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Box plot of GPD for the set of six cultivars for each year of growth (2008-2009, 2009-2010 and 2010-2011) as means across growth sites within each year, N fertilizing level and rep for the six cultivars: 1, Cordiale; 2, Hereward; 3, Istabraq; 4, Malacca; 5, Marksman; 6, Xi19 ranked by their median. The boxes are the interquartile range (IQR) 25 % percentile to the 75 % percentile, covering 50 % of the values within the boxes, and the whiskers are marked outside 1.5 times the IQR.
