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Table 1. Cowpea yield (Mg/ha) across environments,
Rio Preto da Eva, Amazonas, Brazil, 1989
LOCATION FP PCW TSP CM El
8 0.10 0.20 1.30 1.65 0.81
13 0.00 0.00 1.30 2.00 0.82
6 0.15 0.50 1.35 1.35 0.84
9 0.20 0.40 1.20 1.70 0.88
2 0.50 0.65 1.10 1.50 0.94
5 0.15 0.50 2.10 2.05 1.20
4 0.60 1.20 1.60 2.25 1.41
1 0.70 0.90 2.30 1.80 1.42
11 1.20 1.50 2.20 1.90 1.70
12 1.50 1.80 2.10 1.70 1.78
3 1.45 1.95 2.50 1.90 1.95
10 2.20 1.90 2.60 1."'0 2.02
7 1.70 1.65 2.65 2.15 2.04
Source: Singh (1990).