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. 2024 Apr 2;11:1354. Originally published 2022 Nov 21. [Version 2] doi: 10.12688/f1000research.124596.2

Cashew apple in Tanzania: status of utilization, challenges, and opportunities for sustainable development

Noel Dimoso 1,a, Neema Kassim 1, Edna Makule 1
PMCID: PMC11445638  PMID: 39359309

Version Changes

Revised. Amendments from Version 1

The new version provides more examples of cashew apple processing startups in Africa, particularly in west Africa. Also, two new sections were added: one that explains some technical challenges in cashew apple processing and another that explains future perspectives on cashew apple processing. Lastly, a more detailed explanation of actionable recommendations along with suggested actors to implement those recommendations is provided in this version.

Abstract

Cashew apples, although widely available and rich in nutrients are still underutilized after harvest in Tanzania. Approximately 2,327,000 metric tonnes of cashew apples are lost each year. Their counterpart, the cashew nut is highly appreciated and successfully contributes to the national economy. The huge underutilization of cashew apples is a challenge that requires urgent attention in order to achieve both national and global Sustainable Development Goals (SDGs) by 2030. Improvement of the cashew apple sector could have a positive impact on global SDGs 1, 2, and 3 targets of no poverty, zero hunger, and good health and well-being respectively. At national level, this sector could contribute to the goals of the Tanzania Development Vision (TDV) 2025, namely: high quality livelihood, particularly food self-sufficiency and food security; and a strong and competitive economy, particularly a diversified and semi-industrialized economy with a substantial industrial sector comparable to typical middle-income countries. In addition, the country’s Third Five Year Development Plan III (FYDP III) 2021/22 – 2025/26 has established key strategic interventions, notably those related to competitive industrialization, energy, and food and nutrition security to ultimately achieve the goals of the TDV 2025. To be effective, however, these strategic interventions require continued strong central and local government support and active involvement of stakeholders to ensure program effectiveness yielded towards efficient utilization of widely available natural resources such as cashew apples which has cross-cutting benefits in food, agriculture, health, energy, and economic perspectives. Therefore, the work provides evidence on the utilization status, challenges, and opportunities for sustainable development in Tanzania.

Keywords: cashew apples, utilization status, sustainable development, Tanzania

Introduction

The cashew sector is of great importance to the economy of Tanzania. As of 2015, the sector contributed around 497 billion Tanzanian Shillings, courtesy of cashew nuts ( Msoka et al., 2017). However, the cashew tree bears both the cashew nut and cashew apple ( Figure 1), and thus the latter is left to rot in the fields and less likely to be processed or fed to livestock. For instance, the estimated production of cashew apples in the country is about 2,327,000 metric tonnes, and yet there’s no significant commercial processing of this fruit ( Dimoso et al., 2021). Unexpectedly, utilization of this fruit has been for decades hampered by several factors: high perishability and astringent nature of the fruits; inadequate public knowledge and awareness of their potential for food and nutrition security and socio-economic development; inadequate skills and technologies for value addition; and weak investment and collaboration among stakeholders ( Dimoso et al., 2021). This fruit contains several important ingredients including vitamins (A and C), sugars, minerals, polyphenols and dietary fibers ( Msoka et al., 2017), hence it is suitable for processing of value-added products in food, bio-energy, pharmaceutical, and biochemical processing industries.

Figure 1. Hanging cashew nuts and cashew apples on a tree (Source: Authors).

Figure 1.

The huge underutilization of cashew apples is a challenge that requires urgent attention in order to achieve both national and global Sustainable Development Goals (SDGs) by 2030. Considering the country’s huge production of cashew apples as raw materials in different industrial sectors, adequate utilization of these fruits could have a positive impact on global SDGs 1, 2, and 3 targets of no poverty, zero hunger, and good health and well-being respectively ( United Nations, 2015). At national level, the cashew apple sector could contribute to the achievement of goals of the Tanzania Development Vision (TDV) 2025 namely: high quality livelihood, particularly food self-sufficiency and food security; and a strong and competitive economy, particularly a diversified and semi-industrialized economy with a substantial industrial sector comparable to typical middle-income countries. In addition, the country’s Third Five Year Development Plan (FYDP III) 2021/22 – 2025/26 has established key strategic interventions, notably those related to competitive industrialization, energy, and food and nutrition security to ultimately achieve goals of the TDV 2025 ( United Republic of Tanzania [URT], 2021). Similarly, the National Post-Harvest Management Strategy (NPHMS) 2019-2029 addressed strategic objectives aimed at reducing postharvest losses of agricultural crops with an ultimate goal of increasing stakeholders’ income and food and nutrition security ( URT, 2019). To be effective, however, these strategic interventions require continued strong central and local government support and active involvement of stakeholders to ensure program effectiveness yielded towards efficient utilization of widely available natural resources such as cashew apples which has cross-cutting benefits in food, agriculture, health, energy, and economic perspectives. Therefore, this policy brief provides local and international evidence regarding the quality of cashew apples (based on the study by Msoka et al., 2017), the utilization status and challenges (based on the study by Dimoso et al., 2021), product development interventions (based on the study by Dimoso et al., 2020) and addresses the need for strong policy and programmes in order to harness the full potential of cashew apples for sustainable development in Tanzania.

Policy outcomes and implications

Benefits of cashew apples

There are several feasible usages of the cashew apple ( Table 1), which if sufficiently exploited could help in part achieve the goals of the FYDP III and TDV 2025. For instance, in the arena of food and nutrition security, the FYDP III looks to reduce the prevalence of vitamin A deficiency among children aged 6-59 months to less than 20 percent, the proportion of women aged 15-49 years with anaemia from 44 to 22 percent, and reduction of acute malnutrition by year 2025, among others ( URT, 2021). The same micronutrient challenges were addressed by the Tanzania Demographic Health Survey 2010 ( URT, 2011). Increasing public awareness on the health benefits of cashew apple could increase their consumption (raw or processed form) and hence reduce a prevailing health burden. With regard to industrialization, the FYDP III emphasizes on value addition in agriculture through the use of science, technology and innovation as well as research and development ( URT, 2021). Since huge postharvest losses impact nutrition (especially on micronutrient deficiencies), the NPHMS outlines strategic interventions including facilitation of awareness on postharvest management, value addition, and improving agricultural marketing infrastructure to reduce losses particularly on perishable crops such as fruits and vegetables ( URT, 2019). For these reasons, cashew apple provides a diversified quality of products for domestic and export market, and hence stimulates socio-economic development.

Table 1. Multiple potential utilization of cashew apples.

Raw material Potential sectors Potential products References
Cashew apples Food Fresh fruits Paiva, 2012
Fresh beverages (Juice, Syrup, Squash, Soda, Nectar) Talasila et al., 2012
Alcoholic beverages (Wine, Distilled liquor) Gamero et al., 2019
Probiotic beverages Kaprasob et al., 2018
Culinary products (Vinegar, Pickles, Preserve, Jam) Silva et al., 2007
Confectionary products (Candy, Biscuit) Dimoso et al., 2020
Cashew apple fibers/powder (added in soup, snack bars, cake) Adegunwa et al., 2020
Natural food additive (Color) Paiva, 2012
Energy Bioethanol Talasila and Vechalapu, 2015; Teles et al., 2017
Microbial fuel cell (low voltage electricity) Priya and Setty, 2019
Biochemical processing Lactic acid, Oxalic acid, Dextran, Mannitol, Oligosaccharides, Bio-surfactant Nogueira et al., 2019; Betiku et al., 2016
Agriculture Animal feed Mathew et al., 2013
Pharmaceutical Nutraceuticals (Vitamin C, Polyphenols, Dietary fibers) Ribeiro da Silva et al., 2014

Equally important, according to Country Development Cooperation Strategy October 19, 2020 – October 19, 2025 ( USAID/Tanzania, 2023), there is an increasing unemployment burden in Tanzania, particularly among young people in rural areas. In addition, a large segment (75 percent) of Tanzania’s workforce population is under the age of 35 years. This young generation faces a great challenge to land employment immediately after finishing their qualifications as they lack sufficient basic and technical knowledge and soft skills needed to succeed in today’s competitive workforce ( USAID/Tanzania, 2023; Mgaiwa, 2021). Statistically, out of one million young people, less than 20 percent get employed immediately ( Mgaiwa, 2021). In line with the FYDP III and TDV 2025, an entrepreneurship approach is the feasible option to solve youths’ unemployment burden. Establishing and strengthening the Small and Medium Enterprises (SMEs) is critical due to the fact that, SMEs utilize locally available materials and have the potential to engage many people especially youth, women, and people with disabilities. There are many SMEs processing cashew nuts in cashew producing regions such as Mtwara, Lindi, Tanga, and Pwani, while not the same can be said about cashew apples. With the aforementioned benefits, cashew apple presents greater opportunities for researchers, politicians, investors and farmers to exploit its potentials, and ultimately drive forward national economy.

Quality and utilization of raw cashew apples in Tanzania

Based on a recent study by Msoka et al. (2017), Tanzania’s cashew apple varieties are of considerable good quality. The aforementioned study revealed a good quantity of valuable components such as vitamin C, carotenoid (provitamin A), sugars, polyphenols, dietary fibers, and minerals such as calcium, magnesium, sodium, potassium as well as low quantities of phosphorus, iron, and zinc. These ingredients make cashew apple a perfect raw material in food, energy, agriculture, pharmaceutical, and biochemical processing industries. From a health perspective, vitamin C, carotenoids, and polyphenols have antioxidant and anti-inflammatory activities, thus provide cashew apple an ability to reduce, prevent, or treat a number of chronic diseases such as scurvy, cancer, and neurodegenerative diseases. Since this fruit has a vitamin C content almost five times that of orange or mango, it can be used in food fortification and formulation. Furthermore, presence of sugars, dietary fibers, and minerals make cashew apple a perfect microbial substrate in different fermentation processes to produce value added products such as ethanol (as food drink or energy), organic acids, and bio-surfactant.

A field survey was conducted in major cashew producing regions i.e. Mtwara and Lindi to obtain insightful information regarding the utilization aspects of cashew apple ( Dimoso et al., 2021). The study revealed that the majority (98 percent) of cashew farmers consume raw cashew apples, with 62 percent consuming more than five fruits a day and about 56 percent consuming almost every day during the fruit season. However, farmers’ knowledge on the importance of eating cashew apple seemed limited. As a matter of fact, the majority of consumers (53 percent) claimed to eat cashew apple just because it is a fruit. In addition, few respondents seemed to acknowledge the contribution of fruits such as cashew apple to human health. Moreover, nearly 44 percent of farmers traditionally process cashew apple into porridge (traditionally called Mkongohu) and alcoholic drinks namely wine (traditionally called Uraka) and distilled liquor (traditionally called Nipa). With respect to challenges, lack of knowledge on postharvest handling (86 percent), and inadequate processing technologies (83 percent), among others were mostly claimed to hamper the utilization.

Current modern processing and opportunities of cashew apple in Tanzania

Recently, Nelson Mandela African Institution of Science and Technology (NM-AIST) has formulated dried fruit slices and juice products from cashew apple ( Dimoso et al., 2020). The formulated cashew apple products were deemed acceptable with respect to nutrient retention, shelf-life stability and sensory properties. Similarly, Tanzania Agricultural Research Institute (TARI) - Naliendele and Ndanda Mission have also been developing cashew apple juice, jam and wine ( UNIDO, 2011). However, a commercialization stage of the aforementioned prototypes is yet to be attained.

It is apparent that, while few food products have been already developed, other value-added products for sectors such as bio-chemical, energy, and pharmaceutical industries remain unexplored. The current situation provides an opportunity for stakeholders to venture in cashew apple value chain. Therefore, the initiatives for product development and commercialization of cashew apple value-added products need to be formulated and implemented. This will foster the sustainable existence of cashew apple products in the market.

Value addition through agro-processing of highly perishable crops such as fruits and vegetables should be emphasized. According to the Ministry of Industry and Trade survey 2013, there were only 17 fruit processing units in a country, of which none is for cashew apples ( URT, 2019). Shortage of fruit processing industries account largely for the reported huge postharvest losses of such commodity. In this regard, the NPHMS has the following strategic objectives, among others that could benefit the cashew apple value chain: (1) promote availability, accessibility, affordability and adoption of tested technologies and processes to reduce post-harvest losses; (2) promote research and innovations of new and appropriate technologies and methods to reduce crop losses; (3) facilitate agricultural marketing systems to improve market access and minimize post-harvest losses. Likewise, value addition, food fortification and formulation, technology development and transfer, and commercialization of local agro-products are among the top research priorities outlined by the National Research Priorities 2021/22-2025/26 ( URT, 2022) to facilitate human capital development and building of strong and competitive industrial economy.

International evidence on cashew apple processing

The most successful country in cashew apple processing is Brazil. This country has about 12 different cashew apple juice processing industries alone, while others sell fresh fruits, dried fruits, jam, wine, confectionaries, and animal feeds. Equally important, the Brazilian Agricultural Promotion Agency (EMBRAPA) is the leading actor in cashew apple value chain. For instance, it developed a cashew apple variety that can remain on the ground for 1 day without being damaged or beginning to ferment. On the contrary, Tanzanian varieties are very soft and get damaged once they fall on the ground, hence they require immediate processing and/or a cold chain facility for distant transportation or long-term storage. In addition, limited access to a sustainable cold chain for perishable crops (fruits and vegetables) is a dominant challenge not only in Tanzania but the whole region of Sub-Saharan Africa ( Makule et al., 2022). India has also progressed in developing cashew apple products, however, their commercialization is still a challenge.

However, in West African countries such as Ghana, Benin, Senegal, Nigeria, and Guinea-Bissau, there is little effort regarding cashew apple usage ( Monteiro et al., 2017), in spite of a large number of research publications and several stakeholders’ training sessions on cashew apple valorization. For instance, Benin and Ghana have started producing and marketing cashew apple juice, such as the brand Sweet Benin juice, through the BeninCaju project, although the sector is still in its infancy ( TechnoServe, 2017). Agbara-Oluwa Cooperative is a fruit processing company that recently began to produce cashew apple juice and sell it in Benin and nearby countries, including Niger, Burkina-Faso, and Togo ( USAID/Catholic Relief Services, 2023). In Senegal, a well-established fruit processing company known as Zena Exotic Fruit has started to commercially produce cashew apple juice, butter, and jam, which are sold at the physical and online markets ( Zena Exotic Fruits, 2024). Likewise, along with other fruits in Senegal, a Casadeliz company produces and sells cashew apple juice ( Casadeliz, 2021). According to Yantannou (2017), no country in Africa is processing more than 1% of its cashew apple production. Despite the fact that Africa is home to very few small-scale enterprises, their important role as forerunners in the commercial processing of cashew apples deserves recognition. With the available publications and ongoing research, it is feasible to upscale the processing in order to efficiently and effectively benefit from the untapped health and economic potential of cashew apples. Therefore, there are greater business opportunities in the cashew apple value chain in African cashew-producing countries.

Technical challenges in cashew apple processing

Unlike other tropical fruits in Tanzania, such as avocado, mango, pineapple, passion, and orange, cashew apples present several underlying constraints that limit their wider utilization on both an individual and industrial scale. Firstly, its astringent nature due to tannins provides an unpleasant taste in extracted juice. The presence of tannins increases the turbidity of the juice, hence the unpleasant appearance of the formulated products. Thus, several studies are dedicated to applying different techniques to reduce tannin concentration or its influence on final products by using clarifying agents ( Talasila et al., 2012; Aluko et al., 2023), tangential microfiltration ( Soro et al., 2017), blending with other fruit juices ( Adou et al., 2017), and the production of tannin-free products such as distilled ethanol and organic acids ( Betiku et al., 2016). Also, the level of tannins often varies with respect to cashew variety and geographical location. Hence, each country or processing entity should find a standardized formulation to reduce tannin concentrations depending on their location or the cashew variety used in their processing.

Another challenge relates to its high perishability due to the thin and soft outer skin of the cashew apple. This property affects its harvesting, transportation, and storage as it makes the fruit more susceptible to physical damage or bruises, high temperatures, and insects or microbial infestations. Cashew apples should not fall to the ground when being harvested, hence specialized harvesting hooks are frequently employed to gather the fruits from the tree.. It is noteworthy that the Brazilian agency EMBRAPA has developed a variety that can fall and remain on the ground without being damaged for more than a day. Unfortunately, this type of variety is not present in Tanzania or other African cashew-producing countries. Other studies suggested the use of cold storage ( Makule et al., 2022) and chemical pretreatment by using sodium chloride, calcium chloride, and potassium metabisulphite solutions ( Ghag et al., 2024) to extend the shelf life of cashew apples. However, more widely applicable, reasonably priced techniques are required. If not, primary processing facilities ought to be set up close to the cashew orchards.

Although cashew apple skin colors range from yellow to red, its juice after extraction is not as colorful as the skin due to the fact that most pigmented compounds, such as carotenoids and polyphenols, are present on the fruit skin. However, after thermal processing, the color of a juice ranges from yellow to brown, depending on the processing temperature and time. This is due to the fruit-reducing sugars, which undergo the Maillard reaction, thus affecting the flavor and color of the product. Also, other heat-sensitive bioactive compounds, such as vitamin C and polyphenols, are reduced during thermal processing. Therefore, temperature control is a critical parameter in cashew apple processing in order to produce an acceptable, nutritious product.

Future perspectives on cashew apple processing

In Tanzania, as in many African countries, the agriculture sector is the foundation of the economy. The cashew subsector has already proved its huge contribution to the economy among the agricultural products in the country. Its counterpart, the cashew apple subsector, also offers huge economic potential for its utilization to produce value-added products in the food, biochemical, energy, and feed industries ( Table 1), among others. Although there are several research publications on cashew apple processing worldwide, the establishment of processing factories in many African countries remains a challenge. Inherent cashew apple properties, such as its astringent taste and high perishability nature, are the most limiting factors in its valorization; thereby, further innovative research will need more attention on this topic. Considering its abundance, cashew apple offers an inexpensive biomaterial for integrated upstream and downstream processes based on many products. For instance, cashew apple by-products after juice production by the food industry can be used by the feed, biochemical, and energy industries to produce animal feeds, oligosaccharides, and bioethanol, respectively, among others. And by-products from later industries can be used to produce fertilizer, which is applied to cashew plantations. This approach is viable if bioprocesses and engineering techniques are successfully combined. To create sustainable processes that can promote economic growth, engineering parameters should be studied in conjunction with process integration and scale-up, as well as research on life-cycle analysis and system analysis. Furthermore, the non-climacteric nature and seasonal availability of cashew apples should be taken into account for overall industrial production and processing.

Actionable recommendations

Research and extension. For farmers, the public extension service is typically the first point of contact. The extension service focuses mainly on pest control, tree replacement and rehabilitation, and post-harvest care. However, cashew research and extension services in Tanzania are primarily intended for cashew nuts only, while attention to cashew apples is almost nonexistent, hence the observed significant underutilization of these potential fruits ( Dimoso et al., 2021). Cashew apple research and extension is a critical element for the success of the whole CAVC. Cashew research and extension are fully integrated into the Tanzania Agricultural Research Institute, Naliendele (TARI-Naliendele). This center has a mandate to conduct, regulate, promote, and coordinate all agricultural research activities conducted by all research institutes. Unlike cashew nuts, cashew apple research activities under TARI-Naliendele and academic institutes or universities are minimal at present. These actors, along with others, can facilitate research, training, and capacity-building activities related to cashew apples for farmers, extension personnel, policymakers, graduates, and consumers. For instance, cashew apple research can focus on developing the best variety that is nutritious, sweet, and juicy with firm skin to resist damage and also develop innovative cold storage to extend shelf life and processing technologies for value addition. Further, through dissemination programs, the public awareness of the healthy and economic importance of cashew apples can be raised. A key example is the EMBRAPA and universities, which are significantly contributing to the valuation of cashew apples through research and innovation in Brazil.

Farmer associations. Theoretically, farmer associations (FA) can help with information exchange and strengthen bargaining leverage with crop buyers and input suppliers. It is also a reliable way to obtain funding support from government and non-government organizations (NGOs). Equally important, youth and women are more likely to participate in FA than act individually. Further, sustainable production, microprocessing, and marketing of cashew apples can be established through FA. Regarding cashew nuts, there are several small and medium enterprises (SMEs) that produce, process, and sell processed cashew nuts in the domestic market. Also, the transnational company OLAM has invested in first-stage processing close to farmers and supported farmers in enhancing the products’ quality through contract farming, thereby enhancing the reliability of its cashew nut supply chain in Tanzania ( CABRI, 2019). Since cashew nut and cashew apple are products of the same plant, they could also be incorporated into their business programs. Among other implementation strategies, the willingness of farmers to engage in FA and the government and NGOs provision of funds and better marketing infrastructure could ensure the sustainability of FA, hence the increased utilization of cashew apples in the country.

Rural infrastructure. Although rural infrastructures such as roads, irrigation, and market structures are long-term investments, their improvement is vital to all rural value chains. In Tanzania, cashew-growing regions such as Lindi, Mtwara, and Pwani have poor rural roads, especially those connecting cashew orchards. In most cases, this role is carried out by the national government with or without the help of international agencies. Given the high perishability of cashew apples, better rural roads could facilitate rapid transport of fruits and related products to and from major producing, processing, and marketing locations.

Financial services. The majority of Tanzania’s cashew crop is produced by impoverished smallholder farmers (SHFs) ( Dimoso et al., 2021). The case is similar in Africa, where nearly two million SHFs participate in cashew production, and about 75% of them are poor ( Collaborative Africa Budget Reform Initiative [CABRI], 2019). Therefore, reinforcing access to affordable financial resources for all actors in the cashew apple value chain (CAVC), particularly SHFs and microprocessors could transform the cashew apple industry into a profitable venture. The national government and financial institutions are key actors in this arena. For instance, instead of being a direct financial provider, the government can establish and enable a conducive environment for private actors to provide financial services to CAVC. Through microfinance institutions, poor farmers and processors could get credit, savings, and insurance services needed to improve the cashew apple business. Further, the government should establish regulatory frameworks to govern microfinance institutions through mutual and sustainable transactions between clients and institutions. On the other hand, private actors such as USAID, Irish Aid, UNIDO, the International Labor Organization (ILO), and the African Development Bank (AfDB) have occassionally provided funds to support Tanzania’s agricultural sector. Further financial support in the cashew apple subsector could have a significant impact on the production, processing, and marketing of cashew apples in the country. Nevertheless, better agricultural technologies, extension services, and established local markets that are well integrated with the broader economy are necessary for impoverished farmers to use financial services to generate profits and carve out new market niches.

Processing and marketing. Investing in the value addition of agricultural produce is a feasible action for the success of any value chain. Brazil, as an example, has a number of value-added and consumer-acceptable cashew apple products such as fresh fruits, juice, alcoholic drinks, and food colors. Given the quantity of cashew apples in Tanzania, the same might be done there. Implementation strategies could be taken by research institutions and universities to develop better cashew apple breeds, value-added products, and other solutions to prolong their shelf-life. Meanwhile, the government can create a supportive environment for partnerships and collaborations with private actors to provide funds for projects related to value addition. Also, the National Post-Harvest Management Strategy 2019-2029 ( URT, 2019) already put forward strategies to reduce post-harvest losses of crops, among them being value addition. Therefore, it is necessary to put those strategies into practice. Moreover, the government should ensure a fair competition between individuals, SMEs, and fully established food industries in Tanzania. Government and NGOs, through extension personnel, could launch campaigns aiming to increase public awareness and engagement in CAVC. Further, the realization of efficient utilization can be preceded by conducting market analysis, gaining an understanding of consumer preferences, and strengthening the linkage between farmers, processors, and consumers.

Conclusions

Addressing the wastage of cashew apples in Tanzania and the underlying opportunities is necessary in order to realize the goals of the FYDP III and TDV 2025. Among other factors, astringency and high perishability characteristics, inadequate processing skills and technology, and limited access to capital have contributed to the underutilization of these fruits. Being rich in vitamins, minerals, and bioactive components, cashew apples could be processed into a number value-added products. Increasing public awareness on the importance of cashew apples as a source of food and income could accelerate their utilization. Additionally, all stakeholders including individuals, agricultural research institutions and universities, and other public and private sectors are encouraged to participate in this endeavour to facilitate research, technology transfer and development, capacity building, and improve agricultural marketing infrastructure in order to utilize cashew apples effectively and efficiently and ultimately increase food and nutrition security and socio-economic development. Furthermore, all established national policies, strategies and programmes should be supported to implement the underlying objectives in relation to the cashew apple value chain.

Data availability

Underlying data

The raw data for the survey conducted by Dimoso et al. (2021) is restricted. Only members of the Fruits and Vegetables for all Season (FruVaSe) project can access the data directly. However, data can be accessed upon request by non-members. Please consult Dr Edna Makule via email ( edna.makule@nm-aist.ac.tz) to obtain the data file.

These data are under open access and can be accessed at their respective links/DOI.

Author contributions

Dimoso N: Conceptualization, Methodology, Investigation, Writing – Original Draft Preparation, Writing – Review & Editing; Kassim N: Supervision, Conceptualization, Writing – Review & Editing; Makule E: Supervision, Conceptualization, Funding Acquisition, Project Administration, Writing – Review & Editing.

Funding Statement

Grant information: This policy brief was supported by funds of the Federal Ministry of Food and Agriculture (BMEL) based on a decision of the Parliament of the Federal Republic of Germany via the Federal Office for Agriculture and Food (BLE) with grant notice to University of Göttingen (UGOE) of December 5th 2017 for Fruits and Vegetables for all Season (FruVaSe) project, grant number 2816PROCO04.

The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

[version 2; peer review: 1 approved

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F1000Res. 2024 Oct 1. doi: 10.5256/f1000research.164130.r325040

Reviewer response for version 2

Yusuf Momohjimoh 1

The policy brief potentially reflects the utilization and challenges faced with cashew apple consumption, outlines the opportunity for sustainable development in Tanzania. The topic of discussion in this document is a significant one that contribute to the present-day research knowledge and aligned with current research trend. The paper being more of a narrative review employing case studies, did not report method of data collection from which inferences (results) are drawn. In most cases where data from research journal publications, case studies, newspapers, bureau of statistics, conferences, government bulletins amongst other are utilized, authors should specify appropriately. All sections have been appropriately stated. However typographical errors should be effected as corrected in the body of the work. Certain questions have been raised in the comment box in the body of the work (affected parts highlighted in yellow color), authors should look into them appropriately. Abstract section however requires major revision as it only talks about the under-utilization of cashew apple in Tanzania while highlighting the need for higher utilization to commensurate with the Tanzania Development Vision (TDV) 2025. Authors should revise the Abstract section to reflect the research topic while highlighting and/or summarizing the objectives of the paper, the methodology used, result obtained and conclusion/recommendation. Introduction section is well presented and substantiated with sufficient literatures. However, “Future perspectives on cashew apple processing” should be substantiated with sufficient literatures.

Does the paper provide a comprehensive overview of the policy and the context of its implementation in a way which is accessible to a general reader?

Yes

Is the discussion on the implications clearly and accurately presented and does it cite the current literature?

Yes

Are the recommendations made clear, balanced, and justified on the basis of the presented arguments?

Yes

Reviewer Expertise:

Agronomy, soil fertility, genetics and seed production, agricultural economics.

I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard, however I have significant reservations, as outlined above.

F1000Res. 2024 May 10. doi: 10.5256/f1000research.164130.r261901

Reviewer response for version 2

Sampson Kofi Kyei 1

I Accept the manuscript in its current form.

Thank you.

Does the paper provide a comprehensive overview of the policy and the context of its implementation in a way which is accessible to a general reader?

Yes

Is the discussion on the implications clearly and accurately presented and does it cite the current literature?

Partly

Are the recommendations made clear, balanced, and justified on the basis of the presented arguments?

Partly

Reviewer Expertise:

Waste and Biomass valorisation; Industrial Chemistry, Environmental Chemistry

I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard.

F1000Res. 2023 Oct 3. doi: 10.5256/f1000research.136803.r207201

Reviewer response for version 1

Sampson Kofi Kyei 1

I found manuscript entitled "Cashew apple in Tanzania: status of utilization, challenges, and opportunities for sustainable development"

very interesting. While going through the manuscript I found that manuscript is well-recognized to an extent and could be considered as a valuable contribution, but requires a minor revision. I would like to raise some comments, and recommendations about the manuscript:

  1. In-text referencing: Some sentences needs to be referenced e.g. Paragraph 2 (Page 4) has some sentences with facts that needs to be referenced accordingly.

  2. Paragraph 1 (Page 5) presents a review on a study by Msoka et al. (2017). Please, change the first word in sentence 2 "A"  to "The"

  3. On the "International Evidence of Processing of cashew apple", it must be noted that some African countries are doing well regarding its usage/applications; e.g., Nigeria. The authors must provide a paragraph on some of these countries and their contributions.

  4. Please add separate section dealing with various factor and challenges (technical) that can be faced during industrial scale processing/application of cashew apples/fruits.

  5. I suggest authors to write future perspectives on the cashew apple processing

  6. I should commend the authors on the "actionable recommendations". However, they failed to specify who/which organization or party is responsible for the implementation

Does the paper provide a comprehensive overview of the policy and the context of its implementation in a way which is accessible to a general reader?

Yes

Is the discussion on the implications clearly and accurately presented and does it cite the current literature?

Partly

Are the recommendations made clear, balanced, and justified on the basis of the presented arguments?

Partly

Reviewer Expertise:

Waste and Biomass valorisation; Industrial Chemistry, Environmental Chemistry

I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard, however I have significant reservations, as outlined above.

F1000Res. 2024 Mar 24.
Noel Dimoso 1

1. A suggested in-text reference is included in this version

2. A suggested correction was addressed in this version

3. On the "International Evidence of Processing of cashew apple" section, more cashew apple startups from different African countries were added in this version

4. A separate section dealing with various factor and challenges (technical) that can be faced during industrial scale processing/application of cashew apples/fruits is included in this version

5. A new section 'future perspectives on the cashew apple processing' is included in this version

6. A section 'Actionable recommendation' is re-written to address an organization or party that will implement those recommendations

F1000Res. 2023 Sep 26. doi: 10.5256/f1000research.136803.r203422

Reviewer response for version 1

Iheanyi William Eke 1

The paper reviews the current gaps in the cashew apple value chain in Tanzania and proposes some policy-based solutions to change the status quo for sustainable development.

Minor revision is recommended before publication:

  1. Some important references are missing. For example (i) Page 5 paragraph 2 "A study revealed a good quantity of...." (which study?)

    (ii) Page 4 "A large segment (75 percent) of Tanzania’s population is under the age of 35 years. This young generation faces a great challenge to land employment immediately after finishing their qualifications. Statistically, out of one million young people, only 20 percent get employed immediately" (reference?) etc.

  2. In the section "Actionable Recommendations", it will be useful to include the relevant action party (ies) in Tanzania to see to the implementation of these recommendations. Furthermore, the authors should proffer some practical steps/activities which these action parties could take/undertake towards the implementation of these recommendations. For instance, who is the action party in "encouraging and supporting youth and women to venture into the cashew apple value chain", and what are some of the steps this action party could take to achieve this. This same guideline should be applied to other recommendations. This will make them more actionable.

Does the paper provide a comprehensive overview of the policy and the context of its implementation in a way which is accessible to a general reader?

Partly

Is the discussion on the implications clearly and accurately presented and does it cite the current literature?

Yes

Are the recommendations made clear, balanced, and justified on the basis of the presented arguments?

Partly

Reviewer Expertise:

Biomass valorization

I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard, however I have significant reservations, as outlined above.

F1000Res. 2024 Mar 24.
Noel Dimoso 1

1. All important references were addressed in the new version as suggested

2. The section "Actionable Recommendations", is re-written in the new version to include the relevant action party (ies) in Tanzania to see to the implementation of these recommendations.

Associated Data

    This section collects any data citations, data availability statements, or supplementary materials included in this article.

    Data Availability Statement

    Underlying data

    The raw data for the survey conducted by Dimoso et al. (2021) is restricted. Only members of the Fruits and Vegetables for all Season (FruVaSe) project can access the data directly. However, data can be accessed upon request by non-members. Please consult Dr Edna Makule via email ( edna.makule@nm-aist.ac.tz) to obtain the data file.

    These data are under open access and can be accessed at their respective links/DOI.


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