Fig. 3. Measured annual nitrate N load differences between the 5- and 20-m east plots, and regression predictions with 95% confidence limits, over the 15-yr study. Loads from the two plots are significantly different when the confidence limits do not include the 0 difference line. Regression: y = (yr)/(0.0799 + 0.000061yr⁴); R² = 0.78.