Socio-economic characteristics of maize value chain actors in the study areas
Maize farmers in the study areas are mainly smallholder farmers with farm sizes of 2 hectares or less. The majority of the maize-producing households (95.45%) across the study areas were headed by males (Table 1). Female participation in maize farming was generally low across the sampled population. This may have largely influenced decisions on maize productivity, since most of the decisions were often taken by household heads. This result also suggests that maize is considered as men’s crop in the study areas, and women growing maize on their own land were mostly in female-headed households. Females bear the responsibility for household tasks while males are involved in farm activities and bring cash income to the household (Doss 1999). The average number of years recorded for maize production across the sampled population was about 15 years (Table 1). This implies that continuous production of maize over the years has an influence on the knowledge of the farmers in maize production with regard to agronomic practices, variety choice, budgeting, and marketing. Maize farmers interviewed in the Northern Region had more years (16 years) of experience in production compared to farmers in the Upper East and West Regions. Experience plays a major role in the uptake of technology. Studies conducted by Martey et al. (2012) revealed that experienced household heads can take better production decisions and have greater contacts which allow trading opportunities to be discovered at lower cost. Age plays a crucial role in the adoption of improved technologies. According to Wiredu et al. (2009), younger household heads are more dynamic with regards to adoption of innovations and improved technologies for crop productivity enhancement. The average age of maize farmers in the study areas is 41 years which is lower than the national average of 50 years (PHC, 2010). This implies that farmers in the study areas can be described as relatively young and can work productively for the next two decades. The majority of the farmers (89.39%) were observed to be married (Table 1). Besides companionship, married couples in farming communities usually assist each other in farm activities. An average household size of seven was recorded across the sampled population (Table 1). On regional disaggregation, Upper West Region was observed to have the highest household size of eight. The number of people living in a household has an influence on the production output and income of the household (Al-Hassan 2008). Household members often serve as a source of family labor in the crop production system. Economically, active household members often contribute significantly towards household income.
Table 1 Socio-demographic characteristics of farmers and other actors in the maize value chain in northern Ghana in 2016. NR, Northern Region; UER, Upper East Region; UWR, Upper West Region Input dealers from the sampled population across the three regions of northern Ghana were males who were married and heads of their households. The average age of input dealers across the sampled population was 39 years (Table 1). The majority of them (82.35%) have some form of formal education. This result is consistent with those of Martey et al. (2016), who found the average age of agro-input dealers in northern Ghana to be 39 years. Similarly, a survey conducted by Krausova and Banful (2009) revealed the average age of input dealers in the Northern, Upper East, and Upper West Regions to be 38.6 years. They also reported that agro-input businesses in northern Ghana are primarily male-owned and owner-managed. Maize traders across the sampled population were predominantly females (88.24%), with a small proportion (11.76%) being males (Table 1). On regional disaggregation, majority (25%) of the male traders were found in the Upper East Region. High proportions (58.83%) of the traders were educated, having some form of formal education. These results are consistent with the findings of Badu-Apraku et al. (2003). The authors found that women dominate the maize trade in northern Ghana and that females constitute 70% of all maize sellers. The average age of maize traders across the sampled population was 43 years. This shows that maize trade is gaining grounds among the economically active age group. The majority of the traders (82%) were married, with only a smaller proportion either being single, divorced, or widowed (Table 1). Small proportion (21.49%) of the traders were household heads, which can be attributed to the large number of females engaging in the activity. The average annual income of traders across the sampled population was observed to be GH¢ 7330.00, out of which 79.29% was obtained from the sale of maize grains. Maize processors in the sampled population were generally females (Table 1). The dominance of females in maize processing could be attributed to the cultural system in the three northern regions where women are normally in charge of food preparation in the household. A small proportion of processors (33.33%) were, however, household heads. Processors had an average of nine years of maize processing experience (Table 1). The Northern Region had the highest number of processors being household heads compared to the other two regions. The majority of processors (81.25%) across the sampled population were married and have had some form of formal education. The processing activities identified in the study areas included manual or mechanical threshing, winnowing, and milling. Processors across the study areas usually processed maize into readily consumable local dishes like Banku, Tuo-zaafi, Kenkey, porridge, and Kpaakpulo or in raw form as floor and dough for sale.
Trait preferences of maize value chain actors in the study areas
Kendall’s coefficient of 0.8 was obtained for farmers. This indicated that 80% of the survey respondents agreed with the ranking of traits preferred by maize farmers in the sampled population. The first most preferred trait by farmers was grain yield (Table 2). Varieties with high-yielding abilities were preferred to moderate and low-yielding ones (Supplementary Table 2). This result was highly expected, since farmers are often expectant of higher yields, and hence will prefer varieties that are high-yielding. This result corroborates earlier reports of Abdoulaye et al. (2011), Kassie et al. (2012), and Dao et al. (2015), which revealed that farmers in Ghana, Burkina Faso, Benin, Mali, Nigeria, Angola, Malawi, Zambia, and Zimbabwe consider yield potential as the most desired trait of an ideal maize variety. Grain color was considered the second most important trait in selecting maize varieties by farmers (Table 2). Varieties with white endosperm color were most preferred to varieties with yellow and mottled endosperm (Supplementary Table 2). Although both white and yellow endosperm maize varieties are grown in the study areas, it was observed that majority of the farmers grow white endosperm maize for home consumption and yellow endosperm maize for sale. These results are highly influenced by the high priority maize consumers place on grain color in Ghana. According to MoFA, white endosperm maize is the most common staple food crop produced and consumed by a vast majority of Ghanaian households. Yellow endosperm maize is primarily used in the preparation of animal feed particularly poultry feed (MoFA- SRID 2010; 2012). Empirical evidence from most surveys conducted in other African countries revealed that maize farmers and consumers will choose white endosperm maize over yellow endosperm maize (Stevens and Winter-Nelson 2008; De Groote et al. 2002; Sibiya et al. 2013). According to Ranum et al. (2014), the main reason for the preference for white endosperm maize in Africa is simply tradition; people are used to eating a white product, usually the whiter the better. Also, yellow endosperm maize is not popular in Africa because it is associated with food-aid programs and is perceived as being consumed only by poor people and animals, and some consumers perceive yellow endosperm maize to be too sweet (Ranum et al. 2014).
Table 2 Maize trait preferences of farmers and input dealers in northern Ghana in 2016. NR, Northern Region; UER, Upper East Region; UWR, Upper West Region The period of maturity of a maize variety was ranked the third most important trait by the farmers interviewed (Table 2). Early-maturing varieties were the most preferred by a large proportion (79.21%) of farmers compared to late and intermediate maturing varieties (Supplementary Table 2). This result could have been influenced by the geological location of the respondents. Northern Ghana experiences a uni-modal tropical monsoon rainfall pattern, allowing one growing season with an average annual rainfall of 900 to 1100 mm (MoFA – SRID 2012). Rainfall amount and distribution have often been very erratic in northern Ghana due largely to the impacts of global climatic change. Given that maize production in northern Ghana is predominantly carried out under rainfed conditions, the use of early-maturing varieties will increase farmers’ resilience to climate variability. Dao et al. (2015) reported that maize farmers in Burkina Faso generally grow early-maturing varieties in the northern zone of the country where the rainy season is relatively shorter but grow late-maturing varieties in the southern zone where the rainy season is of longer duration. Unlike medium to late-maturing varieties, early-maturing varieties can escape terminal drought and heat stress. They often mature before the onset of severe terminal drought and several modern early-maturing varieties also possess drought tolerance genes making them most suitable for drought-prone areas in northern Ghana and other countries in sub-Saharan Africa (Bänziger et al. 2000; Badu-Apraku and Fakorede 2017). The preference for early-maturing varieties by farmers in the study areas corroborates earlier findings that revealed that early-maturing varieties are increasingly becoming important in drought-prone areas of West Africa (Benin, Ghana, Mali, and Nigeria) (Abdoulaye et al. 2011) and also in Southern Africa (Angola, Malawi, Mozambique, Zambia, and Zimbabwe) (Kassie et al. 2012) due to increasing unreliability and unpredictability of weather patterns. Cob size was ranked the fourth most important trait ahead of other agronomic traits like plant height, number of cobs per plant, and cob fill (Table 2). The majority of the farmers (82.61%) were of the view that varieties with bigger cobs produced higher yields compared to cobs of medium and small sizes (Supplementary Table 2). Farmers consider cob size as a key yield-related trait, and they usually use cob size for visual selection of varieties with high yield. Findings of De Groote et al. (2002), Kasoma et al. (2020), and Yatai et al. (2020) revealed that top varieties that receive farmers’ highest score for grain yield are usually the same as those that receive the highest ranks for cob size. Nitrogen use efficiency was ranked as the fifth most important trait by farmers ahead of other stress response traits like drought tolerance (ranked 7th), pest and disease resistance (ranked 8th), and Striga resistance (ranked 16th) (Table 2). Varieties with high nitrogen use efficiency were preferred to moderate- and low-N-efficient ones (Supplementary Table 2). Northern Ghana has poor soils with declining soil fertility (Abdoulaye et al. 2011; Etwire et al. 2013). Ellis-Jones et al. (2012) identified low and declining soil fertility and high cost of agro-inputs as major crop production constraints in northern Ghana. Farmers’ preference for nitrogen use efficient varieties could be a risk coping strategy, a perceived economical way of improving their maize yields without overly depending on chemical fertilizers. The findings of Ribeiro et al. (2017) revealed low soil fertility as the most dominant constraint in maize productivity in Wenchi and Ejura Sekyedumase districts in Ghana. In Angola, Mozambique, and Zimbabwe, a variety’s performance under poor soil fertility is an important trait considered along with yield potential in the selection of an ideal maize variety by farmers (Kassie et al. 2012).
In the study areas, the most preferred traits by input dealers, in order of importance, were grain color, days to maturity, grain yield, access to seed, and grain size. Input dealers preferred white endosperm varieties, early-maturing varieties, and high-yielding varieties with grain of large size. Kendell’s coefficient of concordance indicated that 60% of the sampled input dealers agreed with each other on the ranking of the traits (Table 2). The trait attributes preferred by input dealers were similar to the preferences of farmers. Grain yield, grain color, and days to maturity were the top three traits considered by both farmers and input dealers in selecting maize varieties across the three regions in northern Ghana. Although preference ranks by both actors were different, the attributes of these traits preferred by both actors were the same (Supplementary Table 2). This result is expected as input dealers are not direct users of the maize varieties and thus will only commercialize varieties with traits frequently demanded by their main customers, who are the farmers. Access to seeds was ranked the fourth and sixth most important determinant of variety adoption by input dealers and farmers, respectively. At the community level, farmers complained about the unavailability of high-quality seeds of high-yielding and stress-tolerant varieties in their communities to enhance crop production. The report of Ellis-Jones et al. (2012) identified lack of improved seeds as the first and second most important constraints to crop production in Upper West and Northern Regions, respectively. A report by USAID-EAT (2012) indicated that less than 10% of maize farmers in the Northern Region have access to improved seeds. The results of the present study suggest that farmer’s poor access to improved seed is a major constraint to maize production and adoption of new varieties in rural communities in northern Ghana.
About 50% of traders and 40% of processors in the sampled population agreed with the ranking of the traits they prefer, respectively (Fig. 2). For traders, grain color, grain size, and market price of grains were ranked as the most important traits, in that order (Fig. 2). Processors also ranked grain color as the first most important trait they consider in selecting maize varieties for processing (Fig. 2). Grain size, market price of grain, consistency of the cooked meals, and their nutritional value were considered as the second to fifth most important traits, respectively. Traders and processors highly preferred maize varieties with white endosperm to those that have yellow and mottle endosperm (Supplementary Table 2). A lot of attention was paid to grain color because the traders were of the view that consumers consider it most when purchasing maize grains. According to the processors, consumers usually find maize product of white endosperm maize more appealing compared to those prepared with yellow endosperm maize. Preference for grain size was high among majority of the input dealers, traders, and processors (Table 3 and Fig. 2). According to traders and input dealers, larger grains/seeds usually attract high market price compared to medium and small grains/seeds. According to processors, maize varieties that have larger grains produce more flour compared to varieties that have smaller grain size. However, some of the respondents were of the view that medium-sized grains have less chaff and high flour quantity when milled compared to large-sized grains. The trait preferences of processors were influenced by local product preferences and processing methods. The most important organoleptic traits considered by processors were consistency of the cooked meals (4th), the flour quantity (5th), and texture of the cooked meals (6th) (Fig. 2). Processors preferred maize grains that give heavy starch when processed. The majority of the processors in the sampled population preferred maize meals with smooth texture over those that are rough, hard, lumpy, and gritty. They also preferred their cooked meals not to change in consistency after cooking (Supplementary Table 2). These organoleptic traits are linked to grain qualities of a variety (i.e., texture of the endosperm, size and shape, and thickness of the pericarp) and its behavior in processing (hulling or milling) (FAO 1998). These results imply that processors in northern Ghana prefer mostly maize varieties with dent grain type and to some extent semi-dent grain types. This is because dent grains have a higher percentage of soft starch which can easily be milled to fine flour, while flint maize has a hard and vitreous endosperm and a gritty texture (Sylvie De Buck 2017). Empirical evidence of variety adoption patterns in Africa indicates that farmers prefer local varieties that give better results after processing than improved varieties with high grain yield potential but give poor processing results: In Togo, maize varieties that have soft grains are more appreciated since they give fine flour with minimum grinding. Improved varieties such as NH1F, Mexico 8049, or TZSR having similar processing qualities are well adopted by farmers in Togo. On the other hand, a variety like La Posta, needing 2 or 3 passes through the mill, is more costly to process and therefore is of little interest (FAO 1998). In Benin, consumers prefer to make “lifin” (a traditional maize flour) using local varieties that have more friable grains which give fine flour with lower damaged starch content when milled while the improved varieties with vitreous and hard grains give coarse flour when processed (Nago et al. 1997).
Table 3 Correlation matrix of important principal components of traits considered by farmers and input dealers, and traders, and processors in Northern Ghana when selecting maize varieties. Market price of grains was identified as an important criterion used by input dealers, processors, and traders in the study areas in the selection of maize varieties. It had the highest rankings among processors (second important trait), while traders and input dealers ranked it as the third and sixth important trait, respectively (Tables 1 and 2, and Fig. 2). Fluctuation in market prices was preferred to constant market prices by all three actors. At the community level, market prices of grains are often set by traders with little to no participation by other actors. Prices are determined mainly based on the transport cost and time of the year. Both farm-gate and wholesale prices increase as distance to major markets and transport costs increases. Also, prices are low soon after harvesting and higher during the off-season (Sarpong and Anim-Somuah 2015). Traits like grain size and grain color also influence market prices and must be considered carefully in variety development. Yellow endosperm maize is usually sold at a higher price than white endosperm maize.
Principal component analysis of traits considered by maize value chain actors in selecting maize varieties
The PCA of trait preferences of both farmers and input dealers revealed 8 principal components (PCs) having eigenvalue greater than 1 (Supplementary Table 3). The 8 PCs explained 64.23% of the total variation within the combined dataset on traits preferred by farmers and input dealers in selecting an ideal maize variety (Supplementary Table 3). Eleven out of the 21 traits studied were identified as the main traits that influenced the selection criteria of farmers and input dealers: In order of importance, these traits were drought tolerance, Striga resistance, cob size, market price of grain, days to maturity, grain color, nutritional value, grain yield, grain shape, grain size, and plant height (Table 3). This result suggested that although grain yield is among the most preferred traits of both farmers and input dealers, traits like drought tolerance, Striga resistance, cob size, market price of grain, days to maturity, grain color, and nutritional value were of high priority to both actors than grain yield during variety selection. Trait preferences tacitly indicate the objectives and priorities of actors, and preferences are also dictated by the opportunities and constraints value chain actors face in their enterprise selection and management (Kassie et al. 2012), Therefore, farmers’ strong interest in traits such as drought tolerance, Striga resistance, and early maturity, and also in market price of grains, grain color, and nutritional value implies that farmers are not only interested in high-yielding varieties but are also most interested in varieties that are adapted to their production constraints and also suitable to the preferences of local consumers. Yield loss due to drought stress is estimated at 49–70% of the annual maize produced in SSA. The incidence and severity of drought are predicted to rise due to global climate change. The over-reliance of farmers on rainfall increases the vulnerability of maize production systems to climate variability and change (Kogo et al. 2020; Ndlovu et al. 2020). Therefore, drought-tolerant varieties will play an important role in adaptation to climate change (Kogo et al. 2020; Ndlovu et al. 2020). Farmers and input dealers’ strong preference for drought-tolerant varieties reflects their perceived vulnerability to drought and also shows their awareness of the potential benefits of drought-tolerant varieties. Community analyses of cereal-based farming systems in Northern, Upper West, and Upper East Regions of Ghana by Ellis-Jones et al. (2012) identified drought and Striga infestation as the fourth and sixth most important constraints to crop production in Upper West and Northern Regions, respectively. In a community survey by Abdoulaye et al. (2011), drought was frequently cited by farmers as a major constraint to maize production in Benin, Ghana, and Nigeria. In Malawi, Zambia, and Zimbabwe, drought is reported as the most important challenge on the livelihoods of maize farmers, whereas in Angola and Mozambique, drought is reported as the second most important challenge to farmers, next to sickness and mortality of a family member. In all the countries above, strategies adopted by farmers to cope with drought include planting of early-maturing and drought-tolerant varieties.
The PCA of traits preferences of both traders and processors revealed 4 principal components (PCs) having eigenvalues greater than 1 (Supplementary Table 3). The 4 PCs explained 68.04% of the total variation within the combined dataset on traits considered important by traders and processors in selecting an ideal maize variety (Supplementary Table 3). Grain size, market price of grain, grain color, and consistency of cooked meal had the highest loading on PC1, respectively (Table 3). Thus, they are the traits with the highest influence on the selection criteria of traders and input dealers. Traits such as grain shape and flour quantity and nutritional value and texture of cooked meals were identified, respectively, as the second and third orders of important traits by both actors (Table 3). The PCA results revealed that farmers, input dealers, traders, and processors in the sampled population consider grain color, grain size, market price of grains, nutritional value, and consistency of cooked meals when selecting a maize variety for their enterprises (Table 3). As discussed earlier, preferences for all of these five traits by the different value chain actors are dictated by local consumers’ preferences. This result corroborated the findings of FAO-AGSE (1994), Heisey and Smale (1995), and Smale et al. (2011) that indicated that although the importance of a trait has different implications depending on the role of an actor in a value chain, as long as a typical value chain revolves around the needs of consumers, consumer preferences will always determine the overall acceptance of a variety. The overall implication of the results of the PCA analyses is that consumer preferences are important but need to be adjusted with production constraints.
Mean grain yield and other agronomic performance of the early-maturing hybrids evaluated in the participatory variety selection trials
The mean grain yield of the varieties across mother and baby trials was 2.8 t/ha. The top three yielding hybrids across the four districts were EYH-29, EYH-42, and EYH-19, respectively. EYH-29, EYH-42, and EYH-19 out-yielded the best local check (Farmer variety 2) by 45.3%, 34%, and 20.8%, respectively (Table 4). EYH-29, EYH-42, and EWH-19 produced the highest yield in West Gonja and Binduri districts. In Tolon and Sissala East districts, EYH-29, EYH-42, and EWH-29 were the top three yielding hybrids. Higher grain yield was associated with taller plants, more ears per plant, and good plant and ear aspects (Table 4).
Table 4 Mean agronomic performance of early-maturing hybrids evaluated on-farm in West Gonja (WG), Binduri (BI), Tolon (TL), and Sissala East districts in 2014 to 2016. NB: *, ** = significant at 5 and 1% level of probability, respectively; ns, not significant; EWH, early white hybrid; EYH, early yellow hybrid; EQWH, early quality protein maize hybrid Varietal traits and genotypes preferred by producers
Farmers’ preferences for the eight hybrids varied across districts (Fig. 3). In Sissala East district, farmers ranked EYH-29 and EYH-42 as the most preferred hybrids. EYH-29 was the most preferred hybrid by farmers in West Gonja and Tolon districts. In Binduri district, farmers ranked both EWH-29 and EYH-29 as the most preferred hybrids. Across districts, the most preferred hybrids had higher grain yield, early maturity, bigger and fully filled cobs with multiple ears per plant, and excellent ear aspect (Table 4). Varieties with vigorous growth and thick green leaves at the vegetative stage were also preferred by farmers. Farmers considered varieties with thick green leaves at the vegetative stage to have a better response to nitrogen fertilizer use. The most common selection criteria used by farmers across districts and gender included grain yield (83.5%), grain color (78.8%), plant vigor (75%), nutrient use efficient (66.7%), cob filling (66.7%), drought tolerance (65%), and cob size (61.3%) (Fig. 4). The results of both the PVS trials and PRA survey identified grain yield, grain color, nutrient use efficiency, cob filling, drought tolerance, and cob size as very important traits in the variety selection criteria of farmers (Table 2 and Fig. 4). Therefore, they must be considered as key traits in maize breeding programs. Most importantly, the preferred attributes of the individual traits by farmers as identified in this study must be taken into consideration during variety development to enhance the adoption of new improved varieties by farmers in the study areas. Generally, the conduct of the PVS trials afforded the research team of the MIP of CSIR-SARI an opportunity to interact with participating farmers and witness at first-hand different selection criteria applied/used by maize farmers in the study areas. The PVS trials helped to identify hybrids which were considered superior to some released varieties adopted by farmers in Tolon, West Gonja, Binduri, and Sissala East districts. In 2017, the hybrids EYH-29 and EWH-29 were recommended by the MIP of CSIR-SARI to the National Variety Release and Registration Committee for release to stakeholders in Ghana. All two hybrids were officially released and registered in the national catalog of crop varieties released in Ghana in 2019. The release names of EYH-29 and EWH-29 are CSIR-Denbea and CSIR-Similenu, respectively. Other information on these two hybrids are available in Adu et al. (2017).