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In 2008 and 2009 cropping season, field experiments were conducted to determine the effects that the combined cow dung and NPK 20-10-10 had on both the nodule count and N-fixing ability of two varieties of cowpea (ITAS EARLY and IAR 1060). The treatments were: cow dung (0, 4, 8 t ha -1 ); NPK 20-10-10 fertilizer (0, 150 and 300 kg ha -1 ). Treatments were combined pair-wise to give nine treatments combinations. The experiments were laid-out in a randomized complete block design (RCBD) with three replications. Each experimental plot measured 3 m x 4 m with an alley of 1 m between blocks and 0.5 m between plots. Four seeds were planted per hole at 25 cm plant to plant distance in a maize mixture and later thinned to two plants per stand at two weeks after planting (2 WAP). This gave a total plant population of about 80,000 plants per hectare. The nodule count and N-fixed were determined 3, 6 and 12 weeks after planting (WAP). The combination of cow dung and NPK 20-10-10 contributed to the differences (P < 0.05) in number of count obtained per plant of cowpea as well as the amount of N-fixed in the experiment. The high rate of cow dung and high rate of NPK 20-10-10 did not lead to increase in N-fixed by the cowpea varieties. The highest nodules (82.4 and 88.4) and N-fixed (38.65 and 42.51 kg ha -1 ) for 2008 and 2009 respectively were obtained the sole application of 8 t ha -1 of cow dung without NPK 20-10-10 fertilizer application on cowpea variety, ITAS EARLY. The result of the study shows that cowpea variety ITAS EARLY tolerated high nutrient combinations better than cowpea IAR 1060 in terms of N-fixing ability.

Tolerance of Cowpea (Vigna unguiculata (L) ) Varieties N- fixing Ability to Application of Cow dung combined with NPK 20-10-10.