Effect of sheep manure on decreasing of phosphorus fixation in soils different in the content of calcium carbonate, and determination of Langmuir and Freundlich constants. مجلة للعلوم الزراعية [Internet]. 2021 Jun. 24 [cited 2026 Jun. 18];33(1). Available from: https://journal.damascusuniversity.edu.sy/index.php/agrj/article/view/111