Z. Ishaq, D.A. Machido, H.I. Atta* Department of Microbiology, Faculty of Life Sciences, Ahmadu Bello University, Zaria, Kaduna State, Nigeria (Manuscript received 16 April 2021; accepted for publication 31 January 2022) Abstract. The identification of effective indigenous strains of

G. Milev, P. Yankov Abstract. A field experiment was carried out in the trial field of Dobrudzha Agricultural Institute – General Toshevo for a period of three successive years with the aim to study the degree of compaction of soil on nodulation of common bean (Phaseolus vulgaris L.).