ew Journal of Soil and Water Science Open Access | Page 236 | Vol 6 | Issue 1 | Pages 236-243 ISSN: 2643-5799 Copyright: © 2022 Tate JO, et al. This is an open-access artcle distributed under the terms of the Creatve Commons Atributon License, which permits unrestricted use, distributon, and reproducton in any medium, provided the original author and source are credited. DOI: 10.36959/624/450 *Corresponding author: Kelvin Harrison Diri, Department of Crop and Soil science, Faculty of Agriculture, Niger Delta Uni- versity, Wilberforce Island, P.M.B 071, Yenagoa, Bayelsa State, Nigeria, Tel: +2348137967515 Accepted: March 07, 2022 Published online: March 09, 2022 Citaton: Tate JO, Dickson AA, Diri KH (2022) Infuence of Local- ly Pyrolysed Wood and Catle Dung Biochar on Macronutrients Distributon and Heavy Metal Toxicity in Diesel Contaminated Soils. J Soil Water Sci 6(1):236-243 SCHOLARS. DIRECT Infuence of Locally Pyrolysed Wood and Cattle Dung Biochar on Macronutrients Distribution and Heavy Metal Toxicity in Diesel Contaminated Soils Joseph O Tate 1 iD , Achimota A Dickson1 and Kelvin Harrison Diri 1* iD Department of Crop and Soil Science, Faculty of Agriculture, Niger Delta University, Wilberforce Island, Nigeria Research Article Abstract A greenhouse study was conducted to assess the infuence of locally pyrolysed feedstock in the mineralizaton of Potassium (K), Phosphorus (P) and Magnesium (Mg) and toxicity of Cadmium (Cd) and Nickel (Ni) heavy metals in soil. Separate amendments of Wood char (WC), Catle dung (CD) and a combinaton of both Wood and Catle dung (WCD) chars weighed at 150 g (W 1 ), 300 g (W 2 ) and 450 g (W 3 ) were assessed for physico-chemical characteristcs of incorporated soils contaminated with diesel fuel. Results showed signifcant infuence of the amendments with highest mean concentratons of 7.5 ± 0.36 in WCD (W 2 ), 6.25 ± 0.13 mg kg -1 in WCD (W 3 ), 12.42 ± 0.28 mg kg -1 in CD (W 2 ), 122.11 ± 2.71 cmol kg -1 in CD (W 3 ) and 140.81 ± 34.01 cmol kg -1 in WCD (W 3 ) soils for pH, organic mater, available P and exchangeable Mg and K respectvely. Heavy metals concentraton was highest at 0.12 ± 0.01 mg kg -1 in WCD (W 3 ) and 0.68 ± 0.34 mg kg -1 in CD (W 2 ) for cadmium and nickel, respectvely. These results indicated that CD and WCD were most efectve in turning acidic soils basic, infuencing carbon sink, increasing organic mater content, mobilizing P, and mineralizing Mg and K while immobilizing Cd and Ni. Correlaton analysis showed that locally pyrolysed biochars of CD and WCD possess potental of turning diesel contaminated soils suitable for agricultural use. It was therefore recommended that local farmers can adopt earthen kiln method for pyrolysing feedstock and turn into amendments for contaminated soils. Keywords Local pyrolysis, Amendment, Biochar, Catle dung char, Wood char Check for updates statons are situated and operated as well as at fash points of major oil spillage. The resultant efects of these forms of environmental hazards are mostly felt by rural dwellers and farmers as there are inadequacies in response and management of such problems. Carbon-rich char produced from pyrolytc processes makes materials from biological sources highly recalcitrant [4], thereby possessing great potental for improving agronomic producton when applied to soils as an amendment [5]. The applicaton of such “biochar” materials has, however, Introduction The challenges of agricultural soils being contaminated with crude oil or industrial and domestc wastes are becoming more exacerbatng. These contaminants have the capacity to penetrate soils beyond plant root depth of 20-30 cm and contaminate underlying ground water. They are known to play signifcant roles in agricultural productvity that can result to the loss of fertlity, biodiversity and further promote environmental degradaton. The widespread problem of an escalatng human populaton growth with diminishing food security and climate change efects (carbon abatement) have been identfed as contributng factors in recent tmes [1]. The exposure of arable lands to hydrocarbon efuents either accidentally or intentonally has further widened the gap in solving such global problems especially at the rural level. Massive industrializaton and urbanizaton have become viable channels through which saturated hydrocarbons like diesel fuels and other substances with similar carcinogenic propertes are spilled into soils with litle applicable means of control [2]. These substances possess health risk propertes that can reach up to 11% of the diesel volume [2,3]; and are mostly found in areas where automobile workshops or flling