Table 8.

The nitrogen (N) fertilizer rates and planting density in different treatments

Treatments	N fertilizer rates (kg ha−1)	Planting densities (million plants ha−1)	Plant spacing (× 10−2 m)	Line spacing (× 10−2 m)
N0D1	0	0.21	20	23.8
N0D2	0	0.27	20	18.5
N0D3	0	0.33	20	15.2
N0D4	0	0.39	20	12.8
N1D1	135	0.21	20	23.8
N1D2	135	0.27	20	18.5
N1D3	135	0.33	20	15.2
N1D4	135	0.39	20	12.8
N2D1	180	0.21	20	23.8
N2D2	180	0.27	20	18.5
N2D3	180	0.33	20	15.2
N2D4	180	0.39	20	12.8
N3D1	225	0.21	20	23.8
N3D2	225	0.27	20	18.5
N3D3	225	0.33	20	15.2
N3D4	225	0.39	20	12.8

N represents nitrogen; and D represents planting density