Jul 9, 2013 by Kate Sebastian

Last March at the Africa Agriculture GIS Week in Addis Ababa, Ethiopia, HarvestChoice team member Kate Sebastian presented the not-so-sneak preview of the Atlas of African Agriculture Research and Development.

May 23, 2013 by Jawoo Koo

Where in sub-Saharan Africa is the difference between actual and potential yield of maize most striking? We can answer this question pixel by pixel, region by region, but for the purpose of this brief analysis, let’s talk countries.

Dec 16, 2010 by Jawoo Koo

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.

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

Aug 12, 2010 by Jawoo Koo

As a quick demonstration to estimate crop yield levels at regional-scale with various management assumptions, this post describes how crop systems models can be used to assess yield gap of rainfed maize due to the limited supply of soil nitrogen. This methodology can help researchers to find what is the most critical factor that limits crop yield productivity in a given environment condition and how to address the constraint.

Aug 5, 2010 by Jawoo Koo

Not only crop growth and yield, crop models can be also used to estimate potential damages from pest/disease through a predefined set of damage pathways, or coupling points.

Army worm damage on corn