AMMI Stability Analysis and Estimation of Genetic Parameters for Growth and Yield Components in Cassava in the Forest and Guinea Savannah Ecologies of Ghana
Table 4
AMMI analyses of variance for 20 cassava genotypes evaluated at 12 months after planting in two ecologies of Ghana for growth, storage root yield, and related traits.
Source
Mean squares
df
Plt_ht (cm)
St_diam (cm)
Ht_branch (cm)
Rt_yld (t/ha)
DM%
HI
CMD score (1–5)
Treatments
79
Genotypes ()
19
Environments ()
3
Block
8
1037.00
60.70ns
26.46ns
57
IPCA1
21
IPCA2
19
0.08ns
13.32ns
Error
152
736.00
0.08
436.00
63.20
13.25
0.010
0.12ns
Source
Sum of squares
df
Plt_ht (cm)
St_diam (cm)
Ht_branch
Ry_yld (t/ha)
DM (%)
HI
CMD score
Treatments
79
1154016.00
27.32
420944.00
35030.00
3222.00
1.92
285.00
Genotypes ()
19
181421.00
8.77
348166.00
11479.00
1743.00
0.89
248.67
Environments ()
3
894144.00
8.30
178757.00
13154.00
315.00
0.49
134.25
Block
8
8294.00
2.45
116235.00
486.00
212.00
0.11
52.72
57
78452.00
10.25
13874.00
10397.00
1163.00
0.54
6.42
IPCA1
21
39381.00
7.65
53174.00
6815.00
688.00
0.37
61.69
IPCA2
19
27380.00
1.43
27470.00
3236.00
253.00
0.13
52.93
Error
152
111801.00
12.59
10944.00
9477.00
2001.00
0.60
2.03
% treatment SS due to
19
15.72
32.10
51.34
32.77
54.10
46.22
53.99
% treatment SS due to
3
77.48
30.38
33.38
37.55
9.78
25.39
21.20
% treatment SS due to
57
6.80
37.52
15.27
29.68
36.10
28.38
24.81
% SS due to IPCA1
21
50.20
74.63
51.66
65.55
59.16
67.36
85.80
% SS due to IPCA2
19
34.90
13.95
27.76
31.12
21.75
23.77
10.93
at , , and , respectively, ns = not significant (), df = degree of freedom, Plt_ht = plant height (cm), Stem diam = stem diameter (cm), Ht_branch = height at first branching (cm), Rt_yld = storage root yield (t/ha), DM% = dry matter content (%), HI = harvest index, and CMD_Score (1–5) = cassava mosaic disease score (based on scoring chart where 1 denotes no symptom and 5 denotes highly diseased plants).
