@article{MAKHILLERJ20093128284,
    title = {Fractional Recovery of Applied Phosphorus in Soils of Akwa Ibom State, Niger Delta Region of Nigeria},
    journal = {Environmental Research Journal},
    volume = {3},
    number = {1},
    pages = {1-3},
    year = {2009},
    issn = {1994-5396},
    doi = {erj.2009.1.3},
    url = {https://makhillpublications.co/view-article.php?issn=1994-5396&doi=erj.2009.1.3},
    author = {T.O. Ibia,E.J. Udo and},
    keywords = {Fractional recovery,phosphorus fixing capacity,fertilizer factor,bray P-1},
    abstract = {Seven surface soil samples, representing the dominant soil parent materials in Akwa Ibom State, Niger Delta Region of Nigeria were treated to various concentration levels of P and the amounts of P measured at time intervals of 1, 10, 50 and 150 days. The phosphorus fixing capacity of the soils increased with increasing rate of added P and time of equilibration. At 1 day, P fixation capacities estimated by fractional recovery varied from 26-66% and at 150 days observation it ranged from 37-76%, respectively for soils of sandstone and beach sands origin. The amount of P required to increase the value of Bray P-1 by 1 mg L<SUP>-1</SUP> (Fertilizer factor) at 150 days ranged from 2.6-5.3 mg L<SUP>-1</SUP> with a corresponding mean of 3.9 mg L<SUP>-1</SUP>. The fertilizer factor appears to provide a useful index of obtaining the P fertilizer needs of the soil, however, calibration and correlation studies in a wide range of soils could further the usefulness of this approach.}
    }