To explore the effect of biologically active fertilizer to root grow, pieces of potato (Solanum tuberosum) were placed in a rhizobox filled with the dirt. Rhizobox was inclined under 45 degrees for positioning of the growing roots closer to the lower wall in response to gravity. On the left part of rhizobox were Control potato peaces and on the right side were potato piece soaked in biologically active fertilizer for 6 hours. Potato peaces were grown in rhizobox for 15 days.