| Sumario: | To increase productivity and efficient fertilizer use, African smallholders need tailored, field-specific advice. A new mobile phone application 'Maize-Nutrient-Manager' piloted in southwestern Tanzania, resulted in ~1,000 smallholder farmers receiving field-specific, balanced nutrient management advice for their maize fields. Advice was provided by the district extension service, supported by the regional Agricultural Research Institute. Bringing this productivity-enhancing, and greenhouse gas emissions reducing, advisory tool to scale, institutionalizes field-specific advisory in national agricultural advisory systems in Tanzania and Ethiopia.
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