Marenya, Paswel P.; Barrett, Christopher B. - In: American Journal of Agricultural Economics 91 (2009) 4, pp. 991-1006
Fertilizer interventions have attained prominence in rural poverty reduction programs in Africa. Using data from maize plots operated by small farmers in western Kenya, we find a von Liebig-type relationship between soil organic matter (SOM) and maize yield response to nitrogen application. Low...