L. Nenova*, M. Benkova, Ts. Simeonova, I. Atanassova Institute of Soil Science, Agrotechnologies and Plant Protection “N. Poushkarov”, Agricultural Academy, 1331 Sofia, Bulgaria (Manuscript received 20 January 2023; accepted for publication 14 December 2023) Abstract. The effectivenes

G. Panayotova1*, M. Almaliev2, S. Kostadinova2 1Department of Plant Production, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria 2Department of Agrochemistry and Soil, Faculty of Agronomy, Agricultural University, 4000 Plovdiv, Bulgaria (Manuscript received 29 Se

L. Dospatliev Abstract. The study was conducted on alluvial-meadow, maroon-forest soils and vertisols with Virginia tobacco. The total content of zinc is measured through decomposition by HF, HClO , and HNO acids. A solution of 0.005 M diethylentriaminepentaacetic acid + 0.1 M trietha

Research studies on cotton potassium fertilization in the last years at the Cotton and Durum Wheat Research Institute – Chirpan, Bulgaria have been reviewed. The soil Eutric vertisols was well supplied with available potassium (31-43 mg/100 g soil). The effect of K application was not