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The influence of pig manure, urea and their combinations on the performance of Amaranthus cruentus was investigated for two years in a rainforest Ultisol of Umudike. The experiment was laid down in a randomized complete block design with four replications. Six treatments consisted of pig manure applied at equivalent rates of 90 kg N/ha as full dose of manure, urea at 60 kg N/ha as full dose of urea. Other treatments were ½ dose of manure (45 kg N/ha) + ½ dose of urea (30 kg N/ha), ¼ dose of manure (22.5 kg N/ha) + ¾ dose of urea (45 kg N/ha), ¾ dose of manure (67.5 kg N/ha) + ¼ dose of urea (15 kg N/ha), and the absolute control. Results indicated that Amaranthus plant height was not significantly (P >0.05) affected by the treatments compared to the control. The overall results showed that the combination of ½ manure + ½ urea significantly (P < 0.05) increased stem girth (17.42 cm), number of leaves per plant (44.76), fresh yield (41.51 t/ha) and dry matter yield (3.49 t/ha) of Amaranthus than sole application of either of them, and is therefore recommended as the best for optimum production of Amaranthus in the study area.

Comparative effect of pig manure, urea fertilizer and their combinations on the performance of Amaranthus cruentus in a rainforest Ultisol, Nigeria