“…The potential of cow dung, poultry droppings, refuse compost and farmyard manure as suitable soil amendments in the tropics has been reported [1,2,3,4]. Application of organic materials as fertilizers provides growthregulating substances and improves the physical, chemical and microbial properties of the soil [5,6,7,8]. Sole use of organic manures to sustain cropping has, however, been reported inadequate, as they are required in rather large quantities to meet crops' nutrient requirements because of their relatively low nutrient content [9].…”