F. O, Umoh, Essien O. A, Ijah C. J, and Sunday A. E. 2021. “Determination of Phosphorous Fixation Capacity on Alluvium, Sandstone and Shale Soils of Akwa Ibom State, Nigeria”. International Journal of Sustainable Agricultural Research 8 (2):105-13. https://doi.org/10.18488/journal.70.2021.82.105.113.