PINE BARK COMPOST AS BIOFILTER: ENHANCING DENITRIFICATION AND REDUCING NITROGEN LEACHING IN SOIL.

Abstract

Nitrogen leaching from agricultural soils is a major environmental issue that contributes to groundwater contamination, eutrophication, and greenhouse gas emissions. Excess nitrate (NO₃⁻) in soil is highly mobile and can easily move beyond the root zone into water bodies. Recent research has focused on sustainable and low-cost biofiltration materials capable of improving denitrification and reducing nitrate losses. Pine bark compost (PBC), an organic by-product rich in carbon and lignocellulosic compounds, has emerged as an effective biofilter material due to its porous structure, high organic matter content, and ability to support microbial activity. This review examines the role of pine bark compost in enhancing biological denitrification and minimizing nitrogen leaching in soil systems. The paper discusses denitrification mechanisms, physicochemical properties of pine bark compost, microbial interactions, nitrate adsorption, and the influence of environmental factors such as moisture, pH, temperature, and carbon-to-nitrogen ratio. Studies have demonstrated that pine bark-based systems significantly improve nitrate removal efficiency and provide a sustainable alternative to synthetic carbon sources in denitrification processes. The review further highlights experimental methodologies, environmental benefits, limitations, and future research directions associated with the use of pine bark compost as a biofilter in agricultural and environmental management systems.