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Experiments were conducted in the growing seasons of 2005 and 2006 at Ibadan,Nigeria, in the degraded tropical rain forest zone to assess the growth and yield ofmaize with Nitrogen-enriched organic fertilizer made from municipal waste and cowdung (2.5t ha-1 Pacesetter fertilizer + 100kg ha-1 urea)and also with Nitrogen-fortifiedpoultry manure. Their performance was compared with those of inorganic NPKfertilizer and no fertilizer control. Maize growth was significantly (P=0.05) affectedby an enrichment of the organic manures. They had plants comparable in height withinorganic fertilizer application. At harvest, plants treated with fortified poultry manurewere about 259cm tall while those treated with fortified Pacesetter fertilizer and theplants treated with inorganic fertilizer were about 253cm tall. Average plant leaf areaswere similar with the fortified fertilizers and with inorganic fertilization. Length ofdays taken to achieve 50% tasselling was also reduced with fertilization. Inorganicfertilizer application gave plants that achieved 50% tasselling in 50days whilefortified poultry manured - plants took 52days and the fortified Pacesetter fertilizer –treated plants took 53days. Fertilization of maize gave significantly (P=0.05) higherseed yields. Fortified poultry manure gave an average yield of 3.97t ha-1 whilefortified Pacesetter fertilizer had an average of 3.78t ha-1.Inorganic fertilizer gave ayield of 3.70t ha-1 while a significantly lower yield of 2.48t ha-1 was given by theunfertilized plants. Maize growth and yield from the enriched organic manures werecomparable with inorganic fertilizer, indicating the potentials of the use of fortifiedorganic manures as alternatives to inorganic fertilizers. Poultry manure required lesserN-fortification to give comparable seed yields as cow dung. Although both organicmanures increased the soil N and P, poultry manure gave higher values while the soilK, Ca and Mg contents were more increased with the cow dung than poultry manure.Poultry manure, fortified with 100kg Urea can be applied at 2.5t ha-1 to cultivatemaize. It gives a comparable yield as inorganic fertilizer and increases the soil N andP. Keywords : Maize, organic manures, soil nutrients. AJFAND Vol. 9 (1) 2009: pp. 581-592

Maize growth, yield and soil nutrient changes with N-enriched organic fertilizers