Issue
OCL
Volume 31, 2024
Creating new oil & protein crop value chains / Construire de nouvelles filières oléoprotéagineuses
Article Number 12
Number of page(s) 8
DOI https://doi.org/10.1051/ocl/2024010
Published online 03 June 2024

© D. Nikiema et al., Published by EDP Sciences, 2024

Licence Creative CommonsThis is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Highlights

  • Ricinodendron heudelotii shows significant potential as a non-timber forest product in Ivory Coast.

  • Cultivating it in agroforestry could drive economic growth and enhance plant cover.

  • To enhance production and economic growth, it's crucial to broaden markets, upgrade quality, and modernize processing of R. heudelotii products.

1 Introduction

There has been considerable development of oilseed and protein crops in tropical Africa in recent years, with increasing needs for oil and oilcake due to population growth, improvements in living standards and the globalization of markets (OECD/FAO, 2016). This development of oilseed and protein crops is designed to meet the fat and oil needs of the food industry, to generate products for domestic consumption, the cosmetics and pharmaceutical industries and the chemical industry. Nutrient-rich oilcakes from these plants are also a source of protein for domestic animal and livestock feed. Furthermore, agroforestry systems integrating the cultivation of oil-producing plants favor the regeneration of vegetation cover and contribute to the fight against desertification and global warming. With this in mind, interest in this new domesticated species is growing in Africa.

The 33rd Permanent Interstate Committee for Drought Control in the Sahel (CILSS) meeting, held on October 4, 2018, in Ivory Coast, highlighted the importance of non-timber forest products (NTFPs) for strengthening food and nutrition security and the livelihoods of vulnerable households in the Sahel and West Africa.

Ivory Coast has an abundance of NTFPs, but its agriculture and agroforestry are poorly organized. Data on supply, volumes produced, traded and consumed are unreliable and sometimes lacking. NTFPs are not, therefore, integrated into the value chain of economic products. We consider here R. heudelotii (Baill.) Pierre ex Heckel, an oil-protein plant with a lipid and protein content and composition, cultural importance, value as a food and potential profitability rendering it a textbook example for agroforestry. There are several hurdles to be overcome in the cultivation of R. heudelotii linked to the harvesting, production and crushing of the seeds, the limited availability of the species, its traditional uses and the size of current and future markets. These difficulties provide good indicators to guide the improvement of R. heudelotii development as a cash crop through its domestication and the creation and structuring of an autonomous industry in Ivory Coast.

Ricinodendron heudelotii grows over almost the entire territory of Ivory Coast, being found throughout the entire southern zone and part of the northern zone of the country (Nikiema et al., 2019; Kouadio et al., 2020). Unfortunately, R. heudelotii, a source of non-timber forest products, has not escaped the devastation caused by deforestation. A study in Benin (Boko-Haya et al., 2017) reported a significant decline in the number of plants of this species in recent years (Boko-Haya et al., 2021). Several countries, including Cameroon (Shidiki et al., 2021), Ivory Coast (Yapo et al., 2020), Benin (Hounsou-Dindin et al., 2023 Agre et al., 2023; Hounsou-Dindin et al., Hounsode et al., 2023; Hounsou-Dindin et al., 2022; Hounsou-Dindin et al., 2021), and Nigeria (Ogbuagu et al., 2019), have advocated the integration of R. heudelotii into agroforestry systems, as a means of mitigating this problem. The edaphic (well-drained soil rich in trace elements) and climatic (favorable temperature and rainfall levels) conditions in the intertropical zone of Africa are favorable for the cultivation of this plant. However, there are currently no large-scale plantations of R. heudelotii.

Ricinodendron heudelotii is a fast-growing tree that generally grows to a height of 20-30 m, but can reach heights of up to 50 m, with a diameter of up to 150 cm (Shiembo, 1994; Akoègninou et al., 2006). The fruits are initially yellow-green, becoming black at maturity (Plenderleith, 2000). The fruits are drupes containing a maximum of four seeds (Nikiema et al., 2019). The flowering and fruiting periods vary between countries, and sometimes between different regions of the same country. Globally, fructification occurs at some time between May and January, depending on the country and the region (Akoègninou et al., 2006; Plenderleith, 2000). Léonard (1961) described two subspecies, but only one, R. heudelotii subspecies heudelotii, is present in Ivory Coast. R. heudelotii grows over almost the entire territory of Ivory Coast, being found throughout the entire southern zone and part of the northern zone of the country (Nikiema et al., 2019; Kouadio et al., 2020).

In Ivory Coast, the Centre National de Recherche Agronomique (CNRA) has performed domestication trials on experimental fields in the Oumé and Agboville regions (Djaha et al., 2014). This domestication program is supported by the national government through the establishment of the National Project for the Improvement of Forest Governance in Ivory Coast (PNAGF-CI). This program aims to contribute, through good forest governance and adequate funding, to the restoration and sustainable management of forests in Ivory Coast. In the framework of this program, some cocoa farmers are already using R. heudelotii as a shade tree in their fields (Vroh, 2015).

Here, we provide an inventory of R. heudelotii cultivation and of the products that can be derived from this species. We aim to identify the advantages of cultivating this plant and ways to develop its cultivation so that it can play an important economic role in countries like Ivory Coast. We searched the scientific literature and selected the data which relate mostly to current uses, transformation processes, chemical composition and use properties. The aim of the paper was to propose ways of developing R. heudelotii cultivation specific to Ivory Coast, through the possible levers for intervention, the actions and support available to achieve increase the development of the cultivation of R. heudelotii and to carve out an important, environmentally sustainable place for this plant and its products in the economy of the country.

1.1 Uses of Ricinodendron heudelotii (Baill.) Pierre ex Heckel

In some areas of Ivory Coast, particularly in the Marahoué region (Nikiema, 2021), the bark of the trunk and the roots are used in traditional medicine for the treatment of ailments such as coughs, dysentery and stomach aches and many other diseases, as listed by Akpovo et al. (2022). Ash from freshly felled wood is used as a cooking salt (Tchoundjeu & Atangana, 2006). In the south-west region of Ivory Coast, the leaves are used in traditional medicine for the treatment of dysentery and female sterility (Boko-Haya et al., 2017). Kernels are used directly in food and also used as a flavor enhancer, a thickening agent for soups (Tchiégang et al., 1997) and to make “akpi sauce”. The paste made from the kernel is also used as a remedy for toothache in Cameroon (Agbor &, Naidoo, 2015). Surveys in parts of Ivory Coast have shown that the hulls are used to produce energy by combustion in traditional domestic stoves, or as a composite construction material, to form a hard drainage layer (Nikiema et al., 2019).

No study has yet reported the industrial-scale use of R. heudelotii anywhere in the world.

1.2 Quality and uses of Ricinodendron heudelotii oil

The kernels extracted from the seeds contain 21% protein and 47.4% oil (Nikiema et al., 2019; Coulibaly et al., 2018; Saki et al., 2005). The amino-acid composition of the R. heudelotii proteins in the cake obtained from seeds is satisfactory for human nutritional needs (FAO, 1973). A study in Ivory Coast (Nikiema et al., 2019; Nikiema et al., 2022) showed that R. heudelotii seeds contain an oil rich in polyunsaturated fatty acids (95%), making it one of the few drying polyunsaturated vegetable oils. It contains on average 60% conjugated linolenic acid (CLnA), particularly in the form of α-eleostearic acid in the lipid fraction, which makes it one of the rare drying polyunsaturated vegetable oils and also constitutes a potential benefit for health. It is characterized by a high iodine value (180 g I2/ 100 g). It contains a mean of 60% conjugated linolenic acid (CLnA), particularly in the form of α-eleostearic acid in the lipid fraction. The minor constituents, including tocopherols (135 mg/100 g oil) and sterols (412 mg/100 g oil) are preserved during the extraction. This and the presence of high levels of dietary fibre render R. heudelotii seeds a very good candidate for use in food for human consumption.

The stacked histogram in Figure 1 summarizes the fatty-acid compositions of the oils most widely used in Africa, comparing them to that of native R. heudelotii kernel oil (Nikiema et al., 2019; Lecerf, 2017; Noba et al., 2014; Pages, 2009; Raynal-Ljutovac et al., 2011). This comparison between oils (palm and peanut) and butters (shea, cocoa) produced in Africa shows that R. heudelotii oil is the only source of CLnA among these products.

thumbnail Fig. 1

Fatty-acid profiles of the main oils and butters produced and used in Africa.

2 Focus on Ricinodendron heudelotii in Ivory Coast

Ricinodendron heudelotii fruit is harvested almost exclusively from trees already in cultivation (in cocoa and coffee plantations) and in accessible areas (Herzog, 1994). The fruits are harvested directly from the ground after they fall, due to the great height of the trees. This is a long and difficult process, due to the surrounding vegetation, as these trees often grow in areas left to fallow. Our survey showed that the density of R. heudelotii plants in the field, particularly in cocoa and coffee plantations, rarely exceeds two plants per 5 hectares. This density appears much too low to support sufficiently high levels of production for the structuring of large-scale use.

Nikiema (2021) studied the location of R. heudelotii trees in 23 localities of the center and south of Ivory Coast (Fig. 2), namely: Abidjan, Yamoussoukro, Sinfra, Gagnoa, Tiassalé, Toumodi, Oumé, Divo, Danané, Man, Lakota, San Pedro, Soubré, Adiaké, Adzopé, Kotobi, Bouaké, Arrah, Akoupé, Daloa, Sikensi, Agboville, Rubino. In order to obtain as much information as possible, 3 villages were chosen per locality in order to collect information on the presence and production of R. heudelotii almonds regions. This plant was present at all the sites surveyed during 5 harvest periods, from 2016 to 2020. The South-East and the South-West are the two major production areas. The harvesting of its seeds and kernel production are strongly linked to the dietary habits of the local population: 82.5% of the sites surveyed produced R. heudelotii kernels, whereas 17.5% had no harvesting and processing activities. In Ivory Coast, the annual harvest of R. heudelotii (akpi) seeds amounts to about 100 tonnes of almonds.

thumbnail Fig. 2

Result of the census of wild Ricinodendron heudelotii trees in the survey areas visited in Ivory Coast.

2.1 Commercial outlets for Ricinodendron heudelotii

Ricinodendron heudelotii sector has a poorly developed artisanal structure in Ivory Coast. Trees of this species are irregularly distributed over the country, at low density, and little is known about seed production, which is irregular. Moreover, the overall data are incomplete: kernel production levels are unknown, the quality and traceability of kernels are variable, consumption rates are not recorded, for either the kernels or kernel oil, and the market prices of kernels and oil are very variable. Efforts are being made to tailor production to demand, but kernel production remains local and artisanal. Ricinodendron heudelotii trees used are wild. However, efforts are regularly made to increase awareness of the nutritional and market value of R. heudelotii products among the populations of the areas of production, such as the Gulf of Guinea and the Congo Basin (Roques et al., 2019). As a result of these actions, R. heudelotii kernels are becoming increasingly common in markets and demand from the population seems to be growing.

There is an incipient local industry based around this tree in Ivory Coast: the fruits of R. heudelotii are harvested in the village by women. The kernels are then separated out from the rest of the seed by hand before being sold at the various markets. In 2018, the kernels sold at markets in the production areas had an at-the-edge-of-field price of 3,000 to 4,000 CFA francs per kg (i.e., 4.5 Euros per kg), whereas those transported to the major cities reached higher prices, ranging from 8,000 to 10,000 CFA francs per kg at the height of the season, and up to 15,000 CFA francs at the end of the harvest period (Nikiema, 2021). Prices vary with supply and demand, and locally according to kernel quality (dryness and shape).

Kernel production and sale has increased the income of producers, and it also contributes to the income of traders further afield, in the large towns.

Commercially, the current mode of production, artisanal and uncoordinated, can only lead to limited development of national markets and large-volume exports. Indeed, the kernels are sold almost exclusively in small amounts (Fig. 3). The market for the kernels is almost exclusively local and a little national and the quantities of kernels available for export are very limited (through the diaspora). The development of more efficient harvesting methods and structures or cooperatives should make it possible to increase the amounts recovered, facilitating the development of structured and industrially viable exploitation.

There is an embryonic market for the export of R. heudelotii kernels to some European countries, such as France, Belgium and Germany (Tabuna, 2000), mostly for consumption by expatriots from the countries that produce these almonds, who know how to use them.

thumbnail Fig. 3

Ricinodendron heudelotii kernels on a market in Abidjan, Adjamé, “marché Gouro”, packed in bags known as “Boite-Kilo”.

2.2 Ricinodendron heudelotii kernel production

The harmonious development of this new crop is subject to several constraints, mostly related to the harvesting, production and crushing of the kernels.

The technique used for seed hulling is archaic and very difficult to perform (Tchiégang et al., 2005; Nikiema et al., 2019), partly accounting for the scarcity and high price of R. heudelotii kernels both local markets and the markets of large towns. This method results in the production of only small quantities of kernels, destined almost exclusively for dietary consumption. A more efficient manual or automatic mechanical crushing system would make it easier to crush the hull and to separate it from the kernel. The artisanal technique of seed processing currently in use may also lead to a deterioration of kernel oil quality, due to contact with boiling water (Nikiema et al., 2019).

2.3 Structuring of the development of the Ricinodendron heudelotii sector

There is already a market for R. heudelotii in Ivory Coast, and its structuring is of particular importance for the development of agroforestry in the country. The objective is to provide all stakeholders with the opportunity to generate added value, through a progressive vision, in the short, medium and long term.

This will involve farmers, traders and the state creating structures for the organization of a crop value chain, and the development of appropriate legislation. Furthermore, researchers will need to develop new ways of adding value to products and co-products. The dissemination of knowledge to the population, and the commitment of producers and of companies needing oils rich in polyunsaturated fatty acids and proteins, will underlie the structuring of this crop value chain. The agricultural sector in Ivory Coast is the principal source of income for two thirds of households, employing almost 46% of the active population, accounting for 22.4% of GDP (Gross Domestic Product) in 2014 and more than 60% to export earnings (Note de stratégie pays, 2017). The CNRA (Centre National de Recherche Agronomique de Côte d’Ivoire) and ANADER (Agence Nationale d’Appui au Développement Rural) could serve as the preferred state actors for the development of this sector. This structuring of the development of the R. heudelotii sector should lead to the establishment of this tree as a new cash crop, favoring development in rural populations, in which the economy is based largely on subsistence activities (cash and food crops).

Additionally, the pivotal timeframe for harvesting, processing, and selling R. heudelotii seeds spans from June to November. This period holds great significance for the communities of producers as the income generated aligns with the commencement of the academic year in Ivory Coast, emphasizing the interconnection between generated income and the resumption of academic activities. The processing of R. heudelotii seeds remains an artisanal activity performed by women. Improving this activity and others relating to R. heudelotii could therefore make an important contribution to the emancipation of women and the creation of women’s cooperatives in rural areas. A key factor in this development will be the construction of expertise about the products and the transformation processes, with targeting and optimization of the parameters likely to influence product quality. This will be essential to increase production, storage and marketing capacities at the national and international levels.

2.4 Recommendations for the development of a Ricinodendron heudelotii value chain

Our work shows that the structural organization of R. heudelotii cultivation is still at an early stage, and that its development is currently based on the natural availability of wild trees, attempts to domesticate R. heudelotii and an embryonic market. Many actions are required to improve the development of this sector. Our recommendations are listed in Table 1, with possible levels of intervention, expected results, recommendations for achieving results and the support structures potentially required for the implementation of the necessary actions.

Table 1

Recommendations for the development of the Ricinodendron heudelotii sector in Ivory Coast.

3 Conclusion

The production of kernels and oil from R. heudelotii in Ivory Coast has been developing in recent years, to meet the growing needs of the local population in terms of lipids and proteins, and for the development of new markets for these products locally and globally. Ivory Coast, has testing the use of R. heudelotii plants in agroforestry and in experimental fields, with the principal objective of increasing production. R. heudelotii kernel production in Ivory Coast is currently limited in terms of quantity, due to its artisanal nature, in an informal crop value chain operated at a local level by women. This production appears to contribute to household income and provides significant potential business opportunities highlighting the extent to which the potential of this tree as a cash crop is far from well exploited. This lack of optimization is linked to the difficulties involved in organizing the R. heudelotii value chain, from cultivation to kernel production, the traditional system of production and an uncontrolled market. However, the cultivation of R. heudelotii in agroforestry is likely to be the key to developing economic growth and restructuring plant cover. The development of outlets for the kernels, oil and proteins of R. heudelotii, the improvement and control of product quality, and the modernization of seed crushing and oil extraction methods are essential conditions for increasing production and for the structuring and expansion of the market, which will be a key element in the economic development of Ivory Coast.

Conflicts of interest

The authors declare that they have no conflicts of interest in relation to this article.

Author contribution statement

Conceptualization: Z.M., RV.; Supervision: Z.M. K.O.K., A.A., C.R.; Validation: M.C., O.M. J.F.F., E.L.; Writing—original draft preparation: D.N., R.V., Writing − Review & Editing: R.V.; Resources: S.B. All authors have read and agreed to the published version of the manuscript.

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Cite this article as: Nikiema D, Mouloungui Z, Oi Koua K, Sandjon B, Raynaud C, Cerny M, Fabre J-F, Merah O, Lacroux É, Adjou A, Valentin R. 2024. Overview of the establishment and uses of Ricinodendron heudelotii (Euphorbiaceae): focus on the central and southern regions of Ivory Coast. OCL 31:12.

All Tables

Table 1

Recommendations for the development of the Ricinodendron heudelotii sector in Ivory Coast.

All Figures

thumbnail Fig. 1

Fatty-acid profiles of the main oils and butters produced and used in Africa.

In the text
thumbnail Fig. 2

Result of the census of wild Ricinodendron heudelotii trees in the survey areas visited in Ivory Coast.

In the text
thumbnail Fig. 3

Ricinodendron heudelotii kernels on a market in Abidjan, Adjamé, “marché Gouro”, packed in bags known as “Boite-Kilo”.

In the text

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