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Comparison in the contents of ammonium (A), nitrate (B), proline (C), and free amino acid (D) in rice plants grown udner different nitrogen and water conditions. Data refers to mean ± SE (n = 4). P-values of the two-way ANOVAs of nitrogen, water, and their interaction are indicated: ns, not significant; ∗P < 0.05; ∗∗P < 0.01; ∗∗∗P < 0.001. Bars with the same letter are not significantly different by LSD test. WD, water deficit; WW, well-watered.
