The information from the soil map could help this Tanzanian woman farm with better fertilzers and increase her harvest. Photo: vredeseilanden (flickr)

We have elevation maps, weather maps, and population maps. So why not soil maps? It may be the key to the food security of an entire continent.

Africa has the most depleted soils on earth. A major problem is a lack of information on how to care and maintain land. What type of fertilizer should be used? How much? With which soil type? When should I rotate my crops? How long should I rest my land? Without the answers to these and other questions, the soil is degrading over time, losing nutrients with every harvest, with every harvest getting smaller and smaller. A soil map can answer these questions and, hopefully, help to reverse the trend.

The International Center for Tropical Agriculture (CIAT) is mapping the soil of all 42 countries of sub-Sahara Africa as the first step to building a global map online. The soil map will be created using soil samples and satellite imagery, which will allow for detailed and precise prescriptions for small farmers and their lands. Outreach workers and farmers associations will be trained on how to use the map and translate the information to farmers on their land.

It’s a four-year, $18-million program paid for by the Bill and Melinda Gates Foundation and Alliance for a Green Revolution in Africa (AGRA).

This program has the power to revolutionize agriculture in Africa. Nteranya Sanginga, director of CIAT's Tropical Soil Biology and Fertility Institute has said that "[w]ith accurate soil maps, we find farmers can increase their yields by around 60 percent, and sometimes double." Sounds like a plan for success worth mapping.