Varietal Trials and Physiological Components Determining Yield Differences among Cowpea Varieties in Semiarid Zone of Nigeria
Table 3
Correlation coefficients between cowpea varieties, grain yield, and other parameters tested in 2010 and 2011 at Maiduguri.
GY
DFF
SE2W
DFPF
FY
HGW
HI
DPM
PAR
PDP
SW
MSHG
SMSM
SP
YPP
GY
1.00
DFF
−0.66**
1.00
SE2W
−0.10
−0.24
1.00
DFPP
−0.78**
0.83**
−0.01
1.00
FY
−0.25
0.50**
0.04
0.49**
1.00
HGW
−0.55**
0.76**
−0.08
0.74**
0.32*
1.00
HI
0.74**
−0.66**
−0.21
−0.79**
−0.61**
0.50**
1.00
DPM
−0.49**
0.84**
−0.25
0.76**
0.46**
0.81**
−0.46**
1.00
PAR
−0.10
0.25
0.22
0.30*
0.41**
0.28
−0.40**
0.29*
1.00
PDP
−0.38**
0.32*
0.18
0.38**
0.05
0.48**
−0.21
0.33*
0.07
1.00
SW
0.64**
−0.63**
0.25
−0.64**
−0.29*
−0.54**
0.34*
−0.69**
0.14
−0.29*
1.00
MSHG
0.12
0.09
−0.20
−0.05
−0.17
0.11
0.18
0.30*
0.09
0.07
−0.12
1.00
SMSM
0.40**
−0.45**
−0.26*
−0.53**
−0.74**
−0.34*
0.68**
−0.43**
−0.58**
−0.12
0.23
0.02
1.00
SP
0.51**
−0.09
−0.42**
−0.40**
−0.06
−0.15
0.62**
0.08
−0.36*
−0.08
−0.16
0.20
0.33*
1.00
YPP
0.63**
−0.44**
−0.01
−0.61**
−0.24
−0.38**
0.70**
−0.38**
−0.16
−0.19
0.28
−0.01
0.33*
0.52**
1.00
GY: grain yield, SMSM: soil moisture suction measurement, DFF: days to first flowering, DFPF: days to 50% flowering, PAR: photosynthetically active radiation, PDP: pod development period, DPM: days to physiological maturity, HGW: 100-grain weight, SP: shelling percentage, HI: harvest index, SE2W: seedling establishment 2 WAS, YPP: yield per plant, SW: shell weight, FY: fodder yield, highly significant at 1% probability level, and significant at 5% probability level.
