Ouda, M. and Naser, K. 2026. EFFECT OF HUMIC ACID ON THE ADSORPTION OF ZINC AND BORON IN CALCAREOUS SOIL AND GROWTH AND YIELD OF SUNFLOWER. IRAQI JOURNAL OF AGRICULTURAL SCIENCES. 57, 3 (Mar. 2026), 797–811. DOI:https://doi.org/10.36103/t8a1wn65.