The aim of this research was find biochar effect, as amandment on soil properties and as mulch, on crop yield of bell pepper and garlic. Biochar was made by slow pyrolysis. Half of this biochar were activated with cattle slurry, half were non-activated. We tested it as field experiment with six treatments in three repetations. Experiment was designed in two parts. In first part, we planted bell pepper 'Bagoly' F1 and garlic 'Gardacho' in second. In first part we mulched plants with activated biochar (two treatments) non-activated biochar (two treatments), polyethilene mulch and no mulch. In second part we incorporated 16 t/ha of biochar from one biochar (activated/non-activated) treatment, when the other stayed as mulch. Than we planted garlic. Meanwhile growing season we took samples for analyzing soil properties and harvest crop. Results of analyses confirm that activated biochar had influence on increase of soil nitrate, phosphorus and potassium. Biochar also had influence on soil density and retention of water. Non-activated bio char increased soil pH (0,2). Average yield of pepper was 41 t/ha on activated biochar mulch and 24,2 t/ha on non-activated biochar mulch. Incorporation of activated biochar influenced on decrease of garlic yield (15,2 t/ha) compared with not input biochar (16,8 t/ha). Input of non-activated biochar in soil not effected on crop yield of garlic (13,6 and 12,8 t/ha).