THE QUANTIFICATION OF THE SOIL EROSION IN THE HILLY ZONES FROM MOLDAVIA AND OLTENIA PUBLISHEDAna Maria DODOCIOIU, R. MOCANU, M. SUSINSKI
Taking account tha,t lately, the erosional process on the slope soils has intensified both by non rational exploitation of the woods and arable land and by the unproper technological system, especially on small farms, there is need to know the size of this phenomenon and to find the vulnerable zones and recovery measures. Worldwide researches on this domain are multiple, especially in Northern European countries that have large slope surfaces, e.g. Scotland, UK, Norway, Finland, Sweden, Germany who have evidentiated this phenomenon for agricultural ecosystems. In our country there have been made researches in the last years at the Research Centre for Erosion Control Perieni, District Vaslui. Having as a base the 52-149/2008 Research Project: „Researches on the soil and nutrient losses within the hilly zones of Moldavia and Oltenia” we have initiated researches in these two zones in order to quantify the soil erosion. The researching method has used standard plots for controlling runoffs on verstants from Valea Tarinei (Moldavia) and Preajba (Oltenia). The plots have been cropped as follows: soybean, beans, bromus, wheat, corn, furrow, natural and sown pasture, being fertilized by different mineral fertilizers. On the basis of collected runoffs after each rain there were made determinations of eroded soil. These researches are a novelty in this domain because it is the first time when there are determined the quantities of eroded soil on slope under different crops evidentiating the harmfulness of the erosion phenomenon. The researches have been limited by the slope of the land and by the rainfall in the two studied zones, Valea Tarinei (Vaslui) and Preajba (Gorj). These researches have a large aplicability in practice due to evidentiating for winter cereals, wide row crops and pastures the soil quantities that can be lost and warn the farmers about the most apropriate tillage on slope land. The paper is original by its researching method as well as by elaborating diagrams for each rain and for each crop emphasizing the following issues: the span of the rain (mm), liquid runoff (me/ha), the runoff coefficient and the rosion tones/ha. The paper has a special importance because it warn attention on preserving the soil according with the European Directive of Preserving Soil Quality.
erosion, standard plots, fertilizer doses, rain diagram, liquid runoff, eroded soil