1. Tropical Soil Biology and Fertility: A Handbook of Methods, Wallingford, UK;Anderson,1993
2. Quantifying the occurrence and ameliorating the properties of non-responsive soils by inorganic and organic fertilizers;Assenga;Int. J. Plant Soil Sci.,2016
3. Microfertilizing sorghum and pearl millet in Mali – agronomic, economic and social feasibility;Aune;Outlook Agric.,2007
4. Microdose and N and P fertilizer application rates for pearl millet in West Africa;Bagayoko;Afr. J. Agric. Res.,2011
5. Africa Soil Health Consortium: Handbook for Integrated Soil Fertility Management;Bationo,2012