MODELING OF THE NITRIFICATION PROCESS IN A SOIL IN CĂLĂRAŞI COUNTY

Quantifying the best possible the nitrification of nitrogen in the soil remains an important issue for the sustainable agriculture and for the environmental protection. The aim of the study was to evaluate in the laboratory the influence of some factors: temperature, humidity and amount of manure incorporated in the process of nitrification in a soil mainly in Călăraşi county, on a cambic chernozem. The results of the laboratory analyses were statistically processed by the analysis of variation. In the experimental model, the nitrogen dose increase, given to the soil, had no effect on the nitrification capacity. However, the humidity of 100 % nitrification was stimulated even in the case of the sample test, which has not received the ammonium nitrate. Such an observation could be the basis of the observation that in the irrigated fields, the processes of mineralization of organic substance are always high, especially at high doses of mineral fertilizer. It was noticed that the nitrification process was subject to a seasonal dynamics. The nitrification is more intense in autumn, when the conditions are optimal for this process. As a conclusion, the fertilization system has a great influence on the nitrogen nitrification in the soil.