Concept:Maize requires a well-prepared, loose and weed-free seedbed for good germination and root development.Explanation:Maximum tillage involves thorough ploughing and harrowing to produce a fine, loose soil tilth.This method controls weeds and improves soil aeration, which favours maize establishment and growth.Zero tillage and minimum tillage may not give maize the required seedbed condition, while contour ridges are mainly for erosion control, not tillage.Answer:C. maximum tillage