Fig. 3. Effect of partial root-zone irrigation on water use of maize under different
ratios of organic to inorganic N. Irrigation refers to irrigation method and Ratio refers
to ratio of inorganic to organic N fertilizer. Data points are means
standard deviations
(n = 3). Different letters indicate significant difference (P < 0.05). P values were
shown: P < 0.05, significance; P < 0.01, markedly significance; P > 0.05, no significance.