(2.54 cm = 1 inch) Effect of different nitrogen treatments on ear diameter, ear length, and number of kernels per ear (averaged over three hybrids). Nitrogen treatments are as follows: N1 (N supplied from V8 to maturity); N2 (N supplied from emergence to V8); N3 (N supplied from emergence to silking); N4 (N supplied from emergence to 3 weeks after silking); and N5 (N supplied from emergence to maturity). If columns have the same letter within each parameter, they are not significantly different from one another (at P = 0.05). Source: Subedi, K.D., and B.L. Ma. 2005. Crop Sci. 45:740Ã¢â‚¬â€œ747.