1. Abera T, Feyissa D, Yusuf H (2005) Effects of inorganic and organic fertilizers on grain yield of maize-climbing bean intercropping and soil fertility in western Oromiya, Ethiopia. Conference on International Agricultural Research for Development, October 11–13, 2005 Stuttgart-Hohenheim
2. Addo-Quaye AA, Darkwa AA, Ocloo GK (2011) Yield and productivity of component crops in a maize-soybean intercropping system as affected by time of planting and spatial arrangement. J Agric Biol Sci 6(9):50–57
3. Adeniyan ON, Akande SR, Balogun MO, Saka JO (2007) Evaluation of crop yield of African yam bean, maize and kenaf under intercropping systems. Am-Eurasian J Agric Environ Sci 2(1):99–102
4. Africa Soil Health Consortium (2012) In: Fairhurst T (ed) Handbook for integrated soil fertility management. CAB International, Nairobi
5. Amara DG, Mourad SM (2013) Influence of organic manure on the vegetative growth and tuber production of potato (solanum tuberosum L. varspunta) in a Sahara desert region. Int J Agric Crop Sci 5(22):2724–2731