Springer just published a book entitled "Improving Soil Fertility
Recommendations in Africa using the Decision Support System for
Agrotechnology Transfer (DSSAT)"

The book gives a detailed description of the application of DSSAT in
simulating crop and soil processes within various Agro-ecological zones
in Africa. The book, an output of a series of 3 workshops, provides
examples of the application of DSSAT models to simulate nitrogen
applications, soil and water conservation practices including effects of
zai technology, phosphorus and maize productivity, generation of genetic
coefficients, longterm soil fertility management technologies in the
drylands, microdosing, optimization of nitrogen x germplasms x water,
spatial analysis of water and nutrient use efficiencies and, tradeoff
analysis. The minimum dataset requirements for DSSAT is discussed. This
book arises from attempts to address the limited use of models in
decision support by African agricultural (both soil scientist and
agronomists) scientists.

For further information, please see the following web site:
http://www.springer.com/life+sciences/agriculture/book/978-94-007-2959-9