K. Vasileva1*, N. Bogatzevska2 1Maritsa Vegetable Crops Research Institute, Agricultural Academy, 32 Brezovsko Shosse Str., 4003 Plovdiv, Bulgaria 2Institute of Soil Science, Agrotechnologies and Plant Protection “N. Pushkarov”, Agricultural Academy, 7 Shosse Bankya Str., 1331 Sofia,
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