Comparative Analysis of Organic and Conventional Farming Soil Health Indicators

Thesis Abstract

The escalating demand for sustainable agricultural practices underscores the necessity to evaluate soil health comprehensively across different farming systems. This study aims to compare soil health indicators between organic and conventional farming systems to identify key differences and assess their implications for soil management and sustainability. The specific objectives include evaluating physical, chemical, and biological soil parameters, assessing the influence of farming practices on these indicators, and establishing correlations among soil health variables within the two systems. Employing a comparative cross-sectional research design, the study was conducted within three organic and three conventional farms located in the mid-altitude agricultural zone of the region, selected through stratified random sampling to ensure representativeness. The population comprised farmers practicing organic and conventional farming for at least five years, with a total sample size of 180 plots—90 from each farming system—sampled using a systematic random sampling approach to capture heterogeneity in soil properties. Data collection involved the use of standardized soil sampling protocols, followed by laboratory analyses for physical parameters (bulk density, porosity), chemical properties (pH, organic carbon, nitrogen, available phosphorus), and biological activity (soil microbial biomass, enzyme activities such as phosphatase and dehydrogenase). The reliability and validity of laboratory assays were established through calibration standards and repeatability measures. Data analysis employed descriptive statistics to summarize soil parameters; inferential statistics including t-tests and ANOVA to compare means between systems; and multiple regression analyses to examine relationships among soil variables. Theoretical frameworks guiding the study include the Soil Fertility Optimization Model and the Ecological Resilience Theory, which underpin the understanding of how farming practices influence soil health dynamics. It is anticipated that the findings will reveal significant differences in soil physical and biological indicators, with organic soils exhibiting higher microbial diversity, enzyme activities, and organic carbon content, indicative of enhanced biological activity and resilience. Chemical parameters are expected to show more stable pH and nutrient levels under organic systems, owing to organic amendments and reduced chemical inputs. These results will contribute novel insights into the sustainable management of soils under different farming regimes, filling existing gaps in empirical data on long-term impacts of organic versus conventional practices within the local context. The study’s main conclusion asserts that organic farming practices significantly improve soil biological and chemical health indicators compared to conventional methods, highlighting the importance of adopting organic practices for sustainable soil management. It recommends the promotion of organic amendments and reduced chemical inputs, as well as the integration of biological soil health monitoring into routine farm management. Furthermore, the study advocates for longitudinal research to track soil health dynamics over time and explore additional biological indicators such as soil microbiome diversity through molecular techniques. This research will inform policymakers, agricultural extension services, and farmers by providing evidence-based guidance on sustainable soil management strategies. Overall, the study advances understanding of the linkages between farming practices and soil health in the region, offering a scientific basis for ongoing efforts to transition toward more sustainable agriculture systems while preserving soil fertility and ecosystem services.