The paper presents results from the investigations on the corrosion behavior of mild steel (0.17 %C) in water solutions of liquidmineral fertilizer, MAXGROW at different concentrations (0.2, 0.4, 0.6, 1.0 % vol. and concentrate) and temperatures (20, 40, 60oC). The corrosion rate and corrosion penetration of the steel have been measured by means of gravimetric and electrochemical methods. The conclusion about corrosion resistance of the steel under different conditions has been made - it possesses high resistance in solutions of liquid mineral fertilizer MAXGROW.The steel could be recommended as good and comparatively cheap construction material for manufacturing of installations, equipment, tanks and other machinery used for handling and operation with this fertilizer.