Figure 7From: Determinants of yield differences in small-scale food crop farming systems in CameroonReal retail prices per metric ton of two main fertilizer types used in Cameroon. Real prices are derived by adjusting for inflation, using 1990 as the base year. Data from 1968 to 2001 are derived from FAOSTAT, accessed in February, 2012. Data for 2010 is derived from fieldwork interviews, carried out in September, 2011.Back to article page