Row Spacing, Landscape Position, and Maize Grain Yield
Table 2
Soil water content (0–200 cm depth) close to silking () and at physiological maturity (), maximum fraction of incident PAR intercepted by crops (Maximum fIPAR) and leaf chlorophyll readings (SPAD) close to silking, total biomass production at physiological maturity and grain yield, and harvest index and grain yield components (kernel number, kernel weight, and prolificacy) of maize hybrid DK190MG cultivated with different row spacings (RS) at three landscape positions (P), during 2007/08 (). The significance level of main factors and interactions are detailed at the bottom of the table.
Growing season/location
Landscape position/ plant population
Row spacing
Soil water content
Maximum fIPAR
SPAD units
Total biomass (g/m2)
Grain yield (g/m2)
Harvest index
Kernel number (kernels/m2)
Kernel weight (mg)
Prolificacy Ears/plant
(mm)
(mm)
2007/08
Summit (5.8 plants/m2)
38 cm
39
113
0.71
43.0
1336.7
717.1
0.54
3096
232.7
1.03
52 cm
43
113
0.77
47.6
1639.6
905.6
0.55
3743
241.6
1.37
Skip row
177
222
0.73
46.1
1359.9
731.6
0.54
2973
247.9
1.06
Shoulder-slope (6.8 plants/m2)
38 cm
47
118
0.69
42.6
1418.4
748.2
0.52
3368
221.8
1.00
52 cm
71
137
0.68
45.6
1537.1
806.7
0.51
3395
238.0
1.17
Skip row
62
114
0.69
45.1
1375.1
712.6
0.50
3056
233.4
1.04
Foot-slope (7.8 plants/m2)
38 cm
477
564
0.89
52.4
2009.0
1096.0
0.54
4340
252.0
1.00
52 cm
503
607
0.91
56.0
2125.8
1168.6
0.55
4403
265.5
1.07
Skip row
366
415
0.90
53.8
2180.5
1202.7
0.55
4621
262.1
1.18
Significance level of main effects and interactions and critical values for comparisons of the means (in brackets)
