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According to the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), 25,000 farm families in Burkina Faso, Mali and Niger have significantly improved yields of sorghum, maize and millet by adding just a ''three-finger pinch'' (six grams) of fertiliser when planting seeds or within three weeks of sowing.
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Reference
FreshPlaza 10/09 African crop yields benefit from 'pinch' of fertiliser