A Johannesburg biotech start-up specialising in bacteria-based solutions has developed a nitrogen-fixing product that it says yielded a 75% average profit increase for fruits and crops in multiple trials.

Custom Chemistry founder Gerhard Vermaak said the product, EL-I Tech, uses bacteria to create crop food — at a fraction of the cost of conventional fertiliser. After multiple trials, the company found that the innovation works on a large, predictable scale...

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