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Effects of plant density (LPD – 160 plants/m2; HPD – 280 plants/m2) and emitter spacing (NE4 – emitters 25.0 cm apart; NE8 – emitters 12.5 cm apart) on leaf blade and petiole nitrate concentration. Means with different letters are significantly different at p < 0.05. Each bar represents the mean of five replicates, and the error bars represent ±1 SE.
