R. Mineva1*, V. Yankova2, N. Valchev1 1Department of Plant Production, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria 2Maritsa Vegetable Crops Research Institute, 32 Brezovsko shose Str., 4003 Plovdiv, Bulgaria (Manuscript received 20 June 2021; accepted for pu
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