Citric Acid (CA)–Modified Biochar Improved Available Phosphorus Concentration and Its Half-Life in a P-Fertilized Calcareous Sandy Soil - Adil Mihoub; Abu El-Eyuoon Abu Zied Amin; Hamid Reza Motaghian; Muhammad Farhan Saeed; Asif Naeem (Journal of Soil Science and Plant Nutrition, 2022)