Assessment of Microbial Diversity in Agricultural Soils Using Next-Generation Sequencing Technology

Thesis Abstract

Abstract
The assessment of microbial diversity in agricultural soils is crucial for understanding the complex interactions that drive soil health and productivity. Next-generation sequencing (NGS) technology has revolutionized the study of microbial communities by providing a high-throughput and cost-effective approach to characterizing the diversity and composition of soil microbiomes. This thesis presents a comprehensive investigation into the microbial diversity of agricultural soils using NGS technology, with a focus on understanding the relationships between soil microbial communities and key soil properties. Chapter One provides an introduction to the research topic, outlining the background of the study, problem statement, objectives, limitations, scope, significance, structure of the thesis, and definition of key terms. The literature review in Chapter Two critically examines existing studies on microbial diversity in agricultural soils, highlighting the importance of understanding soil microbiomes for sustainable agriculture. Chapter Three details the research methodology, including sample collection and processing, DNA extraction, library preparation for NGS, sequencing, bioinformatics analysis, and statistical methods employed to analyze the data. The discussion of findings in Chapter Four presents a detailed analysis of the microbial diversity observed in different agricultural soils, with a focus on the impact of soil management practices on microbial community composition. The results reveal significant differences in microbial diversity between conventional and organic farming systems, with organic soils showing higher microbial richness and diversity. Additionally, specific microbial taxa associated with soil health indicators such as nutrient cycling and disease suppression were identified. The implications of these findings for sustainable soil management practices are discussed, highlighting the importance of promoting microbial diversity for enhancing soil fertility and productivity. In the concluding Chapter Five, the key findings of the study are summarized, and recommendations for future research and practical implications for soil management are discussed. This thesis contributes to the growing body of knowledge on microbial diversity in agricultural soils and underscores the importance of incorporating NGS technology into soil health assessments for sustainable agriculture practices. Keywords microbial diversity, agricultural soils, next-generation sequencing, soil microbiome, sustainable agriculture, soil health, soil management.