SCIENTIFIC PAPERS

Scientific Papers, USAMV Bucharest, Series A, Vol. LII, 2009, ISSN 1222-5339RESEARCH REGARDING THE INFLUENCE OF SEWAGE SLUDGEIN ORGANIC AGRICULTUREG. MUJEA*, N. IONESCU**, MARILENA DIACONU*, ANA IORDANESCU**Wastewater Treatment Plant Pitesti Company**Agricultural Research and Development Station of PitestiKeywords: organic agriculture, organic carbon, biomass, heavy metals, luvosoilAbstractIn case of plants cultivation in organic agriculture, the completion of organic-mineralsupport is decisive in providing the feed, both in quantitative and qualitative terms.Research performed both to us and in other parts have demonstrated that an extremelyvaluable support material for agriculture is represented by the sewage sludge. In case ofluvosoil there were used progressive doses of sludge, respectively: 0, 5, 10, 25 and 50 t.h -1 ,with the aim of observing the trends in terms of improving the organic matter reserves.Generally the organic carbon (OC) content increased from approximately 1.5% to over2%. Due to this fact there was also noticed an increase of total vegetal biomass and anincrease in terms of grains, mainly for cultivated field crops, respectively maize, wheat andsoybeans. In the same time, the heavy metals content has situated at the lowest levels, notdangerous, some representing in fact microelements: Zn, Cu, Mn.184