saline soils in the north, black soils in the northeast, and red and yellow soils in the south. Over six decades, the Institute of Agricultural Resources and Regional Planning (IARRP) at the ...

Soil-borne diseases, such as hookworm and Giardia, inflict many. The larvae of the TseTse flies, which carry sleeping sickness and inhabit large parts of Africa, live in organic-matter-rich black ...