20 (Special Issue 1) 2019

BULGARIAN HUMIC SUBSTANCES SOCIETY AND AN OVERVIEW ON HUMIC SUBSTANCES RESEARCH IN BULGARIA

Ekaterina Filcheva … 5

HUMIC SUBSTANCES, PHYSICOCHEMICAL PROPERTIES AND AGROCHEMICAL CHARACTERISTIC OF STRONGLY LEACHED CHERNOZEM FROM NORTHEASTERN BULGARIA

Toma Shishkov, Ekaterina Filcheva, Margarita Nankova, Milena Kercheva, Emil Dimitrov … 29

SOIL QUALITY ASSESSMENT DOWN THE PROFILE OF HAPLIC CHERNOZEMS AS A RESULT FROM 50 YEARS MINERAL FERTILIZATION

Margarita Nankova … 45

LONG-TERM LOW-INPUT NUTRITION REGIME OF HAPLIC CHERNOZEMS AND ITS INFLUENCE ON THE PRODUCTIVITY OF T. AESTIVUM L. CULTIVARS

Margarita Nankova, Valentin Savov, Konstantin Chakalov, Ekaterina Filcheva … 55

INFLUENCE OF SOIL TYPE AND LAND USE ON SOIL ORGANIC MATTER IN CLIMATE CONDITIONS OF WEST CARPATHIAN MTS. AND PANNONIAN BASIN

Gabriela Barančíková , Erika Tobiašová , Erika Gömöryová, Jarka Makovníková, Ján Halas, Štefan Koco, Rastislav Skalský … 63

ORGANIC MATTER CONTENT AND QUALITY OF BULGARIAN SOILS

Ekaterina Filcheva … 71

TRACE ELEMENTS AND ORGANIC MATTER COMPOSITION IN STRONGLY LEACHED CINNAMONIC FOREST SOIL FROM PERNIK REGION IN WESTERN BULGARIA

Toma Shishkov, Ekaterina Filcheva … 79

MARITSA IZTOK LIGNITE HUMUS MATTER STUDY THROUGH AP-TPR-GC/MS

Maya Stefanova, Stefan Marinov, Jan Czech, Robert Carleer, Jan Yperman … 89

CAN HUMIC PRODUCTS SUBSTANTIALLY IMPROVE ECOSYSTEM QUALITY AND ECONOMIC YIELD?

Daniel C. Olk, Dana L. Dinnes, J. Rene Scoresby, Chad R. Callaway, Jerald W. Darlington … 95

INFLUENCE OF BIO-HUMATES ON SOME PHYSIOLOGICAL ANSWER OF POINSETTIA

Konstantin Chakalov, Todorka Popova, Valentin Savov, Gergana Angelova-Deleva, Cvetelina Metodieva … 111

CHARACTERIZATION OF SOIL ORGANIC MATTER AND PAHs CONCENTRATION IN SPILS AT LIVINGSTON ISLAND, ANTARCTICA

Denitsa Apostolova, Ekaterina Filcheva, Achim Bechtel, Kalinka Markova, Irena Kostova … 117

Silva Balcanica