Genotype X Environment Interaction and Yield Stability in Early-Maturing Cowpea (Vigna unguiculata (L.) Walp.) Landraces in Ethiopia
Table 7
Joint regression analysis of variance (ER’s model) for grain yield of 25 cowpea genotypes grown at six environments during the 2019 cropping season in Ethiopia.
Source
Df
SS
MS
Total
149
508555146
3413121.8
Genotypes
24
9072930.8
378038.78
Evn. + (gen x env.)
125
41782215
334257.7232
Environment (linear)
1
17321917
Gen x env. (Linear)
24
4107016.6
171125.69
Pooled deviation
100
20353282
203532.82
G1
4
856817.19
214204.30
G2
4
606995.12
151748.78
G3
4
2052402.5
513100.62
G4
4
373236.43
93309.11
G5
4
429181.56
107295.39
G6
4
458759.21
114689.80
G7
4
1208845.2
302211.30
G8
4
1158939.3
289734.82
G9
4
1052930.2
263232.55
G10
4
221744.42
55436.105 ns
G11
4
1364846.2
341211.56
G12
4
654761.56
163690.39
G13
4
939623.1
234905.78
G14
4
155817.54
38954.385 ns
G15
4
422009.65
105502.41
G16
4
976218.16
244054.54
G17
4
556965.53
139241.38
G18
4
1762431.5
440607.88
G19
4
1406098.2
351524.55
G20
4
342277.28
85569.32
G21
4
67484.1
16871.025 ns
G22
4
487173.65
121793.41
G23
4
1502497.6
375624.39
G24
4
337378.94
84344.735
G25 (ch)
4
957847.86
239461.97
Pooled error
300
7300322.8
24334.41
, Significant at and 0.05, respectively, Df = degree of freedom; SS=sum of squares; MS = mean of squares, Env = environments, Gen = genotype.
