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Legume and mineral fertilizer derived nutrient use efficiencies by maize in a guinea savannah of Cote d'Ivoire

Kone A.W., Tondoh J.E., Aduramigba-Modupe V.O., Deleporte P., Orendo-Smith R., Brunet D.. 2017. Agronomie Africaine, 29 (1) : p. 33-48.

This paper deals with reclamation of marginal savannah lands in central Côte d'Ivoire. It aimed at assessing legume-derived nutrient use efficiencies (NUE) by maize and quantifying the importance of these legumes as nutrient source relative to inorganic fertilizers. Experimentations included eight treatments in a RCB design (n=3): four herbaceous legume-maize successions and four continuous maize cropping with urea (U, 46% N, 50 kg ha-1), triple superphosphate (TSP, 45% P, 30 kg ha-1), urea+triple superphosphate (U+TSP) and a control. The NUE was estimated through Apparent Recovery (AR). In addition, the N- and P-fertilizer replacement indices (N-FRI and P-FRI) by legumes, which express their importance as source of N and P for maize relative to inorganic fertilizers, were estimated. The AR of Nlegume and Plegume by maize varied from 16.6 to 29.1 % and from 29 to 62 %, respectively while those of Nurea and PTSP were only 12 and 4.3 % on U and TSP plots, respectively. Values of legume N-FRIs and P-FRIs suggest that the legumes' impact on maize yield corresponded to that of the application of 131 to 195 kg urea ha-1 and 27.5 to 96 kg TSP ha-1, respectively. Compared to U and TSP, legume-derived nutrients were more efficiently used by maize, particularly nutrients from P. phaseoloides.

Mots-clés : agroécologie; terre marginale; ferralsol; substance nutritive minérale; nutrition des plantes; pueraria phaseoloides; légumineuse; zea mays; côte d'ivoire

Thématique : Biologie du sol; Systèmes et modes de culture; Fertilisation; Méthodes de recherche

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