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Poultry manure nitrogen availability influences winter wheat yield and yield components por Savala, C.E.N., Crozier, C.R., Smyth, T.J.

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Growth and yield responses of cowpea to inoculation and phosphorus fertilization in different environments por Boahen, S., Savala, C.E.N., Chikoye, David, Abaidoo, Robert C.

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