N. Ivanov1*, T. Angelova1, S. Laleva1, S. Ribarski2, D. Miteva1, D. Yordanova1, V. Karabashev1, I. Penchev2 1Agricultural Institute, 6000 Stara Zagora, Bulgaria 2Department of Morphology, Physiology and Nutrition, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria
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