November 19-23 2018 |Abuja, Nigeria| IFDC
Fertilizers available to smallholder African farmers have for decades concentrated on the NPK macro-nutrients: nitrogen, phosphorus, and potassium. Over the past decade, however, the importance of micronutrients has come to prominence. In this context, micronutrients also include the secondary nutrients calcium (Ca),
magnesium (Mg), and sulfur (S), which are required by plants in the range of 5-40 kg/ha, and the true micronutrients zinc (Zn), boron (B), copper (Cu), iron (Fe), manganese (Mn), and molybdenum (Mo), which are required in much smaller quantities, usually less than 1 kg/ha. When micronutrients are lacking, response to the NPKs can be severely restricted. In some cases, yields can be doubled by micronutrient additions. Crops, like humans, need a full range of nutrients for healthy growth.