Fig. 2. One-to-one graph of Biomass N (g N m^–2) in the ZeroN treatment (x axis) plotted against Biomass N in the PlusN treatment (y axis) across all management practices (years, cultivars, herbicide, and Mn treatments) and irrigation environments (irrigated and nonirrigated). Biomass N was calculated from the N concentration (%N) and the aboveground biomass (g m^–2). The data points represent 46 paired (ZeroN vs. PlusN) samples (i.e., 92 observations with four replications each).