K. Vasileva1*, N. Bogatzevska2 1Maritsa Vegetable Crops Research Institute, 32 Brezovsko Shosse Str., 4003 Plovdiv, Bulgaria 2Institute of Soil Science, Agrotechnologies and Plant Protection “N. Pushkarov”, 7 Shosse Bankya Str., 1331 Sofia, Bulgaria (Manuscript received 16 March 2021;
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