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In early 80's in Nigeria I was working on rural water supply programme where we had areas of black cotton soils. As far as I recall we rarely tried to put in anything where black cotton soils were thick. Indeed villages tended not to be based where bcs were thickest. When we did drill in these areas we often had problems - not least logistics in the wet season as roads became quagmires and many vehicles were stuck, damaged etc.

Yields in these areas were often low and poor quality as bedrock was a black shale formation.