Countries in the Upper-Middle-Income group include Botswana, Cape Verde, Gabon, MUS, Seychelles and South Africa.

Economies are divided according to 2010 GNI per capita, calculated using the World Bank Atlas method. Based on annual income, the four income groups are:

Low income, $1,005 or less
Lower middle income, $1,006 - $3,975
Upper middle income, $3,976 - $12,275
High income, $12,276 or more

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HarvestChoice Labs

Long-term maize trial plots at the Hatfield Experimental Farm, U of Pretoria

Measured Maize Yield Variability in South Africa (1938-2005)

Long-term yield trials are great resources for agricultural researches in multiple disciplines, but such dataset have not been readily available in Sub-Saharan Africa. The Hatfield Experimental Farm in Pretoria, South Africa, is an exceptional case that has been providing maize yield and fertilizer trial dataset with 32 treatments since 1939. In collaboration with University of Pretoria, HarvestChoice facilitated the re-discovery of raw yield dataset from the trial to study the measured long-term yield variability.

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