Dakar — How do you manage the trick of feeding school children better and at a lower cost? How do you count the number of mangoes on your farm so that you get a fair price? And what is a clever-but-cheap way for a farmer to cut down his irrigation bill? Agriculture in sub-Saharan Africa may have the image of relentless toil and low productivity, but experts say new tech is changing the picture. Farmers, crop buyers and other sector professionals have started to harness smart gadgets and crunch numbers to improve productivity, reduce costs and smooth out wrinkles in the markets, they say.

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