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Agriculture --- -Agriculture --- -63.001.5 <6> --- <66/67> --- 63.001.5 <6> Agricultural research--Afrika --- Agricultural research--Afrika --- Farming --- Husbandry --- Research --- -Agricultural research--Afrika --- States and territories south of the Sahara. Sub-Saharan Africa --- 63.001.5 <6> --- Industrial arts --- Life sciences --- Food supply --- Land use, Rural

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Third World: agricultural and food problems --- Agriculture --- Research --- On-farm. --- Expérimentation --- experimentation --- Expérimentation au champ --- Field experimentation --- Prise de décision --- Decision making --- design --- Évaluation --- evaluation --- Méthode statistique --- Statistical methods --- 631.421.1 --- 63.001.5 <6> --- -Agriculture --- -57.087.1 --- Farming --- Husbandry --- Industrial arts --- Life sciences --- Food supply --- Land use, Rural --- Field experiments. Field trials --- Agricultural research--Afrika --- -On-farm --- Biometry. Statistical study and treatment of biological data --- 57.087.1 Biometry. Statistical study and treatment of biological data --- 63.001.5 <6> Agricultural research--Afrika --- 631.421.1 Field experiments. Field trials --- 57.087.1 --- Research&delete& --- On-farm --- experimentation. --- evaluation. --- Developing countries: agricultural and food problems --- On-farm research, Agricultural --- On-farm trials, Agricultural --- Farms --- Field experiments --- On-farm research --- Agriculture - Research - On-farm --- Agriculture - Research - Africa - On-farm