The stem girth of the cowpea varieties cultivatedon the polluted soils was significantly (p<0.001) widerthan those cultivated on control soils. There was nosignificant difference in the stem girth among thevarieties (p = 0.328) and replicates (p = 0.909). IT95K-1491 variety had the widest stem girth of 7.76 cm in thepiggery soils (Fig. 2). Meanwhile the stem girth ofvariety IT845-249 was poorly developed in gasolinepolluted soils (2.37 cm) (Fig. 2).
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