Purpose: Field and nursery experiments were conducted in Akure in the rainforest zone of Nigeria to evaluate the effects of
woodash, pig, goat and poultry manures on the soil fertility improvement, growth, grain yields parameters, crude fibre, crude ash,
protein and nitrogen of wheat (Triticum aestivum L) in 2014 and 2015 cropping seasons.
Methods: The four (4) organic fertilizer treatments were applied each at 6t/ha with a reference treatment NPK 15-15-15
fertilizer applied at 300kg/ha and a control treatment which were replicated four times and arranged in a randomized complete
Results:The results showed significant increases (P<0.05) in the soil nutrients, growth and grain yield, crude fibre, protein,
nitrogen, crude ash, straw yield and root biomass of wheat under different organic fertilizers application compared to the control
treatment. The highest values of wheat plant height, leaf area, number of tillers, stem girth, number of spikelets/plant, leaf
population, straw weight, root biomass, grain yields, crude fibre, crude ash, nitrogen and protein were obtained with the application
of poultry manure followed by NPK 15-15-15 fertilizer, pig, goat manures and wood ash respectively. Wheat grains yield, straw
weight, root biomass, crude fibre, % nitrogen, crude fibre and crude ash, plant height leaf area, number of tillers, stem girth, number
of spikelets/plant and leaf population increased by 13%, 2%, 1%, 27%, 33% , 33%, 27%, 14%, 10%, 2%, 11% and 15% respectively
with the application of poultry manure compared to NPK 15-15-15 fertilizer. Wood ash application produced the highest values of
soil pH, K, Ca and Mg while the application of poultry manure treatment gave the highest values of Soil O.M, N and moderate values
of P, K, Ca and Mg. NPK 15-15-15 fertilizer application decreased soil O.M, Ca, Mg and had the highest K/Mg, K/Ca and P/Mg ratios
of 85:1, 127:1 and 1280:1 compared to 3:1 K/Ca, K/Mg 4:1 and P/Mg 57:1 in poultry treatment.
Conclusion: Poultry manure applied at 6t/ha gave the best results in improving soil properties, growth, grain yield crude ash,
crude fibre, nitrogen and crude protein of wheat and this was because of its balanced nutrient contents and the least C/N ratio which
enhanced faster decomposition and uptake of nutrients.
Keywords: Domestication; Growth; Yield of wheat; Soil fertility improvement; Proximate analysis and organic fertilizers