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Fig. 3. Comparison of measurements of NO–3–N (µg g–1) extracted from oven-dried and fresh winter wheat samples (Feekes growth stage 7 and 10.1) using the field nitrate reductase kit with either visual (F-NaR vis) or spectrophotometer (F-NaR abs) quantification of the Greiss-Ilosvay reaction color. Inset plots depict results of paired t-test; the mean difference is shown as the horizontal solid line, with the 95% confidence interval above and below depicted as dashed lines.
