Potential of Cowpea Variety Mixtures to Increase Yield Stability in Subsistence Agriculture: Preliminary Results

Table 3

Stability (expressed by ecovalence) of grain yield of individual cowpea varieties and their possible mixtures grown at NaSARRI, Serere, Kikota, and Kogili villages in Uganda during the first cropping season of 2008.

Treatment	Mean leaf; DM yield (g/m^2)	Ecovalence value 𝑊𝑖	Mean grain yield_H (g/m^2)	Ecovalence value 𝑊𝑖	Mean grain yield_NH (g/m^2)	Ecovalence value 𝑊𝑖
A	3.7	0.67	34.7	894.84	28.9	69.90
B	6.3	2.15	28.2	52.38	36.7	104.82
C	6.7	0.77	17.9	12.50	25.5	84.25
D	4.6	5.03	12.1	65.64	21.0	44.16
Mean	5.3	2.16	23.3	256.34	28.0	75.78
E	2.4	1.01	16.5	28.09	18.8	28.02
F	4.1	0.28	20.4	78.38	16.4	33.38
Mean	3.3	0.65	18.5	53.24	17.6	30.70
A + B	4.6	0.11	14.7	63.14	25.4	7.18
A + C	5.5	0.74	23.3	5.71	22.8	35.18
A + D	3.9	2.35	12.3	102.03	18.8	51.22
B + C	6.7	1.15	19.7	11.84	30.3	46.65
B + D	5.9	0.06	21.5	4.45	23.4	66.29
C + D	6.6	1.44	21.0	14.72	25.2	26.33
Mean	5.5	0.98	18.8	33.65	24.3	38.81
A + B + C	5.6	0.26	16.7	18.64	27.7	30.83
A + B + D	5.2	0.36	25.1	42.48	29.1	9.58
A + C + D	4.7	0.44	17.1	173.03	23.7	37.60
B + C + D	5.7	1.55	22.3	4.87	23.0	125.22
Mean	5.3	0.65	20.3	59.76	25.9	50.81
A + B + C + D	5.1	0.15	22.3	47.61	25.2	41.13
Overall mean ± SE	5.1±0.29	1.09	20.3±1.5	95.31	24.8±1.57	49.51

H: leaf-harvested plants, NH: non-leaf-harvested plants.