The Comparing of Olsen and Joret-Hebert methods for extraction of available phosphorus in soil different in the content of calcium carbonate, and determination optimum shake time. مجلة الجامعة [Internet]. 2021 Jan. 26 [cited 2026 Apr. 25];3(14). Available from: https://hama-univ.edu.sy/ojs/index.php/huj/article/view/485