Working Document Series Open Access Factors Influencing Levels of Knowledge in Soil Fertility Management in the Central Highlands of Kenya J.M. Macharia · M.W. Mucheru-Muna · D.N. Mugendi · J.N. Mugwe Soil nutrient depletion is one of the major biophysical constraints affecting agricultural production in Sub Saharan Africa. Despite past research developing soil fertility management options, few of the recommendations from this research … RUF-32692 2012 CC BY 4.0 18 May 2014