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Fig. 4. Nitrogen use efficiency indexes, N in aboveground biomass per unit N applied as fertilizer (RNUF), nitrate leaching per unit N applied as fertilizer (NLC), and grain yield per unit NO₃–N leached (NUEL) versus the amount of available N applied for the high leaching fraction (LF) treatments. *Significant at the 0.05 probability level. **Significant at the 0.01 probability level.