V. Koteva1*, S. Kostadinova2 1Institute of Agriculture, 1 Indusrtialna, 8400 Karnobat, Bulgaria 2Department of Agrochemistry and Soil Science, Faculty of Agronomy, Agricultural University, 12 Mendeleev, 4000 Plovdiv, Bulgaria Abstract. This investigation was aimed at determining the c

S. Todorova, N. Simeonova, K. Trendafilov, V. Valcheva Abstract. In our research we are studying changes of some common chemical properties (pH, salt concentration, total carbonates, and humus content) during long-term organic-mineral fertilization and after its cessation. The object

V. Tsolova, M. Banov Abstract. The paper deals with the characterization of organic matter in reclaimed Technosols (WRS, 2007) built in the different mine regions of Bulgaria (Chukurovo, Pernik, Maritsa-Iztok and Lokorsko). The studied soils were formed around 30 years ago through the