range 1931.46 mg NO3-/kg . 3159.03 mg NO3-/kg, and spinach, Romanesc variety, also has a high accumulation potential of nitrates, in the range: 1636.76mg NO3-/kg . 2575.86 mg NO3-/kg
