Evaluation of Phosphorus Extraction Efficiency from Soils Using Iron-Aluminum Impregnated Paper, Bray P-1, Mehlich-1, and Hunter Methods

Abstract

This study aimed to investigate and compare the phosphorus (P) extracted using four extraction methods (Bray-1, Mehlich-1, Hunter, and Fe/Al-Pi extraction methods). For this purpose, the authors analyzed P in a field experiment at the Federal University of Agriculture, Abeokuta conducted over a twelve-week period in the wet season. Analysis for available P was conducted on soil samples at 0, 4, 8, and 12 weeks after beddings (WAB). Data collected were subjected to regression analyses and analysis of variance (ANOVA); Duncan's Multiple Range Test separated significant means at 5% probability levels. Study findings demonstrate the effects of using different extractants. The highest amount of soil-extracted P was linked to the Mehlich-1 solution, followed by the Hunter solution, the Bray-1 solution, and Fe/Al-Pi. Significantly positive regression (p<0.001) relationships were established amongst chemical extractants and ion-sink methods. The strongest relationship was found between Fe/Al-Pi and Bray-1 (R2= 0.82). In conclusion, the Fe/Al-Pi ion-sink method provides a dependable alternative to Bray-1 for estimating P availability and assessing the phosphorus status of southwestern Nigerian soils.

Keywords

• Physicochemical properties
• ion-sink methods
• available phosphorus
• regression analyses
• Southwestern Nigerian soils
• weeks after beddings

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