Summary
Phosphorus (P) is one of the largest nutrients limiting crop productivity. Meanwhile, P deficiency is a common phenomenon in agricultural soils around the world. Humic substances, as macromolecular polymer, accelerate and strengthen process which transforms P into bio-available forms via a range of chemical reactions and biological interactions. There is now an urgent need to comprehend the work carried out on the interaction among humic substances, soil and plant to better understand their role in the transformation and promotion of soil bioavailable P for plant growth. Herein, we discuss the factors and mechanisms of humic substances influencing P cycling in soil-plant systems, which focus on their contribution to soil P mobilization and plant P acquisition. This review covers how humic
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