Research Article
Effect of Irrigation and Preplant Nitrogen Fertilizer Source on Maize in the Southern Great Plains
Table 7
Single degree-of-freedom contrast results for differences in treatment groupings for grain yield, N use efficiency (NUE), and water use efficiency (WUE) for Lake Carl Blackwell, OK (LCB), in 2012 and 2013. Results listed under the “Main” column heading are the results of data pooled across irrigated and rain-fed treatments. Values in parenthesis are the difference in mean values for the group after the “versus” subtracted from the mean value of the group before the “versus.”
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Units: grain yield: kg ha−1; NUE: percent; WUE: kg ha−1 mm−1. bns: not significant at the 0.10 level. Significant at the 0.10, 0.05, and 0.01 level, respectively. |