y A content of the main plant nutrients (N, P, K, Mg, Ca) in leachates from marginal light soil not fertilized and fertilized with sewage sludge from municipal boil. treatment plant from rural areas was detd. in 2008-2013. The concns. of macronutrients in the effluents from the soil were within the limits acceptable for class I and 11 of groundwater quality. The exception was the increase of nitrates concn. in leachates in the first year after planting Miscanthus x giganteus Greef et Deu. because of its low yield. The soil fertilization resulted in an improvement of its physicochem. properties by increasing plant nutrients and soil water capacity.