s:333:"%T Conservation agriculture with trees in sub-Saharan Africa: case studies from four countries 
%A Mowo G J 
%A Mkomwa S 
%A Garrity, D.P. 
%A Muriuki J K 
%X Fertilizer use around 8 -10 kg/ha/ yr (Costs, transport, adulteration) Nutrient mining USD 4 billion worth of fertilizer lost / year Add nutrient loss through erosion 
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