Ammonium (NH4 +) and nitrate (NO3 –) are the two main forms of nitrogênium that can be absorbed by most plants depending on environmental conditions. An experiment has been conducted in a meadow with the aim of assessing the effect of different NO3-/NH + 4 relationships on the development and content of N, P and K in berinjela. The experimental design used was entirely casualised with five treatments and four repetitions. The treatments consisted of five nitrate/ammonium ratios (100/0, 75/25, 50/50, 25/75 and 0/100). The plants were grown in pots with a capacity of 12.0 dm³. The growth parameters have been assessed: plant height, number of leaves, foliar area, dry mass of the aerial part, specific foliar area, foliar area ratio, nitrogênium, phosphorus and potassium content in foliar tissue. Plant development and nutrient content have been affected by nitrate/ammonium relationships. It was found that the lowest development was obtained for plants grown with only nitrate or ammonia as a source of nitrogênium. The results showed that berinjela culture grows better when NO3 – and NH4 + mixture occurs, mainly in the nitrate/ammonium ratio 75/25. Key words: Solanum melongena L., mineral nutrition, nitrogenated fertilisation.