One of the causes determining low productions in grasslands are the soil depletion in nutritive elements, which are extracted through each crop without be replaced. A poor supply determines a slow growth of plants and reduces in the same time the concentration of these elements in the harvested biomass (AERTS And CHAPIN, 2000). The main goal of this paper is to compare the green mass productions obtained in the grassland of Vârciorova, as result of fertilization with mineral fertilizers, using the Duncan test. In order to do this, we settled an experiment with 10 experimental variants of fertilization with nitrogen, phosphorous and potassium in different doses (V1-V10). To elaborate this paper we considered the mean production obtained within the experimental cycle 2006-2008. Results showed the existence of production differences statistically assured between V1 – the unfertilized variant and all other variants fertilized with chemical fertilizers, and concerning the gradually application of nitrogen it was found that it determines production increases, fact highlighted by the production differences between V7, V9 and V10, which are statistically assured.

natural grassland, chemical fertilization, production, Duncan test.

Presentation: oral