National Agronomic Research Center

La Côte-Saint-André, France

National Agronomic Research Center

La Côte-Saint-André, France
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GNAHOUA J.-B.G.,Ghent University | GNAHOUA J.-B.G.,Félix Houphouët-Boigny University | ETTIEN D.J.B.,Félix Houphouët-Boigny University | N'ZUE B.,National Agronomic Research Center | And 4 more authors.
Experimental Agriculture | Year: 2016

In order to intensify cassava production in southern Côte d'Ivoire, multiple farmers’ field trials were carried out in two important cassava-producing areas (Dabou and Bingerville). The effectiveness of an Integrated Soil Fertility Management (ISFM) approach as intensification pathway was evaluated for poor sandy soils. Overall, ISFM-based systems outperformed the local cultivation system. The average cassava yield was 14.5 and 6.5 t ha−1 and 12.6 and 5.7 t ha−1 for the ISFM and traditional systems, in Dabou and Bingerville, respectively. The average profitability of ISFM systems was ca. 2500 Euro ha−1, whereby 66% was generated by cowpea intercrop, which yielded on average 3.1 t ha−1. Taking into account the limited farmer's resource endowment and poor soil fertility, ISFM is a crucial component for sustainable intensification of cassava production and poverty alleviate in southern Côte d'Ivoire. Copyright © Cambridge University Press 2016

Gnahoua J.G.,Ghent University | Gnahoua J.G.,Félix Houphouët-Boigny University | Ettien D.J.B.,Félix Houphouët-Boigny University | N'zue B.,National Agronomic Research Center | And 2 more authors.
Agroecology and Sustainable Food Systems | Year: 2016

In Côte d’Ivoire, smallholder farmers cultivate cassava on poor, highly weathered soils without improved varieties or fertilizer inputs. Land pressure combined with high demand result in premature harvests and low yields. Furthermore, subsistence agriculture limits the adoption of input-intensive technologies. This study aimed at identifying integrated soil fertility management systems for increasing cassava productivity and profitability in two locations in southern Côte d’Ivoire. The integrated technical interventions included improved cassava genotypes and modified spacing, legume intercropping, and application of fertilizer at moderate doses. Overall, an improved cassava variety (Yavo) generally out-yielded the other varieties at both sites. Legumes performed better at the higher soil fertility site and gave higher grain yield and biological nitrogen fixation in a 2 × 0.5 m cassava spacing compared to 1 × 1 m. The response of cassava to nutrient amendments varied between sites, suggesting the need for site-specific adaptations. Fertilizer application was essential to avoid cassava yield reduction upon legume intercropping as a result of competition for nutrients and N immobilization and delayed re-mineralization of legume residues. Growing legumes, however, substantially increased profitability. Hence, better synchronization of legume sowing, legume residue and fertilizer application in relation to cassava growth phases is needed. © 2016 Taylor & Francis.

Fernand Y.G.,Félix Houphouët-Boigny University | Kone B.,Félix Houphouët-Boigny University | Emile Y.K.,Félix Houphouët-Boigny University | Emmanuel K.K.,National Agronomic Research Center | And 4 more authors.
International Journal of Applied Engineering Research | Year: 2014

Phosphorus (P) deficiency in prevailing acidic soils environment as the humid forest zone of Côte d'Ivoire is threatening rainfed rice production (< 1.5 t ha-1) even when applying P-fertilizer. Two trials of pot experiment were conducted in natural conditions during three months, from March 2012 in the South Côte d'Ivoire, in order to optimize the use of P-fertilizer in rainfed rice cultivation on acid soil. Togo rock phosphate and carbonate calcium were applied as basal fertilizer at the rates of 0, 25, 50 and 75 kg ha-1 respectively combined with nitrogen-N (100 kg ha-1) and potassium-K (50 kg ha-1). Interspecific upland cultivar named NERICA 5 was used and the experiment was designed as a split-plot with three replications for each of the trials. There were significant (p < 0.05) quadratic responses of rice yield to both fertilizer rates respectively in a range of 2-5 t ha-1 and the control of Ca: Mg ratio was likely required for developing P and Ca-fertilizer strategies. The rates of 34 kg P ha-1 and 75 kg Ca ha-1 were recommended for sustaining rice production as 1:2 and 1:1 for the ratios of P:Ca and Ca:Mg respectively. © Research India Publications.

Agbo A.E.,Sudan University of Science and Technology | Brou K.D.,Sudan University of Science and Technology | Gnakri D.,Sudan University of Science and Technology | Kouame C.,World Agroforestry Center | And 2 more authors.
Acta Horticulturae | Year: 2012

In Côte d'Ivoire several leafy vegetables are grown and consumed. However, their maturity stages for consumption are not really defined. So, six leafy vegetables (lagos spinach, jute mallow, roselle, spinach, black nightshade and amaranth) were grown during 2 months at the Agronomic Research Station of Anguededou (Abidjan). They were analysed each weeks for pH, proteins, sugars, fibers, vitamin C, β-carotene, minerals and oxalic acid content. The results revealed that roselle was the most acid leafy vegetable and had the highest oxalic acid content. Protein level decreased during leafy vegetables growth. Total sugars level was constant between the 2nd and 5 th weeks. Lagos spinach had the most elevated fibers content at the 3rd week (37.17% for soluble fiber and 66.1% for insoluble fiber). Amaranth and black nightshade had the highest vitamin C content at 7 th week (64.44 and 66.67 mg/100 g fresh weight (FW) respectively). Moreover, roselle had the highest β-carotene content (64.12 mg/100 g FW, at the 5th week). Phosphorus content of amaranth and black nightshade was the highest at 6th week with respectively 0.45 mg/100 g dry matter (DM) and 0.33 mg/100 g DM. Magnesium level was constant during leafy vegetables growth. Spinach and jute mallow had the highest iron content at the 5th week (70 and 88.8 mg/100 g DM). The most elevated calcium level was found in spinach (3.68 g/100 g DM at the 6th week) and in lagos spinach (4.8 g/100 g DM at the 8th week). On the other hand, the lowest potassium content was in roselle (1.84 g/100 g DM at the 8th week). The propitious period for leafy vegetables consumption is between the 3rd and the 5 th weeks of growth because nutrients levels are maximal.

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