Effect of biochar on the physicochemical properties and nitrogen transport of podzolic soil in a boreal ecosystem

Saha, Ratnajit (2020) Effect of biochar on the physicochemical properties and nitrogen transport of podzolic soil in a boreal ecosystem. Masters thesis, Memorial University of Newfoundland.

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Abstract

This study is aimed at investigating the effects of biochar on the physicochemical properties and nitrogen transport in podzolic soils. Soil samples were collected from a research site in Pasadena, Newfoundland, Canada. Experimental treatments consisted of three types of soils {top, E-horizon and mixed soil (topsoil 2: E-horizon soil 1)}, two biochar types (granular and powder) and four biochar application rates (0%, 0.5%, 1% and 2% on a weight basis). A total of 210 most relevant and latest research articles were reviewed. Ten important physicochemical parameters of soil were investigated through a total of 72 experimental units and 54 leaching column experiments. Metadata analysis showed that only a few studies were conducted on the boreal podzolic soil. Soil porosity, field capacity and plant available water increased by 2.8%, 10%, and 12.9%, respectively compared to control when the soil was treated with powdered biochar. Nitrate leaching was reduced by 36% compared to control soil. Granular and powdered biochar were found to be hydrophobic and hydrophilic, respectively. A 2% biochar application rate showed greater impact in terms of improving hydraulic properties and reducing nitrogen leaching. The findings would be helpful to improve agricultural practices in the boreal podzolic soil.

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