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Fig. 5. Linear regressions of grain protein content (g kg–1) for individual treatments at a given environment against the mean grain protein content (g kg–1) of all treatments at that environment. Each of the seven environments is identified along the x axis (T2002; Tidewater Research Station 2002, C2001; Cunningham Research Station 2001, L2001; Lower Coastal Plains Research Station 2001, C2002; Cunningham Research Station 2002, P2002; Piedmont Research Station 2002, P2001; Piedmont Research Station 2001, and P2001nt; Piedmont Research Station 2001 no-till). Four N fertilizer treatments (those receiving a total of 0.0, 67.2, 134.4, and 201.6 kg spring N ha–1 with half the N applied at growth stage 25 and the second half at growth stage 30) are shown.
