AbdulSayed, Ola D., and Hayfaa J.H. Al-Tameemi. 2019. “Efficiency of Prepared Chelate Fertilizer From Humic Acid in Reducing Ammonia Volatilization From Urea Fertilizer”. Basrah Journal of Agricultural Sciences 32 (November):231-45. https://doi.org/10.37077/25200860.2019.271.