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 Jun. 6];3(14). Available from: https://journal.hama-univ.edu.sy/huj/article/view/485