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La non disponibilite d’engrais specifiques pour la culture de l’ananas amene les producteurs a appliquer diverses formulations d’engrais qui affectent negativement le rendement de la culture. Dans la perspective de mettre au point une formule d’engrais pour la culture de l’ananas, des experimentations ont ete conduites dans les communes de Ze et Toffo pour tester la reponse de l’ananas aux doses croissantes d’azote (N), de phosphore (P), de potassium (K) et de magnesium (Mg), suivant un dispositif de bloc aleatoire complet a six traitements et quatre repetitions pour chaque elements fertilisants. Le N a ete apporte sous la forme d’uree, le P sous la forme de Triple superphosphate, le K sous la forme de sulfate de potassium et le Mg sous la forme de sulfate de magnesie. Les doses de N, K et Mg ont significativement augmente (p < 1%) la vigueur des plants une semaine avant l’induction florale. Les optimums de nutriments determines etaient : 276 kg N.ha -1 , 121,44 kg P.ha -1 , 415 kg K.ha -1 , et 21,4 kg Mg.ha -1 pour un niveau de rendement variant de 40 a 98 t.ha -1 d’ananas frais dans les deux communes. Ces doses serviront pour formuler un engrais specifique a la production de l’ananas au Benin. © 2018 International Formulae Group. All rights reserved. Mots cles: Fertilite des sols, courbe de reponse, doses optimales, formulation d’engrais, modelisation English Title: Pineapple ( Ananas Comosus L. Merrill) response to simple fertilizer on a ferralsol in southern Benin English Abstract The unavailability of specific fertilizer for pineapple production in Benin let farmers to apply different mineral fertilizer formulae, available in the market. Those formulae reduce  pineapple yield. A study carried out in the Atlantic department, southern part of Benin, aimed at assessing the pineapple response to different level of nitrogen (N), phosphorus (P), potassium (K) and magnesium (Mg) mineral fertilizer in a complete random bloc design with six treatments and four replications. Six doses of specific mineral fertilizer for each nutrient have been tested. Magnesium was supplied in the form of sulphate of magnesia at doses of 0 - 5.35 - 10.7 - 21.4; 32.1 and 42.8 kg K.ha -1 . Optimal doses of N, P, K and Mg were determined using quadratic regression. Results showed that nitrogen, potassium and phosphorus had affected significantly (p < 1%) the vigour of pineapple plant at the moment of flowering induction. Pineapple optimal production need 276 kg.ha -1 of nitrogen, 121.44 kg.ha -1 of phosphorus, 415 kg.ha -1 of potassium and 21.4 kg.ha -1 of magnesium whatever the site. These levels of nutrient provided a yield between 40 and 98 t.ha -1 . These doses of nutrients could be used to formulate a specific fertilizer to improve pineapple production in southern Benin. © 2018 International Formulae Group. All rights reserved. Keywords: Soil fertility, surface response, optimal doses, pineapple fertilization, linear regression

Réponse de l’ananas (Ananas comosus L. Merrill) à la fertilisation minérale élémentaire sur sol ferrallitique au Sud du Bénin