Comparative Analysis of Organic and Conventional Farming Impacts on Soil Health

Thesis Abstract

This study addresses the critical issue of soil degradation and the sustainability of agricultural practices by comparing the impacts of organic and conventional farming systems on soil health. As global concerns about soil fertility decline and environmental sustainability intensify, understanding the differential effects of these farming paradigms becomes essential for informing sustainable agricultural policies and practices. The primary aim of the research is to systematically evaluate and compare soil health indicators—such as organic matter content, microbial biomass, nutrient availability, pH, and soil structure—in organic versus conventional farming systems. The study also seeks to identify the key agronomic and environmental factors influencing soil quality within these systems, contributing to a deeper understanding of sustainable soil management. To achieve these objectives, a comparative cross-sectional research design was adopted. The study population comprised 60 farms—30 practicing organic farming and 30 practicing conventional farming—within a peri-urban agricultural zone characterized by diverse cropping systems. A stratified random sampling technique was employed to select farms ensuring representativeness across crop types and farm sizes. Data collection involved both field-based sampling and laboratory analyses. Soil samples were collected from each farm at a depth of 0–20 cm during the peak growing season, with five composite samples per farm, totaling 300 samples. The study utilized standardized soil analysis techniques, including loss-on-ignition for organic matter, phospholipid fatty acid (PLFA) analysis for microbial biomass, spectrophotometric methods for nutrient levels, and pH meters for soil acidity. Complementary farmer surveys gathered data on management practices, input use, and crop rotation patterns. Data analysis employed a combination of descriptive statistics, Analysis of Variance (ANOVA), and multiple regression models to determine statistically significant differences and relationships between farming system types and soil health indicators. Structural Equation Modeling (SEM) was used to explore the causal pathways linking management practices to soil quality outcomes. Thematic analysis of qualitative survey responses provided contextual insights into farmers' perceptions and management strategies. The study also grounded its theoretical framework on the Soil Fertility and Ecosystem Services Theory and the Sustainable Agriculture Paradigm, facilitating a comprehensive understanding of the biophysical and socio-economic dimensions influencing soil health. Anticipated findings suggest that organic farming systems will exhibit significantly higher levels of soil organic matter, microbial biomass, and nutrient availability, along with better soil structure and higher pH stability, compared to conventional systems. Conversely, conventional systems are expected to show increased levels of synthetic chemical residues and reduced microbial diversity. These differential impacts may be attributable to practices such as organic amendments, crop rotations, and reduced chemical inputs in organic farms. The results are expected to demonstrate that sustainable soil management practices inherent in organic systems substantially improve soil biological activity and nutrient cycling, thus promoting long-term soil fertility. This research contributes new empirical evidence to the ongoing debate on sustainable agriculture by providing a comprehensive, scientifically validated comparison of soil health under organic and conventional practices in a specific agro-ecological context. The findings will inform policymakers, extension agents, and farmers on best practices for soil conservation and management, emphasizing the ecological and economic benefits of adopting organic methods where feasible. Furthermore, the study offers a methodological blueprint for future comparative assessments of soil health in diverse farming systems. In conclusion, the study underscores the superior capacity of organic farming to enhance soil health and resilience, advocating for integrated management approaches that combine organic principles with innovative conventional practices to optimize soil sustainability. Recommendations include policy incentives for organic farming adoption, farmer education on soil conservation techniques, and further longitudinal research to examine long-term soil health trajectories beyond the cross-sectional scope. The findings serve as a vital contribution toward the development of sustainable, resilient agricultural systems aligned with environmental conservation and food security objectives.