Kituyi , Lusweti, and Alwala Joseck Olukusi. “ Sorption and Availability of Potassium in Selected Soils from Western Kenya ”. African Journal of Education,Science and Technology (AJEST) 2, no. 3 (February 26, 2015): Pg 168–180. Accessed April 3, 2026. http://ajest.org/index.php/ajest/article/view/629.