Greenhouse and field studies were conducted at Samaru, Zaria (11o 11" N, 7o 38" E ) in the Northern Guinea Savanna agro ecological zone of Nigeria to evaluate cow dung management options that could best conserve nutrients contained in the cow dung thereby improving its quality before application to the field, the effect of cow dung application to the field on nutrient content and availability to crops in the soil and the individual and combined effects of cow dung and urea fertilizer on soil chemical properties and the yield and yield components of maize. Treatments consisted of first...