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Fig. 4. Effect of nitrogen treatments on the total nitrogen uptake (g) in different parts of a maize plant averaged over three hybrids. The nitrogen treatments are N1, N supplied from V8 to maturity; N2, N supplied from seedling emergence to V8; N3, N supplied from seedling emergence to silking; N4, N supplied from seedling emergence to 3 wk after silking; and N5 (control), N supplied from seedling emergence to physiological maturity. The bars with the same letter within each plant part are not statistically significant at P < 0.05.
