INFLUENCE OF CHEMICAL FERTILIZATION ON SILO MAIZE PRODUCTION

Chemical fertilization is an agrotechnical measure essential in cropping systems and it guarantees yield boosts. At present, when setting up a cropping system, the main criterion to take into account is the influence of a certain technological part, in this case fertilization, of on the agricultural production; however the concept of sustainable development also requires the assessment of the impact on the primary consumer, along with complying with other requirements of environment protection and biodiversity conservation. In order to improve the influence of nitrogen and phosphorus chemical fertilizers inputs on biomass production in silo maize, when grown on the phaeoziom from Belciugatele Didactic Station, a monofactorial experiment was carried out, the fertilization having different doses of nitrogen and phosphorus. In the course of the experiment the Vultur hybrid especially designed for biomass production was used. Following the research carried out between 2002 and 2005, it was observed that the dry biomass production levels were between 6.27 and 8.13 t/ha; the increase of the chemical fertilizer doses applied led to yield boosts compared to the unfertilized treatments. Significant yield boosts were obtained in all three experimenting years when applying N100P50 and N150P100 formulas; between these two there were no significant differences. The increase of dosage over N150P100 results in lower yields