Integrated soil fertility management in Africa : principles, practices and developmental process
A Bationo, J N Chianu,K E Giller, Rao Idupulapati, Didier Lesueur,Roel Merckx, U Mokwunye,O Ohiokpehai, F Place, P Pypers,Tabo Ramadjita,Pascal C Sanginga,Canon N Savala, Keith D Shepherd, E M A Smaling,B Vanlauwe, Dorothy Wambui mag(2009)
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