Research Journal of Agricultural Science, 48 (4), 2016 179 RESULTS REGARDING THE EFFECT OF PHOSPHORUS AND NITROGEN ON RAPE YIELD Alina Laura AGAPIE 1 , Gabriela GORINOIU 1 , Simona NITA 2 1 Agricultural Research and Development Station Lovrin, 200, Lovrin, 307 250, Romania 2 Banat s University of Agricultural Sciences and Veterinary Medicine Timisoara alinamartinig@yahoo.com Abstract. The role of long-term experience with different fertilizers is to highlight the relationships established between them, yield formation and changes that occur in the soil. Two types of factors contribute to these objectives: pedoclimatic factors and technological ones.Among the technological factors, fertilization is a key element in shaping the quality and quantity of the crop and soil.This paper aims to analyze the influence of different doses of nitrogen- and phosphorus-based fertilizers on rape yield, between 2014 – 2016.The studies were performed in stationary experiences placed in a four years rotation: soybean – wheat – rape–corn. Keywords: fertilization, rape, Nitrogen (N), Phosphorus (P) INTRODUCTION The importance of winter rape has increased considerably in recent years due to the fact that it provides the raw material for the production of oil, which is an unconventional alternative to the sources of fossil energy and in achieving higher quality oils, used in human nutrition and not only (BUZDUGAN, 2010). High demand for winter rape,the high yields and income achieved per hectare, the high profitability of culture have made the area occupied by this culture to be in continual growth in increasingly diverse areas (SAICU, 2013). Scientific studies have shown that rape reacts very well both to organic and mineral fertilization, as well as a combination of the two (PAL AND GANGAWAR, 2004; RÎŞNOVEANU AND BUZDUGAN , 2011, SAICU, 2013). Mineral fertilization is considered by most experts to be the main technological key in the culture of rape (SAICU, 2013). Studies have also shown that it is in first place among the factors on whichthe production and qualitydepend, and implicitly,it affects the economic efficiency of the rape crop (LÄNISTE, 2004, SAICU, 2013). MATERIAL AND METHODS The experiment was located on the land of ARDS Lovrin on a semicarbonatic, weakly-glezated chernozem, between 2014 and 2016. The previous plant was winter wheat. The plots hada dimension of 36 , seeded at a distance of 25 cm between rows and a density of 50 plants/ . Phosphorus-based fertilizers (superphosphate 46%) and those with potassium (potassium salt 60%) were administered during the base plowing. The nitrogen (ammonium nitrate 33.5%) was applied fractionated: one-third of the dose during sowing and the other two thirds in the spring, after the resumption of the vegetation period. Data was statistically analyzed using the variance analysis procedure for two factors using a split plot design, with four replications. Means were compared using the least significant difference test (CIULCA, 2006). The significance ofdifferenceswas expressedbased on symbols and letters, beingconsidered as significantasthe differences betweenvariantsmarked withdifferent letters.