Research Article

Effect of Biochar on Available Phosphorus Status in Alfisols Derived from Charnockite in Ekiti State, Nigeria

Ilori, A. O. A.,1*, Shittu, O. S.,1, Ayodele, O. J.1, Awe, G.O.1, Oso, A. O.1
1 Department of Soil Resources and Environmental Management, Ekiti State University, Ado-Ekiti, Ekiti State
* Corresponding author: iloriaoa@soilsjournalnigeria.com
Published: Apr, 2020
DOI: 10.67042/njss.2020.9z01n692
Pages: 8-14
Views: 514
Downloads: 684

Abstract

Biochar, a carbon-rich product of pyrolyzed biomass, has been used as an amend- ment to improve the properties of marginal highly-weathered soils in the tropics characterized by widespread phosphorus (P) deficiency. Alfisols derived from charnockite in Ekiti State are typically deficient in available phosphorus. Two alfisols from Ire-Ekiti and Ijan-Ekiti were amended with 0 (P-only), 5, 10 and 20% (w/w) biochars from maize stover (mB) and sawmill waste (sB) and incubat- ed for 56 days with the addition of 60 mg kg-1 P in solution and a control without biochar and P-solution. Incubated soils were sampled fortnightly and analyzed for available P using Mehlich III extractant, pH, and electrical conductivity (EC) in water (1:2 w/v). Results show that biochar increased the soil pH by 1-2 units and EC from the native 0.02 to 8.37 dS m-1 with mB at 10 and 20%, causing soil salinity (EC > four dS m-1). Biochar increased available P to values ranging from 9.96 to 376.22 mg kg-1 compared to 2.93 to 7.64 mg kg-1 in control and 5.42 to 40.13 mg kg-1 in P-only treatments. The available P increased with days of incu- bation up to day 42 and followed by a slight decline, but the P in biochar-treated soils was significantly higher than other treatments. The mB significantly im- proved soil properties (soil pH, EC, and available P status), particularly at higher rates more than sB. The 5% mB in which the problem of salinity problem associ- ated with higher rates is avoided should be recommended.

Keywords

and ec from the native 0.02 to 8.37 ds m-1 with mb at 10 and 20% causing soil

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How to Cite

A.,, I. A. O., S.,, S. O., J., A. O., G.O., A., & O., O. A. (2020). Effect of Biochar on Available Phosphorus Status in Alfisols Derived from Charnockite in Ekiti State, Nigeria. Nigerian Journal of Soil Science, 30(1), 8-14. https://doi.org/10.67042/njss.2020.9z01n692

I. A. O. A.,, S. O. S.,, A. O. J., A. G.O., and O. A. O., "Effect of Biochar on Available Phosphorus Status in Alfisols Derived from Charnockite in Ekiti State, Nigeria," Nigerian Journal of Soil Science, vol. 30, no. 1, pp. 8-14, April 2020. doi: 10.67042/njss.2020.9z01n692

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