Fig. 3. One-to-one graph of seed yield (kg ha^–1) in the ZeroN treatment (x axis) plotted against seed yield in the PlusN treatment (y axis) across all management practices (years, cultivars, herbicide, and Mn treatments) and irrigation environments (irrigated and nonirrigated). The data points represent 35 paired (ZeroN vs. PlusN) samples (i.e., 70 observations with four replications each).