Assessing the Impact of Biofertilizers on Maize Yield in Southern Corn Growers Cooperative

Thesis Abstract

This study investigates the efficacy of biofertilizers in enhancing maize yield among members of the Southern Corn Growers Cooperative, addressing the ongoing challenge of maintaining high crop productivity sustainably amid declining soil fertility and environmental concerns associated with conventional chemical fertilizers. The primary aim is to assess the impact of biofertilizer application on maize production, with specific objectives to evaluate crop performance metrics, examine farmers’ perceptions and adoption levels, analyze the cost-effectiveness of biofertilizer use, and identify factors influencing adoption rates within the cooperative. Employing a mixed-method research design, the study integrates quantitative and qualitative approaches to provide a comprehensive understanding of biofertilizer impacts. The quantitative component adopts an experimental field trial conducted over two consecutive planting seasons, involving a sample of 150 maize farmers selected through stratified random sampling from the 300 registered members of the cooperative. Participants are divided into treatment and control groups, with the treatment group applying a locally formulated biofertilizer containing Rhizobium and Azospirillum strains, while the control group continues conventional fertilization practices. Data collection instruments comprise structured questionnaires for farmers, measuring yield parameters, input costs, and perceptions; and field measurement tools for crop growth and yield data. The qualitative component involves focus group discussions and in-depth interviews with 30 farmers and cooperative managers to explore perceptions, barriers, and motivators related to biofertilizer adoption. Data analysis employs descriptive statistics such as mean, standard deviation, and frequency distributions to profile respondents and summarize data. Inferential techniques include Analysis of Variance (ANOVA) to compare maize yields between treatment and control groups, multiple regression analysis to determine factors influencing yield and adoption, and thematic analysis for qualitative data to interpret perceptions and behavioral factors. The study also applies the Technology Acceptance Model (TAM) to understand farmers’ perceptions and willingness to adopt biofertilizers, complemented by the Diffusion of Innovations Theory to interpret adoption patterns over time. Expected findings suggest that application of biofertilizers significantly increases maize yield by an average of 18% compared to conventional practices, while also reducing input costs and environmental impact. Farmers with prior awareness and positive perceptions of biofertilizers exhibit higher adoption rates, influenced by factors such as perceived ease of use, relative advantage, and support from cooperative extension services. The study also anticipates identifying key barriers such as limited access to biofertilizer formulations, skepticism about efficacy, and lack of technical knowledge. This research contributes to knowledge by providing empirical evidence on the agronomic benefits and socio-economic impacts of biofertilizer use within smallholder maize production systems, thus addressing existing literature gaps regarding contextual adoption factors in cooperative settings. It highlights the potential for biofertilizers to enhance sustainable intensification and supports policy recommendations centered on strengthening extension services, ensuring biofertilizer accessibility, and fostering favorable perceptions among farmers. The study concludes that integrating biofertilizers into maize cultivation practices within the Southern Corn Growers Cooperative offers a viable pathway toward sustainable productivity improvement. Recommendations include scaling up biofertilizer dissemination programs, capacity building for farmers, and incentivizing adoption through subsidy schemes. Further research is suggested to explore long-term impacts and scalability across broader agro-ecological zones. Overall, this thesis affirms that biofertilizers substantially contribute to increased maize yields and environmental sustainability, thereby informing agricultural policies and cooperative management strategies aimed at ecosystem-friendly intensification.