Mineral fertilizer management of maize on farmer fields differing in organic inputs in the West African savanna

By M. Wopereis, A. Tamélokpo, K. Ezui, D. Gnakpénou, B. Fofana, H. Breman. 2006

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State-conditional Fertilizer Yield Response on Western Kenyan Farms (2009, unknown): “For example, Wopereis et al. (2006) mention that, in organic matter rich fields in Mali, applying fertilizer at rates more than 100 kg N per hectare leads to diminishing marginal returns.”
Unravelling the effects of soil and crop management on maize productivity in smallholder agricultural systems of western Kenya—An application of classification and regression tree analysis (2008, background): “Third, crops planted in distant fields normally produce poor yields even when nutrients are used, due to the poor soil quality of those fields, leading to weak crop responses to input use (cf. Wopereis et al., 2006).”