T. Vancheva1, S. Masheva2*, D. Ganeva2, N. Bogatzevska3 1Biological Faculty, Sofia University, 8 Dragan Tsankov, 1164 Sofia, Bulgaria 2Vegetable Crops Research Institute Maritsa, 32 Brezovsko shose, 4000 Plovdiv, Bulgaria 3Institute of Soil Science, Agrotechnologies and Plant Protecti
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