D. Dermendzhieva1*, G. Kostadinova1, G. Petkov1, D. Dimov1, T. Dinev2, T. Penev1, Tch. Miteva1, J. Mitev1 1Department of Applied Ecology and Animal Hygiene, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria 2Department of Biochemistry, Microbiology and Physics, Fa

L. Hadjinikolova, D. Terziyski, A. Ivanova Abstract. . This study is related to the development of mineral fertilization schemes aimed at balancing the content and the N:P ratio in the water of carp ponds and its impact on main physicochemical and hydrobiological environmental factors