[jeffreyrogers]

The important aspects of agriculture were mechanized/automated decades ago. There's a lot of room for growth in Africa[1] just by taking tech that's old but works and using it there. If it has to be marketed as SV style entrepreneurship that's fine, but I doubt any of the tech layered on top will be a real driver of productivity.

[1]: The caveat is that heavy mechanization is capital intensive and since labor costs are lower in Africa the optimal mix of mechanization will be different than in the US. It also leads to centralization and larger farms which is sometimes undesirable for political/cultural reasons.