N. Markova Ruzdik1*, D.Valcheva2, D.Vulchev2, Lj. Mihajlov1, I. Karov1, V. Ilieva1 1Faculty of Agriculture, “Goce Delchev” University, 2000 Shtip, Republic of Macedonia 2Institute of Agriculture, 8400 Karnobat, Bulgaria Abstract. The aim of this paper was to determine the correl