They put it in their mouth and taste it. A sharp tang is taken as a sign of good quality, but a bland taste means the product is likely to be rejected.
The hit-and-miss approach endangers the health of farmers due to the chemicals in the fertiliser, while crop yields are not maximised as they could be, Kamaldeen Raji, managing director at AFEX Fair Trade, tells The Africa Report. Education, he says, is the only solution.
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