string: Although most farmers in SSA usually apply less than 5 t ha-1 year-1, researchers often recommend application of large quantities of manure alone or in combination with inorganic fertilizer (Adamu et al. 2015; Dunjana et al. 2012; Nyamangara et al. 2003; Tilahun et al. 2013; Zingore et al. 2008).