Are Kenyan farmers under-utilizing fertilizer? Implications for input intensification strategies and research

By Megan Sheahan, Roy T. Black, T. Jayne. 2013

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Review: Taking stock of Africa’s second-generation agricultural input subsidy programs (2018, background): “However, most studies that compute both average and marginal VCRs are similar because of the relatively low levels at which fertilizer is used in subSaharan Africa (e.g., Xu et al., 2009a,b; Sheahan et al., 2013).”
Effects of rising rural population density on smallholder agriculture in Kenya (2014, background): “Moreover, especially in densely populated areas, soils have been continuously cultivated and are facing fertility constraints that make them less responsive to inorganic fertilizer (Drechsel et al., 2001; Marenya and Barrett, 2009; Tittonell and Giller, 2012; Sheahan et al., 2013).”
Limits to Green Revolution in rice in Africa: The case of Ghana (2017, methodology): “We used both the selling price of rice (the usual metric for calculating the marginal and average value product of output, see Sheahan, Black, and Jayne 2013) as reported by the sample farmers and the buying price of rice using the district-averaged purchasing price, which is a better measure of…”