MAGHANGA , K. J.; KITUYI, L. J.; SEGOR, K. F.; KISINYO, . O. P. Soil Phosphorous Extraction by Olsen and Double Acid Methods in Acid Soils of Western Kenya. East African Journal of Pure and Applied Sciences, [S. l.], v. 2, n. 1, p. Pg 1–5, 2012. Disponível em: http://ojs.uoeld.ac.ke/index.php/eapas/article/view/239. Acesso em: 21 dec. 2024.