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Determination of phosphorus fractions in selected soils of southeastern Nigeria. – V. E. Osodeke and A. F. Ubah

November 28, 2020Journals Vol1. No1

ABSTRACT

The phosphorus fractions of soil samples from sixteen locations selected from southeastern Nigeria were determined. Available phosphorus was extracted by 2 methods (Bray – P-1 and Bray-P-2). Other forms of P were also determined. The results obtained indicated that total soil P varied from 125 to 750μgg-1 and organic P from 20 to 180μgg-1. The values of the active inorganic P forms for the various soils varied from 1.17 μgg-1 to 101.5 μgg-1 for Al-P, 3.5 μgg-1 to 189 μgg-1 for Fe-P and 1.5 μgg-1 to 4.7 μgg-1 for Ca-P. The relative abundance of the various inorganic P forms was in the order of inactive P>Fe-P>Al-P>Ca-P. Available P extracted by the two methods correlated significantly with Al-P and organic P. The higher correlation coefficient with Al-P showed that it contributes more to soil available P in these soils. In addition, the levels of phosphorus in these soils portray the need to understand the role played by the various forms of P in any phosphorus fertilization programme.

Keywords: Phosphorus fertilization, phosphorus fractions.

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