Fig. 5. Influence of average N nutrition index (NNI) on relative values of (A) crop dry weight, (B) cumulative intercepted photosynthetically active radiation (PAR), (C) light use efficiency (LUE), and (D) harvest index for wheat at 102 d after emergence (DAE) in 1997 and 86 DAE in 1998. The values are relative to maximum or critical values given in Table 5. Points are for individual replicates. Solid regression lines include all points. NS, nonsignificant at the 0.1 level.

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