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Effect of planting density and nitrogen application on number of big (A–D) and small (E–H) vascular bundles at maize R3 stage in 2016. ND and HD indicate planting density of 67,500 and 90,000 plants ha− 1; N0, N150, and N300 indicate N applied at 0 kg N ha− 1, 150 kg N ha− 1, and 300 kg N ha− 1 levels, respectively. Different letters indicate significant difference at 5% level. Values shown are the mean ± SE (n = 3).
