The Role of Rotation and Nitrogen Fertilization Level upon the Economic Indicators at Wheat and Corn Crops in Condition of a Long Term Experience

Since 1843 when Sir John Lawes and Sir Henry Gilbert started several long-term field experiments at Rothamsted Research, up to now a lot of long term experiences have been developed in the world. In this research we analysed the economic impact of crop rotation and nitrogen fertilization level upon the wheat crop. The research was performed in a long term experiment established in 1981, in a bifactorial experiment, at Moara Domneasca Experimental farm where Factor A is crop rotation duration with 6 gradual levels, and Factor B nitrogen fertilization level with 4 gradual levels.This paper centralised the data collected in the last ten years (2003-2013). The results show: the increase in crop rotation durations determines an increase in the quantity and quality of production; the increase of nitrogen fertilization level leads to an increase in production; there is a significant linear correlation between crop rotation length, nitrogen and production; regarding the economic impact, the unitary production cost decreased along with increasing the crop rotation length and the nitrogen fertilization level.