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Larbi, Asamoah ,  Addul Rahman, N. ,  Kotu, B. ,  Hoeschle-Zeledon, Irmgard ,  Akakpo, D.B. ,  Mellon, S.B. ,  [Nitrogen rate and variety effect on profitability of maize production in northern Ghana] ,  Nitrogen rate and variety effect on profitability of maize production in northern Ghana

Larbi, Asamoah ,  Addul Rahman, N. ,  Kotu, B. ,  Hoeschle-Zeledon, Irmgard ,  Akakpo, D.B. ,  Mellon S.B. ,  [Integrated soil fertility management affect profitability of soybean in northern Ghana] ,  Integrated soil fertility management affect profitability of soybean in northern Ghana