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Fig. 6. Seasonal plots of average pore-water and shallow ground water NO3–N concentrations and depth to water with inset plots of the regression line of the seasonal average shallow ground water NO3–N concentrations vs. depth to the water table at the (a) furrow-irrigated and (b) pivot-irrigated management fields. Levels of statistical significance of r values are as follows: ns = not significant, * = significant at 5% level, and *** = significant at 0.1% level.
