The parallel coordinate plot is proposed as an efficient tool for visualization of 13 traits of “stay-green” maize(Zea mays L.) cultivar exposed to different methods of magnesium application. The field experiment was conducted in the Department of Agronomy, Poznań University of Life Sciences, on the fields of the Department of Teaching and Experimental Station in Swadzim in 2006–2008. Experiment was conducted as a single-factor experiment with seven applications of magnesium in a randomized complete block design with four replicates. The highest mean values of grain yield and 1 000-grain weight were obtained after application of variant T3 of magnesium(10 kg MgO ha–1 soil) in the all three years of study. The parallel coordinate plot is proposed as an efficient tool for visualization of 13 traits of “stay-green ” maize (Zea mays L.) cultivar exposed to different methods of magnesium application. The field experiment was conducted in the Department of Agronomy, Poznań University of Life Sciences, on the fields of the Department of Teaching and Experimental Station in Swadzim in 2006-2008. Experiment was conducted as a single-factor experiment with seven applications of magnesium in a randomized complete block design with four replicates. The highest mean values ​​of grain yield and 1000-grain weight were obtained after application of variant T3 of magnesium (10 kg MgO ha-1 soil) in the all three years of study.