Kathuli, PLN, LN Gachimbi, SW Maingiand, and EG Thuranira. “Suitability of Modified Dilute Double Acid ÐMehlich 1 (0.1NHCL + 0.025NH2SO4) and Olsen (0.5MNaHCO3PH 8.5) Methods for Testing of Available Phosphorous for Kenyan Soils”. Discovery and Innovation 19, no. 3 (February 16, 2009). Accessed August 30, 2026. https://www.ajol.info/index.php/dai/article/view/15802.