Samuel Rigu is coy about the secret potion he adds to his fertiliser, revealing only that the brown liquid is called “Safi Proprietary Enhancement Formula”. He’s less shy about the results.
At his processing plant in Mwea, central Kenya, Rigu has found a way of turning agricultural waste into an organic fertiliser that retails at less than half the price of its inorganic alternative.
It’s also more effective and kinder to the soil, his customers and scientists say.
