1. Introduction
Agriculture is the backbone of many people in developing countries. The worlds’ population is expected to reach 10 Billion by 2050, thus putting pressure on food production to increase and to accommodate the growing population [
1]. Enhancing crop production is considered essential for improving farmers’ and peoples’ welfare in these developing countries. This means that the control of agriculture as the primary source of food and job creation must be enhanced in developing countries as it is the only strategy to fight poverty and food insecurity [
2]. Adopting improved maize varieties is seen as one of the approaches available to meet the worlds’ consumption demand [
3].
Maize (
Zea mays) is also called corn and is the third most vital cereal crop after wheat and rice [
2]. Maize is the most grown crop in many developing countries, especially Sub-Saharan Africa (SSA), contributing immensely to the SSA economy [
2,
3]. This cereal crop is an essential staple crop produced by most smallholder farmers and produced under diverse SSA environments [
4]. Although commercial and resource-poor farmers have this crop, it is primarily dominated by resource-poor farmers in low-input environments. It is extensively consumed as a staple food by poor rural and urban households [
5,
6]. Maize occupies the largest land area of all staples in SSA; annual maize grain production is projected at nearly 72 million metric tons (MT) [
4,
5,
7]. Maize covers about 45% of the cultivated area generating about 50% of rural cash income and employment in developing countries. The crop is used to make local drinks, soup, and livestock feed [
8,
9]. About 60% of the cropping area in South Africa is estimated to be planted with maize; this indicates that maize is the largest crop grown by smallholder farmers in the country [
10]. Maize is generally grown in semi-arid regions of South Africa and is primarily rain-fed [
10]. Production of maize is influenced by changing climatic patterns and farmers’ planting intentions, particularly the need to produce output in surplus of their subsistence requirements. Droughts and floods destabilize crop yields and cumulative production by decreasing food availability and agricultural returns [
11]. For example, in the past decade, growth in maize production has primarily been due to area increase rather than yield improvement [
8,
12]. As a result, this inhibits further investment on maize production and economic growth of SSA.
South Africa experiences several factors which affect maize production, such as low levels of education, agronomic challenges, credit accessibility, availability of the extension service, low per capita income, and little investment in production technology [
6,
13]. Change in climatic conditions is another critical factor that affects maize production, especially prolonged drought spells. Multi-year drought spells have occurred in the last decade and have reduced maize production [
14]. Notably, Eastern Cape Province (ECP), is the poorest province out of the nine provinces in South Africa, and since 2015, this region has been affected severely by drought [
14]. Since farmers in the province solemnly depend on rainfall for maize production, it suffers the most because of drought. [
15,
16].
Increasing productivity is of urgent obligation for the maize industry, mainly smallholder farmers in developing countries. For instance, improved seed varieties that can withstand unfavorable climatic and soil factors might be instrumental in increasing productivity and yield. Enhancing crop production is considered necessary for improving the welfare of smallholder farmers whose livelihoods depend solely on farming through the development and improvement of agricultural practices and the availability of improved seed varieties. Adopting these high-yield varieties by large and smallholder farmers is expected to motivate increased crop production, which can ultimately assist in reducing poverty and increase rural household food security [
17]. Using the improved maize varieties increases yield, consumption, and food security [
18]. In a study conducted in Mexico, it was found that the adoption and use of hybrid maize had a positive impact on household welfare. A study conducted in Pakistan revealed that improved maize varieties’ adoption had increased grain yield, farm returns, and food security [
18]. In Malawi, improved maize varieties were found to have a positive effect as they increased crop yield, disease resistance, price advantage, storability, and market demand [
19]. Improved maize varieties have been observed to sustain maize production, mainly under smallholder farming conditions [
20]. The development of improved maize varieties continues to be a significant objective of improved maize programs and research institutes across the globe. If farmers adopt these improved OPVs, maize can provide considerable financial benefits through increased grain harvests and reduced risk.
The adoption of improved maize seed varieties has long been recognized to enhance crop yield and farm returns, thereby enabling crop diversification and enhanced market participation. Yet, surprisingly, the uptake and adoption of these varieties have been slow. This is because smallholder farmers in South Africa are resource-poor, making it hard to buy improved maize varieties such as OPVs and hybrid seeds [
21]. As a result, farmers tend to use normal traditional seeds from their harvest, not enhancing crop production. The smallholder farmers use traditional varieties whose productivity is relatively low compared to the improved maize varieties. Adopting enhanced maize varieties is mainly due to less accessibility and high prices, resulting in lower maize production [
22].
Multiple previous studies have been conducted on the estimation of the relationship between the inputs and output of agriculture [
23,
24], while some studies determined the impact of climate change on crop productivity [
25,
26]. Moreover, studies have focused on the socio-psychological behavior of farmers to adopt improved technology [
27,
28]. However, limited studies have focused on the adoption drivers of improved open-pollinated maize varieties by smallholder farmers. Additionally, in South Africa, no study has focused on assessing the adoption drivers of improved maize varieties by farmers with the intention to enhance maize productivity and farm returns. Therefore, the current study covers the research gap and contributes to the existing literature on farmers’ intention to use improved maize farmers in South Africa. Therefore, the current article aims to ascertain factors affecting the adoption of improved maize seed varieties (OPVs) in the Eastern Cape Province of South Africa. The remainder of this paper is organized as follows. The second section discusses the data and the methods used. This section is followed by the results and discussion. The last section concludes the study. The study hypothesis is that the driving factors of adoption of improved maize varieties by smallholder maize farmers are socio-economic and institutional factors.
Conceptual Framework of Using OPVs by Smallholder Farmers
Based on consumer behavior theory, smallholder farmers’ use of new technology is influenced by countless factors, including technology, socioeconomic factors, policy, research, and institutional factors. Thus, it is necessary to understand these factors as technology innovation is vital in fast-tracking Sustainable Development Goals (SDGs), especially the first objective to eradicate all forms of poverty and malnutrition.
Farmers are faced with the uphill of producing more to meet the growing population, especially in developing countries. Moreover, farming is challenged by many factors such as weather conditions, lack of innovation, and transaction costs. The use of innovative practices is the only solution that farmers can use to improve their productivity and enhance farm returns. The adoption of improved maize varieties is observed as a link between various actors that enable the movement of information and seed to the farmer and then output from the farmer to the market in exchange for money to improve the standard of living [
12]. Adopting technology is a self-motivated process and in the context of risky production, such as that of the agricultural sector, where production structure is essential as many people rely on agriculture for livelihoods generation [
22]. However, to improve the productivity of the maize sector, the adoption of improved seeds should form part of the adoption of a technological package by smallholder farmers.
Figure 1 below illustrates the conceptual framework of smallholder farmers’ adoption of improved maize variety.
The adoption of agricultural technologies such as the OPV maize varieties is primarily constrained by many factors such as socioeconomic, institutional, external, social factors, and cultural contexts among smallholder farmers. This conceptual framework assumes that farmers’ decisions to use improved maize seeds (OPVs) are influenced by socio-economic factors (such as age, education, sex, and family size). It is further assumed that these farmers’ factors and familiarity with the technology also play a significant role in influencing the decision of farmers to use OPVs. Furthermore, the institutional factors, characteristics of agricultural innovation, supportive policy, and external factors encourage farmers to use improved maize seed and other technologies that improve productivity.
With the assumption that farmers adopt the improved maize variety, it means the yields will improve, leading to increased crop productivity and farm returns. The main reason for adopting enhanced maize varieties (OPVs) are increased crop productivity and farm returns [
23]. The adoption of improved maize varieties is a savior for most of the population in most parts of Africa that depend on agricultural production and yet live among drought-prone regions. This adoption increases crop productivity and farm returns. It further assists maize farmers and households in lessening food insecurity and alleviating poverty at the household level.
Understanding drivers of improved maize variety adoption by smallholder farmers is crucial to developing policies for agricultural development and meeting the growing population. Several socio-economic and institutional factors may restrict the adoption of improved maize varieties by emerging maize growers [
23,
29]. Multiple previous studies at a global level have been conducted to focus on the relationship between the inputs and outputs of agriculture. In contrast, some studies focused on determining the impact of climate change on crop productivity. Moreover, studies conducted on the socio-psychological behavior of farmers have also been conducted to adopt improved technology. However, limited studies have focused on the adoption drivers of improved open-pollinated maize varieties by smallholder farmers.
Additionally, in South Africa, no study has focused on assessing the adoption drivers of improved maize varieties to enhance maize productivity and farm returns. Therefore, the current study covers the research gap and contributes to the existing literature on farmers’ choice to use improved maize farmers in South Africa. Thus, the present article aims to ascertain factors affecting the adoption of improved maize seed varieties (OPVs) in the Eastern Cape Province of South Africa.
The remainder of this paper is organized as follows. The second section discusses the data and the methods used. The results and discussion follow this section. The last section concludes the study.
2. Materials and Methods
2.1. Selection of the Study Area
The study was conducted in the Eastern Cape Province, the third-largest Province in South Africa. The province has a population of 6,562,053, and the majority of the people reside in rural areas and derive their livings from practicing agriculture. The persistent poverty is the reason that this province lies below the poverty line [
30,
31]. The region presents an agricultural background (crop, vegetable, citrus, and livestock farming) spread with a trivial number of agro-industrial and eco-tourism infrastructures.
Agricultural production is mainly practiced by smallholder farmers, although few commercial farmers primarily practice citrus farming. Smallholder farmers are mainly involved in agriculture for home consumption and agribusiness. Agricultural production is declining due to climate change, lack of credit, and ancient farming techniques. Sibanda et al. [
21] and Mnkeni [
32] agree that the province is characterized by smallholder farmers who are low-income and resource poor. The region is hit by persistent drought, which adversely affects agricultural productivity [
33]. The use of improved open-pollinated maize varieties (OPVs) is one of the modern innovations which farmers in South Africa adopt to enhance productivity, improve food security, and alleviate poverty.
2.2. Research Design
The approach of this paper is an inquiry that involves the use of the quantitative approach. This approach played an important role in gathering empirical evidence on the nature of smallholders’ adoption of improved open pollination maize varieties to increase farming participation in the economy. The research was mixed method at heart, thus allowing the researchers to draw a more holistic picture of the potentials of improved open pollination maize variety, factors influencing adoption, and challenges faced by farmers in using improved open pollination maize varieties. The study adopted a cross-sectional research design where data were collected at one point on several variables such as demographics, household socioeconomic factors, and data on challenging factors in the adoption of improved open-pollinated maize varieties (OPVs).
2.3. Sampling Techniques and Sample Determination
The study was quantitative. A cross-sectional research design was used to collect data at one point in time. A multi-stage sampling procedure was employed in this study. The first stage was the selection of two District Municipalities where smallholder farming is more active, OR Tambo and Joe Gqabi District Municipalities. The second stage purposely selected four local municipalities based on their agricultural activities provided by agricultural extension officers. The last stage and final stage, random selection, was used to choose maize farmers. Smallholder maize farmers were the unit of analysis. The randomly selected maize farmers in the selected local municipalities were functional and enhanced farmers’ livelihoods. These maize farmers were suitable for this study as they were situated in different municipalities and communities, as well as using different agricultural techniques. The sample size was 150 maize farmers.
2.4. Data Collection
A structured questionnaire was administered during single-visit interviews on respondents and was used as the primary data collection tool with the use home language, IsiXhosa. Questionnaires were arranged and distributed on a farmer-to-farmer basis. The questionnaire was pretested before it was finalized. Pretesting was conducted to improve the questionnaire and check on essential aspects such as the time taken to complete the questionnaire and the suitability and appropriateness of the questions. Time considerations were imperative in the questionnaire administration, given the level of farmer exhaustion in the study area. Pretesting was conducted in the same community with a few farmers who did not participate in the primary survey. Data collected were on farm characteristics, adoption of improved maize varieties, challenges faced in adopting, and factors hindering smallholder farmers’ adoption of improved maize varieties. Primary data was collected from sample respondents who practiced maize farming through a structured interview schedule, which was intended to generate data on some individual, institutional, economic, and demographic variables, which are hypothesized to influence the adoption decision of the farming head on improved maize varieties. Additionally, information on the knowledge and attitudes on improved maize farmers, factors and risk affecting farmers decisions, and lastly, challenges faced by farmers in adopting the improved maize varieties. The structured questions were collected in the form of closed-ended questions where farmers were selecting from the options provided and open-ended questions where it was possible to allow farmers to further explain their answers. Data collected were on farm characteristics, adoption of improved maize varieties, challenges faced in adopting, and factors hindering adoption of improved maize varieties by smallholder farmers. Secondary data from published work, departmental information, and other research works conducted before were also used. Data collection was conducted by five well-trained enumerators in the Local Municipalities chosen.
Table 1 describes the data, their measurement types, and their hypothesized relationship with the dependent variables. Data collection was conducted in September 2018.
The collected data were entered into Excel and were analyzed using STATA 15. The study applied descriptive statistics and inferential analysis to investigate knowledge of improved open-pollinated maize varieties (OPVs) and challenges smallholder farmers face. A Logit regression model was employed to estimate the factors influencing the adoption of open- maize varieties by smallholder farmers in the study.
2.5. Descriptive Statistics and Inferential Analysis
Descriptions of the variables used in the logistic regression model to show the knowledge of improved open pollination of maize varieties and challenges faced by smallholder farmers were performed using descriptive statistics and t-statistics. The results of this analysis were presented using frequency tables, cross-tabulations, and graphs. For continuous variables, mean and standard deviations were reported, while for categorical variables, percentages were reported.
2.6. Analytical Analysis
The study used Logit regression to determine the factors that have significant influence on the smallholder adoption of improved open-pollinated maize varieties (OPVs) in the study area. This method was chosen because it is a standard analysis method when the outcome variable is dichotomously measured as having a value of 1 or 0, where 1 = adopted OPVs and 0 = not adopted OPVs. Logit regression is advantageous because it estimates the dichotomous outcome variables, which are more straightforward and flexible to make results more meaningful for interpretation [
34,
35].
Xi represents the set of parameters which influence the adoption of open pollination of maize variety of the farmer.
This model was employed because it accommodates two categories in the dependent variable. It can resolve the heteroscedasticity problem, and it pleases the cumulative normal probability distribution [
34,
36]. Hence, the logistic model was selected for this study. Let π
i be the probability of success. Additionally, consider
x = (
x1,
x2,…,
xn) as a set of explanatory variables which can be discrete, continuous, or a combination of both discrete and continuous. Then, the logistic function for πi is given by Equation (1):
where:
Here, πi denotes the probability that a sample is in a given category of the dichotomous response variable, commonly called as the “success probability” and, clearly, 0 ≤ πi ≤ 1. Λ(.) is the logistic cdf, with λ(z) = ez/(1 + e−z) = 1/ (1 + e−z), and β represents a vector of parameters to be estimated (Joshi and Dhaka, 2021). The expression is called the odds ratio or relative risk.
Estimation and Likelihood Ratio Test
Maximum likelihood is the preferred method to estimate
β since it has better statistical properties, although we can use the least-squares approach. Consider the following logistic model with the single predictor variable
X given by the logistic function of:
We wish to find the estimates such that plugging βˆ into the model for π(
X) gives a number close to 1 for all subjects who have adopted improved maize varieties and 0 otherwise. Mathematically, the likelihood function is given by Equation (4):
The estimates of
βˆ are chosen to maximize this likelihood function. We take the logarithm on both sides to calculate and use the log-likelihood function for the estimation purpose. We used the likelihood ratio to test if any subset of estimates β is zero. Suppose that
p and
r represent the number of
β in the full model and the reduced model, respectively. The likelihood ratio test statistic is given by Equation (5):
where
l(
βˆ) and
l(
βˆ
(0)) are the log likelihoods of the full model and the reduced model, respectively, evaluated at the maximum likelihood estimation (MLE) of that reduced and Λ∗∼χ 2
n −
r;
n and
r are the number of parameters in the full and the reduced model, respectively.
Adoption of agricultural technology occurs when the predictable utility from the technology exceeds that of non-adoption. Since utility is not observable, single or multivariate limited dependent models have been a workhorse for estimating factors affecting adoption. Adoption involves factors that are normally beyond the control of farmers, such as policy, institutional and environmental factors, as well as household endowments, the agricultural business opportunities available, and the nature of the technology itself. Furthermore, some of the factors that influence the continued use of the technology are associated with the user’s experience in using it; the more farmers become knowledgeable to the use of a technology, the more they are likely to keep on using it. These phenomena generate modelling problems related to self-selection and endogeneity. The binary nature of values of the response variable decision narrow down our choice of analytical method to probit, binary and logit regression options.
The Logit was selected because of its capacity to better answer our main research questions and because of our data and sample characteristics (association between variables, slope tells how the log odds ratio in favor of adoption of improved maize varieties changes as independent variable change). Additionally, the significant explanatory variables do not have the same level of impact on the adoption decision of farmers. The relative effect of a given quantitative explanatory variable on the adoption decision is measured by examining adoption elasticity, which is why Logit is the most suitable model to be used. The variables that were assumed to influence the adoption decision of improved maize varieties were tested for multicollinearity. The Logit model was used as it offers the possibility to save the predicted variables used to estimate drivers of adoption automatically. Logit fits this type of study due to the cumulative nature of the variables used in the study since they assume a cumulative normal distribution, which leads to efficient estimators. This model characterizes adoption by the sample farmers so that it allows maximum likelihood estimation.
2.7. Reliability and Validity
Triangulation was used in this paper to identify similarities and differences in the data collected from respondents via interviews and observations, thus improving the reliability of the study findings and interpretations. A face validity of the questionnaire was confirmed by a panel of experts in Department of Agriculture, Agricultural Extensionist, Community Leaders, 2 Academic staff, and Research experts. To ensure the reliability of the questionnaire, a split half technique was used to determine the reliability coefficient with R = 0.68. The questionnaire was tailored to the needs of the subjects to whom it was intended (Bless and Higson-Smith, 2000). Their recommendations and amendments were incorporated into the final questionnaire used for data collection in the study. An updated list of smallholder maize growers was obtained from Department of Agriculture and Farm Organizations, thereby managing farmer error. Farmers who appeared on the list yet were no longer growing maize were removed to control for selection error.
4. Discussion
This paper sought to analyze the determinants of adoption drivers of improved open-llinated (OPVs) maize varieties by smallholder farmers in the Eastern Cape Province of South Africa. This was achieved by first estimating descriptive statistics to profile the farmers, their knowledge, the types of improved maize varieties they used, and the challenges they faced, taking Logit regression into effect to estimate the drivers of adoption of improved maize varieties. To achieve all these objectives, the study made use of cross-sectional research design and collected data through the use of structured questionnaires, which captured all the required details.
The descriptive results showed that farmers are aware of the improved maize varieties and their usage, but adoption of OPVs is lower as the majority of the farmers opted for hybrids. This was associated with the fact that the hybrid variety is availability in supermarkets as compared to OPVs, which are not easily available. Farming in the province is practiced by female farmers, with an average age of 42 years. This is due to the fact that females are the ones who are left behind to take care of their families while their male counterparts are working in the corporate world and assist with financial backing. The majority of these females are involved in maize projects and home gardens, which supply their household for household consumption and surpluses for income generation. Family size was used as a proxy for family labor as they had an average of six people per household, and they were helping when it comes to farming as well as sharing information. Maize farmers were literate as they spent 10 years in school, which plays a crucial role in assessing the agricultural information and innovative techniques which are used in farming. Additionally, education made it easy for farmers to use and adopt different improved maize varieties available at their disposal. The majority of farmers were full time farmers, which made it easy to know what exactly their farm needs in order to enhance productivity and withstand the changing weather conditions. They farm at 3 ha, which is reasonable for smallholder farmers, and they derive their livelihoods from farming. This farm size is very efficient if it is utilized right by farmers. Farmers were relying on social grants, income generated from surpluses, and remittances to operate their farming business. Maize farmers had access to extension services and were members of farm organization which was beneficial to them in terms of providing training, sharing new information, providing market information, and new inputs being used to enhance agricultural output.
The results reveal that farmers in the study area were using three types of improved maize varieties, namely, hybrid, OPVs, and local seeds. The hybrid variety was widely used as farmers were able to obtain them in local supermarkets and were affordable to them, while OPVs were also used but at a lower rate due to their unavailability and higher price. Local seeds were also used, but their yield was very low compared to these two types of improved maize varieties.
Farmers face challenges in using OPVs in the study area and this affected their adoption rate of this type of improved maize varieties. The main challenges were that OPVs were not easily available to local markets where farmers reside and made it hard to be used. This led OPVs to be sold at high costs, which limited the majority of maize farmers as they cannot afford them as they lack financial support since depends on social securities for farm operations and take care of the households. Other challenges which constrain farmers are lack of knowledge and high cost of labor. Many farmers who do not use the OPVs lacked knowledge when it comes to them, and they were unable to differentiate OPVs and hybrid, which ultimate results in them selecting hybrid. Additionally, the mentioned cost of labor required for this type of improved maize varieties forces them to look for cheaper and easier-to-use types. Lack of finances made it hard for farmers to use OPVs, as they are expensive and cannot afford them. The poor labelling of these improved maize varieties is another challenge faced by smallholder farmers.
The empirical results reveal that adoption drivers of OPVs as improved maize varieties is influenced by socio-economic and institutional factors. The study results reveal that access to extension services, years spent in school, increase in household income, farm size and perception factor for accepting improved seeds: OPVs contribute positively to the adoption of improved maize varieties. This suggests that any increase in any of the variables will increase the probability of adopting improved maize varieties in order to enhance agricultural output. The improvement in yield will contribute positively to household food security and farm revenue, which are declining, especially in rural areas in African countries. The distance to market and the unavailability of OPVs in local shops were found to adversely affect adoption as farmers were unable to travel such a long distance given that they are located far from town. Additionally, a lack of financial support was the determining factor in purchasing them outside their local markets since they are unavailable to local shops. The adoption of OPVs by smallholder farmers in developing countries will need more than just training to farmers but financial support so that they can be able to purchase required agronomic practices and markets must be developed close to where farmers are located.
5. Conclusions
The study investigated the driving factors affecting the adoption of Open-Pollinated Maize Varieties (OPVs) in the study area. This study used a multi-stage random sampling method to collect the data from 150 maize farmers through a face-to-face interview. Descriptive statistics and logit regression were used for analysis purposes. Due to financial reasons and time constraints, the study was limited to three district municipalities that practice maize farming. Farmers use improved maize varieties as means of enhancing their farm outputs and farm returns. The study found that most maize farmers prefer to use the hybrid maize variety than OPVs due to their availability in supermarkets compared to OPVs, which are not readily available. The majority of farmers were female with an average age of 45 years and had a family size of six people who provided family labor. Farmers spent 10 years in school, which means they are literate, allowing them to read and analyze agricultural information. Smallholder farmers had a farm size of 3 ha with an average of 13 years of farming experience. Smallholder maize farmers had access to agricultural extension services and farm organizations, which adopted modern technologies in their farms. The most used improved maize varieties were hybrid, followed by others and OPVs. Smallholder maize farmers were constrained by the high cost of seed variety, non-availability in local shops, lack of knowledge, the high cost of labor, and lack of finances.
In conclusion, female-headed farmers have a low advantage in adopting modern technology as they lack information and access to other agricultural resources. The study agrees with the hypothesis that the driving factors of adoption of improved maize varieties by smallholder maize farmers are socio-economic and institutional factors. Socioeconomic and institutional factors influenced the adoption rate of improved maize varieties (OPVs) in the study area. The study recommends that the government, NGOs, and extension agents must embark on educational training as a strategy to improve farmer awareness and knowledge of OPVs to farmers and increase adoption. The study further recommends that more efforts be made to advise farmers to have other sources of income, apart from their social securities from the government, such as small businesses, to overcome the issue of a lack of capital and increase their income. The formation of farm organizations should be encouraged to promote farmer–farmer extension services and knowledge sharing. The study further recommends that further research be conducted in other districts within the province, and this will assist in improving the adoption rate of improved maize varieties.