Row Spacing, Landscape Position, and Maize Grain Yield
Table 1
Soil water content (0–200 cm depth) at silking () and 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 2006/07 (). 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)
2006/07
Summit (4.5 plants/m2)
38 cm
165
219
0.84
53.0
1540.7
755.0
0.49
3361
229.9
1.73
52 cm
174
228
0.80
54.4
1771.8
901.8
0.51
4037
227.0
1.80
Skip row
177
230
0.80
53.6
1672.2
830.1
0.49
3665
230.3
1.90
Shoulder-slope (6.2 plants/m2)
38 cm
375
416
0.92
53.0
1972.5
941.7
0.47
4097
233.3
1.60
52 cm
374
413
0.90
53.3
2214.1
1084.6
0.49
4606
236.3
1.70
Skip row
382
417
0.92
52.9
2157.2
1061.4
0.49
4730
237.3
1.70
Foot-slope (7.3 plants/m2)
38 cm
480
480
0.92
53.9
2127.6
975.1
0.46
4409
223.4
1.24
52 cm
470
487
0.95
54.4
2350.7
1116.8
0.47
4784
237.0
1.37
Skip row
398
443
0.96
52.7
2261.8
1066.3
0.47
4624
233.3
1.33
Significance level of main effects and interactions and critical values for comparisons of the means (in brackets)
