Nitrogen Cycling and its Dynamics in Soil-Plant Systems, Future Perspective and Research Directions: A Comprehensive Review

Abstract

Nitrogen is an important macronutrient that is essential for plant growth, soil fertility and agricultural productivity. It plays a crucial role in many physiological processes including protein synthesis, photosynthesis and overall plant metabolisms. However, in agricultural systems nitrogen availability is greatly influenced by complex biogeochemical processes such as nitrogen fixation, mineralization, nitrification and denitrification that depends on microbial activity and environmental conditions. Overuse of fertilizers is a major nitrogen mismanagement practice leading to environmental problems like greenhouse gases emissions, groundwater pollution and also deteriorate soil health. This study aims to provide a comprehensive review of nitrogen dynamics in soil-plant systems, focusing on the processes regulating nitrogen availability and uptake. It explores the role of soil properties, microbial interactions and various agronomic practices in the nitrogen cycle that highlights the environmental impacts of nitrogen losses and will provide strategies to improve nitrogen use efficiency (NUE). Furthermore, it discusses sustainable management practices including the use of nitrogen-fixing crops, precision agriculture and encourage the use of some emerging techniques such as use of nano-fertilizers, microbial inoculants, AI driven- nitrogen application and carbon based nitrogen stabilizers to enhance the crop productivity while minimizing environmental degradation.