Supply-SidePractices andConstraintsof theKolaNut (Colanitida (Vent) Schott. and Endl.) Value Chain in Ghana: A Descriptive Evidence

Social Science and Statistics Unit, Cocoa Research Institute of Ghana, P.O. Box 8, New-Tafo, Akyem, Eastern Region, Ghana Department of Geography and Resource Development, University of Ghana, Legon, Ghana Plant Breeding Division, Cocoa Research Institute of Ghana, P.O. Box 8, New-Tafo, Akyem, Eastern Region, Accra, Ghana Agronomy Division, Cocoa Research Institute of Ghana, P.O. Box 8, New-Tafo, Akyem, Eastern Region, Accra, Ghana


Introduction
Kola (a member of the family Sterculiaceae) is a tropical tree crop with over 140 species [1] of which 50 species have been described in West Africa by Adebola [2], cited in Dadzie et al. [3]. C. acuminate Schott and Eudl. and C. nitida Schott and Eudl. are the most common species, but the latter which originated from Ghana and Sierra Leone [4] has gained much preference and become the more important of the two kola species [5]. Over 90% of the world's kola nut is produced in West Africa of which Nigeria contributes 50%, Cameroon 27%, Ivory Coast 16%, and Ghana 8% FAO [6]. e kola nut is of enormous medicinal benefits and great sociocultural importance in many West African cultures. In Ghana, the nuts are popular among the Muslim populations in the northern sections of the country and some parts of the transitional zones in the Brong Ahafo region [7]. Ghanaians and other Africans predominantly use kola nut as a sign of friendship and peace and in cultural ceremonies, such as part of dowry in marriage ceremonies, child naming, installation of Chiefs, and funerals. e nut is also used as a masticatory stimulant [3,8,9]. e producer price of kola nut in Ghana increased steadily between the 1960s and 1990s, and this encouraged its cultivation by most farmers in the southern parts of the country leading to a dramatic increase in kola nut production [7]. About the same time, the government of Ghana greatly invested in promotional efforts to encourage kola nut production and marketing [7].
is increase in kola nut production prompted several agronomy and postharvest studies on kola nut by Brown and Afrifa [10]; Osei-Bonsu and Afrifa [11]; Osei-Bonsu et al. [12]; and Owusu-Manu and Bonku [13] to reduce field and postharvest losses to producers, processors, and exporters. Kola nut thus became one of three leading nontraditional agricultural export (NTAE) crops in Ghana including pineapples and yams [7]. However, in recent years, the volume of kola nut exports and its contribution to Ghana's total NTAE has dramatically dwindled [14] (Figure 1).
Resulting from an increase in the supply of the nuts in Ghana, the producer price for kola nut began to decline from about $1,700 tonne-1 in 1992 to about $600 tonne-1 in 2002 but started to rise in 2003 when production dwindled ( Figure 2) [6]. In 2011, Ghana's kola producer price was $2,300 tonne-1 (Figures 1 and 2) and this was more than twice that of Nigeria, the leading producer ($730 tonne-1) [6]. However, the share of the nuts in Ghana's NTAE had been below 0.01% as a result of low production [14]. However, there is an opportunity for Ghana to enhance its revenue from kola nut exports if production increases. e nut and its extracts have become popular in Europe and North America as a natural or alternative medicinal source and in the production of soft drinks, candies, beverages, animal feed formulation, liquid soap, and dyes [3,8,9]. In addition, according to Babatunde and Hamzat [15], the high nutritive quality of kola nut pod husk (as a byproduct) used for animal feed resulted in outstanding growth performance in broilers. e uses have inevitably created an increased global market demand in excess of its production [8,[16][17][18], which provides great prospects for the growth of the kola nut industry in Ghana.
Despite the history of the great contribution to the Ghanaian economy between the 1960s to the 1990s [7,19] and the potential economic benefits to the country, there is a dearth of information on the Ghanaian kola nut industry which can be the basis for its development. Even though a few research outcomes exist, the research gap is still huge. For instance, Dadzie et al. [3] recommended propagation techniques that result in the early bearing of the kola nuts. Also, Asamoah et al. [20] reported from a field survey that about 88% of chemicals that were used in the processing of kola nuts by farmers and processors were toxic to human health. Lowor [21] then investigated the storage and processing of kola nut to preserve quality while increasing its shelf life and recommended that kola nut could be sun-dried on wooden trays with raffia palm-based mat, milled, and stored in sealed bags over a period of twelve months without compromising the requirements for industrial processing. However, it is unknown if producers and processors are aware of these techniques.
Except for studies by Asamoah et al. [20] on practices of kola nut processors, no study has assessed the supply-side agronomic, and postharvest practices, as well as constraints in Ghana. Many studies describe kola nut supply-side agronomic practices and constraints of Nigeria but there is pausity of such studies in Ghana. is study fills this research gap for the Ghanaian supply-side with the aim of exploring and describing the current practices and constraints of farmers, processors, and marketers in the industry. is information is important for research to enhance the development of technologies adoptable by the farmers and processors [8]. It will also inform policymakers on the state of the Ghanaian kola nut industry and form the base for policy initiatives and interventions targeted at reviving the industry.

Sampling and Data
Collection. An initial survey which enabled rapid familiarity of the areas and communities involved in kola nut production, processing, and marketing in Ghana was conducted. Based on the survey, it was  2 International Journal of Agronomy projected that kola nut farmers could be identified in about 129 communities across the agroecological zones in Ghana. e conjectured total number of kola nut farmers and pickers from some chief farmers and key informants such as extension agents suggested that there could be about 800 kola farmers and 1,100 pickers with about 80% of farmers from the Eastern Region of Ghana.
Following the survey, a structured questionnaire was developed and pretested with kola nut farmers, processors, and traders at Oyoko in the Eastern Region of Ghana. e questionnaire was reviewed and modified based on feedback obtained from the pretesting. During the formal survey, the snowballing technique was used, since there was no list of the farmers, processors, and traders, to enhance a simple random sampling. Four hundred and six (406) smallholders, which included farmers, pickers, processors, brokers, and traders/marketers in eighty-four (84) communities within twenty-two (22)  Descriptive analyses, involving the use of frequencies, percentages, and plotting of geographical coordinates were employed to assess the distribution of kola nut farmers and pickers across the country. In addition, the production practices, constraints to production, production trends, and marketing structures and constraints were assessed descriptively.

Characteristics of Respondents.
e majority of the respondents across the various categories of actors were married ( Table 2). Contrary to the findings of Asamoah et al. [20], females were predominantly involved in picking, processing of the nuts, and trading, while production was majorly undertaken by males. With the exception of three farmers who had a tertiary level of education, none of the other actors had a tertiary level of education. ough these actors had a low level of education, they may possess very valuable knowledge in all aspects of kola nut production, processing, and marketing which could be beneficial in the development of scientific technologies acceptable to the farmers [8]. ere was no kola nut farmer association for farmers to affiliate with ( Table 2). While farmers were mostly natives of the communities, the traders/marketers were mostly settlers.

Farmer
Practices and Production. Some farmers (43%) ( Table 3) inherited their land for kola nut cultivation and a very few (0.5%) had their land for kola nut cultivation on lease arrangements. Other farmers (40%) inherited already established kola nut farms from their relatives. is is a very common practice in many kola nut growing areas in West Africa [8,22]. Most of those who established kola nut trees by themselves (82%) obtained planting materials from neighbouring farms (Table 3). e gestation period of most (54%) kola farms was 4-6 years and the dominant colour type harvested by farmers was white (Table 3). e white nuts were dominant in the Eastern region while the red nuts were dominant in the Western region ( Figure 3). e white kola nut had gained much popularity for commerce in the Eastern Region due to its preference by customers or traders in mostly Nigeria. irty-eight (38) percent of the farmers had sole kola nut farms while 62% had kola trees as an intercrop in their cocoa farms (Table 3). is is consistent with findings of studies in the Ivory Coast on cocoa-kola intercrop by Sanial and Ruf [23]. e area planted to sole kola nut was about 50% of the area planted to cocoa-kola intercropped farms ( Figure 4). e cocoa-kola intercrop was a very common practice by many kola farmers in the Eastern and Volta Regions of Ghana. is was because most of these farmers found the kola nut as an alternative source of livelihood. During the survey, some farmers noted that the kola nut trees were very resilient to harsh weather conditions, such that during, seasons of extended drought, many cocoa trees died, but the kola nut trees continued to produce nuts. In Nigeria, studies by Ekanade [24] and Oladokun and Egbe [25] noted that though yields of respective crops in a cocoa-kola association decrease, the area equivalency ratio is better than for monocultures. Nonetheless, farmers in Ghana and Cote d'Ivoire have been discouraged from intercropping cocoa farms with kola trees with the notion that kola trees encourage the growth and spread of mistletoes on cocoa farms [23]. is advice has, however, been disregarded by many cocoa farmers. e general disregard of this advice by the farmers reflects researchers and extension workers' lack of understanding of farmer practices and the kola tree's economic, social, and cultural role [23]. More recently, Osei and International Journal of Agronomy 3 Ansong [26] have indicated that mistletoe density on cocoa farms was mainly influenced by spatial arrangement of cocoa trees, while shade tree diversity and density, respectively, had a significantly negative and no relationship with mistletoe density. is confirms that kola nut trees may not be the main source of mistletoes on cocoa farms and may support why some cocoa farmers have disregarded the advice to remove intercropped kola nut tree.
Nearly all the farmers (99.5%) had not received any training on agronomic practices. Kola was mostly planted in random spacing and farmers weeded averagely twice per year. A few farmers (4.3%) planted in regular spacing at between 10 ft × 10 ft and 30 ft × 30 ft. About 25% of the farmers applied fertilizer to their kola farms at least once a year and about 78% had never pruned their farms (Table 4). Forty-four (44) percent of them had cut their kola farms. Of  International Journal of Agronomy these, 98.8% did not cut all the farm but cut-out an average of 80% and replaced mostly with cocoa trees (42%) ( Table 4). While the average age of the kola farms was 24 years, the farmers managed an average acreage of 3.4 acres. Most of the farms were planted between the 1980s and the 2000s ( Figure 5). Generally, between 2015 and 2017, a slight increase was observed for the total area under kola production for the respondents (Table 5). A similar trend was observed within every cluster of 10 km radius, except for clusters in Bono and Western South Regions ( Figure 6).

Pest and Disease Management.
Most farmers (53%) could not mention any disease of kola that affected kola trees; however, some farmers mentioned certain pests and diseases as constraining kola nut cultivation. Mistletoes (70.6%) and ants (both red and black (51.9%)) were the most stated pests (Table 6). Similarly, farmers mentioned a disease they described as "jerry" (11.7%) that affected the kola nut trees (Figure 7). Others mentioned another disease they call "turu" (4.3%) which affected the nuts harvested from the field (Figure 7). Farmers managed the diseases that affected the trees by cutting off the affected part of the kola tree and also managed the ants using insecticides meant for their cocoa (Table 6).

Constraints and Motivations to Production.
Several constraints militating against kola nut cultivation were reported by farmers. e low market price of nuts (61.5%), pests and diseases (60.4%), and lack of inputs (45.5%) were the most reported (Table 7). In spite of the constraints, farmers were motivated by several factors to continue cultivating kola nuts. Chiefs among these motivating factors were alternative livelihood support (58%), followed by the source of income (34.3%) (Figure 8).
e findings are consistent with [23].
Farmers suggested several solutions which they perceived could mitigate their constraints and enhance kola nut cultivation in Ghana (Table 8). Majorly mentioned were the provision of farm input provision (57.7%), followed by the regulating of the marketing system for price stability, and ready market as it has been for cocoa in Ghana (54.2%) and extension service support (training and sensitization) for kola farmers (24.8%).  International Journal of Agronomy

Processing of Kola Nuts in Ghana.
Sorting of kola nuts before selling to marketers was done by most of the processors (60.8%) mainly to eliminate mouldy nuts (85.2%) and insectdamaged nuts (71.7%) ( Table 9). Most processors (83.7%) found at most 10% of nuts are mouldy (Figure 9) during sorting and discarded these mouldy nuts posing an economic loss ( Table 9). Depulping of nuts was done by 48.0% of the processors. Most of these processors depulped the nuts by soaking in water (82.7%) followed by heaping on the floor and trampling with feet (49.0%). About twenty-nine percent (28.6%) out of the majority (89.8%) of the processors who rinsed their kola nuts with water after depulping added some chemicals to the water (Table 9). Consistent with Asamoah et al. [20], these chemicals include Gastoxin (aluminium phosphide) and other fumigation tablets which are locally called "bomb," and Gammalin 20 (Lindane). e most used chemical for rinsing the nuts was Akate Master (bifenthrin) (54.2%) (Figure 10). ese chemicals, however, may have attendant health hazards for both users and consumers. ere is a need for research to aid these processors on the use of appropriate hazard-free treatment methods and the correct dosage and application procedures for treating the nuts.
Kola nuts are usually bagged and preserved for storage while waiting for enough quantity to sell to traders or marketing agents within the country or across the borders. In the past, several kola nut storage experiments have reported successful storage methods [10,11]. A serious setback noticed from these experiments has been the tainting recorded with the use of the chemicals for storage. Nonetheless, processors continue to use their indigenous ways to preserve the nuts to prevent losses to kola weevils and fungi. Processors usually store by bagging nuts in sacks lined with leaves (81.9%) (Figure 11). e majority (51.0%) of the processors who cured nuts during storage mostly used fumigation tablets (91.0%) (Table 10), which may be dangerous to their health and that of consumers in the long run. Most processors doubled as marketers, while a few only processed and sold nuts to marketers for further curing before final sales to consumers or exporters. Eighty-three percent (83.4%) of the processors who cured their nuts intermittently sorted out bad nuts, looking out mostly for mouldy (83.7%) and germinated or sprouted nuts (65.7%) ( Table 10).
Several studies (e.g., [13,27,28]) noted that the traditional way of preserving kola nuts led to significant losses by  way of insect infestation, in situ germination, shrinkage, bolting, and mouldiness. Preserving the kola nuts as indicated by the majority (94.5%) of the processors was done by the following: (i) Putting nuts in sacks or baskets lined with either leaves of the Marantaceae family including "Anwonomo/Aworomo" ( aumatococcus daniefii) and "Subaha" (Marantochloa spp.) or polythene       (Table 11) e nuts are usually stored for a period of 1-3 months (81.3%) before either selling or further preservation or sorting ( Figure 12). However, it has been noted by Asamoah et al. [20] that most of the chemicals used by the processors could be very toxic to human health. ese chemicals have not been approved by the Environmental Protection Agency (EPA) and the Food and Drug Authority (FDA) of Ghana for safety in preserving the nuts which are mostly chewed by consumers. In addition, the right dosage is not known. While the kola nut industry exits and the practices of (a) (b) Figure 7: (a) A disease referred to as "Turu" by kola farmers caused by kola nut weevil. (b) A disease referred to as "Jerry" by kola farmers in Nkawkaw.  International Journal of Agronomy preserving and storing nuts continues, we suggest the urgent need for research to identify the types of chemicals that could be less harmful but very efficient in safely preserve the nuts and in addition standardize the application levels (e.g., dosage) for the preservation processes.

Marketing of Kola Nuts in Ghana.
About 42% of the respondents noted that traders preferred white kola nuts to red nuts (Table 12). Meanwhile, about 40% indicated the preference by traders for red kola nuts. Respondents who indicated the preference of the white nuts to the red nuts mostly opined that (i) the white nuts were largely patronized by foreign customers and consumers (Table 12), hence high demand, and (ii) it was always readily available since plantation handed over to them were mostly of the white kola nut. is is consistent with the findings of Ndagi et al. [8] in Nigeria. Other reasons were that the white kola tasted better and nut sizes were larger (Table 12). e white kola nut has gained popularity and preference in interregional and international trade and hence of major economic importance [8,29,30]. On one hand, respondents who gave reasons for the preference of the red nuts mostly noted that the red nuts were able to withstand diverse conditions during transportation and had longer shelf life compared with the white nuts (Table 12). is comparative assessment of the white and red kola nuts provides useful information to demand-driven breeding research for desired characteristics for both consumers and traders. Kola nuts were mostly sold to buyers/agents within the villages/communities (43.3%) and those from district capital (31.4%) in smaller units of measurement such as the use of "34 bucket" (18 L containers) (76.3%) and basin/rubber bowl (4 L containers) (10.3%) ( Table 13).
Information flow on the market transaction such as price determination and standard measurements was limited.
ere was no standard pricing or grading for kola nut in Ghana similar to Nigeria and other African countries [31]. Market transaction information on price determination, measurements, sizes of nuts, and the quality of nuts/grading  was based on mutual knowledge and understanding of the parties involved (buyers and sellers). Majority (73%) of the merchants used the "size 34 bucket" (about 18 litres) as their standard of measurement (Table 13). Buyers were mainly traders within the community (43.3%) who stored much and exported and buyers from the capital of the district within which they operated (31.4%). A few traders (3.4%) came from Burkina Faso and Ivory Coast to buy kola nuts in the communities. It was noticed that the quantity of kola nuts sold by traders and the price increased over time (Table 14). However, traders preferred an average of about 61% more for the price received in 2017 for a bag of kola nuts (Table 14).

Constraints to Processing and Marketing of Kola Nuts.
Several constraints militating against kola nut processing and marketing were outlined by processors and marketers during the study. e low selling price (74.8%) of kola nuts was perceived to be the most constraint to kola nut processing and marketing followed by pests and diseases (42.9%) with labour (1.3%) as the least constraint to kola nut processing and marketing ( Figure 13).
In respect of the constraints, the majority (95.0%) of the respondents suggested that the marketing systems of kola  Packaging and preservation process Percentage Put nuts in sacks/baskets lined with leaves/polythene-add fumigation tablet (in cotton/piece of perforated cloth/leaf ), cover sacks/baskets with leaves, store, sort intermittently 94.5 Rinse nuts in chemical solution-dry and put in basket lined with leaves, no chemical added, cover basket with leaves, store, sort intermittently 3.0 Put nuts in black polythene bag-add fumigation tablet midway in the polythene bag, seal polythene, store, sort intermittently 0.5 Put nuts in sacks-sprinkle nuts with fumigation powder, cover sack with leaves, store, sort intermittently 0.5 Put nuts in sacks/baskets lined with leaves/polythene-sprinkle nuts with chemical solution, cover with leaves, store, sort intermittently 1.  nuts should be taken over by the government and controlled as done for cocoa in Ghana (Figure 14). e majority of these respondents (78.8%) said it would enhance a reliable and ready market as well as price stability in the kola industry (Table 15). Meanwhile, the few (5%) who did not agree with the controlled marketing system like that of cocoa gave reasons such as lack of government storage facility for the nuts, fear of loss of job opportunity, and avoidance of price fixing (Table 15).

Respondents' Knowledge on the Uses of Kola Nut.
Inquiring on respondents' knowledge of the uses of kola nut, most (75.4%) responded in the affirmative and mainly indicated "chewing or consumption" (79.1%) as the major use. Medicinal purpose (5.7%) was the least mentioned (Table 16).

Summary and Conclusion
Kola nut farmers could be identified in about 129 communities across different agroecological zones in Ghana and were mostly natives of the communities. e majority (62%) of the farmers had kola farms intercropped with other crops, mainly cocoa. e gestation period of most (54%) kola farms was 4-6 years and the dominant colour type of kola nut harvested by farmers was white mostly found in the Eastern Region while    Figure 13: Constraints to kola processing and marketing in Ghana ( * multiple responses).

Yes 95%
No 5% Figure 14: Kola nuts marketing systems should be controlled as for cocoa in Ghana (N � 403). e respondents noted that traders preferred white kola nuts to red kola nuts due to their taste and sizes; meanwhile, about 40% indicated the preference by traders for red kola nuts since they can withstand diverse conditions and had a longer shelf life. Information on the market transaction such as price determination and measurements was based on mutual knowledge and understanding of the buyers and sellers. ere were no standard prices or grading systems for kola nut in Ghana as it is for Nigeria and other African countries.
In conclusion, the study has revealed some research and policy gaps concerning the breeding and agronomy of kola nut, the post-harvest practices such as processing and storage, and marketing regulations. Building on the indigenous practices of the supply-side actors and considering their constraints, there is the need for the following: (1) Further breeding programmes for the desired characteristics (e.g., tasty and bigger nut sizes, longer shelf life, and durability) of the kola nut for both consumers and traders.
(2) Further agronomic research to provide recommendations to farmers on best practices of farm management (including spacing or tree density, soil management, and pest and disease management) building from the indigenous practices of the farmers.
(3) Provision and intensification of extension services to disseminate recommendations on best management practices based on research findings. (4) Research into safe integrated curing and storage methods including the provision of less harmful chemicals and their right dosages for use. (5) Government to enable stakeholders to standardize pricing methods and grading systems for the mutual benefit of all the stakeholders.
Data Availability e data that support the findings of this study are available on request. e data are not publicly available due to privacy restrictions of research participants.

Conflicts of Interest
e authors declare that they have no conflicts of interest regarding the publication of this study. International Journal of Agronomy 15