research agronomy cassava agriculture tanzania international institute of tropical agriculture african cassava agronomy initiative nigeria bill and melinda gates foundation africa science fertilizer machine learning iita akilimo mobile application development improved crop management acai food security data maize field trials international institute of tropical institute innovation reaserch improved yield tillage mixed farming programming database zanzibar water use wageningen west africa eth zurich php food artificial intelligence researc smallholder farmers joy adiele east africa dssat crop simulation model systems approach agronomic africa cassava agronomy initiative best planting practices ari meda african cassava agronomy notore psaltry oysca cava-ii decision support tools ministry of agriculture technology
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