Genotype X Environment Interaction and Yield Stability in Early-Maturing Cowpea (Vigna unguiculata (L.) Walp.) Landraces in Ethiopia

Table 4

Combined ANOVA for grain yield (kg ha⁻¹) of 25 cowpea genotypes tested at five environments.

Source of variation	Degrees of freedom	Sum of square	Mean square	Total variation explained (%)
Genotype	24	26479319.3	1103304.97	20.9
Environment	4	34726016.9	8681504.24	27.45
Rep (env.)	10	2615788.7	261578.87	2.07
Interaction	96	62679547.1	652911.95	49.55
Pooled error	240	11652665.5	48552.8	9.21
Total	374	126500672.0

 = Significant at .