Genotype by Environment Interaction on Grain Yield Stability and Iron and Zinc Content in OPV of Pearl Millet in Ghana Using the AMMI Method
Table 7
Combined AMMI analysis of variance for 22 pearl millet OPV genotypes evaluated for growth and yield related traits in two locations over three seasons in Northern Ghana.
Source
Mean squares
d.f.
DFF
DMinc
PH
GY
TSW
Fe
Zn
Treatments
131
122
62.82
4074
861943
9.85
289.2
120.7
Genotypes (G)
21
588.8
220.8
10749
1315549
24.26
1171
322.5
Environments (E)
5
97.6
215.76
36334
6817833
68.18
717.4
604.2
Replication
12
1.6 ns
3.73 ns
400 ns
67178 ns
1.41
13.7 ns
42.7
GxE
105
29.8
23.94
1203
487608
4.2
92.4
57.3
IPCA1
25
69.3
36.05
2430
1277452
8.08
154
91.5
IPCA2
23
34
33.26
1703
418384
4.75
146.5
89.8
Error
252
3.5
4.22
258
83801
1.9
20.5
21.3
Source
Sum of squares
df
DFF
DMinc
PH
GY
TSW
Fe
Zn
Treatments
131
15986
8229
533725
1.1E + 08
1291
37880
15809
Genotypes
21
12365
4637
225725
2.8E + 07
509.4
24590
6773
Environments
5
488
1079
181668
3.4E + 07
340.9
3587
3021
Replication
12
19
45
4805
806132
16.9
165
513
Interactions
105
3132
2513
126333
5.1E + 07
440.7
9702
6015
IPCA1
25
1732
901
60755
3.2E + 07
202
3851
2287
IPCA2
23
782
765
39160
9622827
109.4
3369
2065
Error
252
872
1063
65028
2.1E + 07
477.8
5167
5373
% treat. SS due to G
21
77.35
56.35
42.29
24.47
39.46
64.92
42.84
% treat. SS due to E
5
3.05
13.11
34.04
30.19
26.41
9.47
19.11
% treat. SS due to GxE
105
19.59
30.54
23.67
45.34
34.14
25.61
38.05
% GxE SS due to IPCA1
25
55.3
35.85
48.09
62.38
45.84
39.69
38.02
% GxE SS due to IPCA2
23
24.97
30.44
31
18.8
24.82
34.72
34.33
= significant at , ns = not significant (), d.f. = degree of freedom, IPCA1 = interaction principal component axis one, IPCA2 = interaction principal component axis two, DMinc = downy mildew percent incidence, DFF = days to 50 percent flowering, PH = plant height (cm), GY = grain yield (kg/ha), and TSW = thousand-seed weight (g).
