A. Zidan1, M. Ibraheem2* 1Department of Soil and Water Science, Faculty of Agriculture, Tishreen University, Lattakia, Syria 2General Commission for Scientific Agricultural Research (GCSAR), Tatous, Syria (Manuscript received 20 June 2022; accepted for publication 7 March 2023) Abstra

V. Koteva Abstract. The investigation was carried out in a field certified for organic agriculture, on soil type Pellic vertisol (FAO) during 2004 – 2012. The changes in soil acidity, total humus content and reserves of mineral nitrogen, mobile phosphorus and available potassium in so