EVALUATION OF THE RELATIONSHIP BETWEEN FERTILIZERS AND NITROGEN FORMS IN AGRICULTURAL SOILS OF DURRES AND KRUJA CITIES

This paper material aims to present a statistical analysis to make an assessment of relationships between several indicators of agricultural lands as organic measures, the amount of chemical fertilizers and content of the two forms of nitrogen in soil nitrate and ammonium. Both organic matter and nitrogen forms of soil are analyzed in the lands of several greenhouses cities of Durres and Kruja during the 2005. The methodology given by QTTB Fushe-Kruje,which is still in use today, was used in the analysis of the soil .Ammonium and nitrate ions were determined with the Kejdal method and then subtitled with NaOH. Organic matter was measured by combustion. Most of these cases represent a medium content of organic matter within 4 to 8% levels, but there were also cases of low content of organic matter under 4% and cases of high content of it over the 8% level. Likewise in the analyzed soils we came across all levels of ammonium and nitrate ions concentration, but in all the cases the concentration of the nitrate ions was higher than those of ammonium ions. In most of the cases the analysed soils are evaluated as soils with high nitrogen concentration. Between the amount of fertilizers used and the content of nitrate ions was found a good correlation with R = 0.92, and between the amount of fertilizers used and ammonium contnent was found a moderate good correlation with R = 0.77