RESPONSE OF MAIZE TO PHOSPHORUS AND NITROGEN FERTILIZERS ON A SOIL WITH LOW PHOSPHORUS STATUS by PIETER-ERNST COETZEE (2006008508) Submitted in partial fulfilment for the requirements of the degree Magister Scientiae Agriculturae Department of Soil, Crop and Climate Sciences Faculty of Natural and Agricultural Sciences University of the Free State BLOEMFONTEIN 2013 Supervisor: Dr G.M. Ceronio Co-supervisor: Prof C.C. du Preez