Profile: Xian Tbio Crop Science Co.,Ltd specializes in providing organic fertilizers. Humic substances are involved in many processes in soils and natural waters such as soil weathering, plant nutrition, pH buffering, trace metal mobility & toxicity, bioavailability, degradation, transport of hydrophobic organic chemicals, formation of disinfection by-products during water treatment, & heterotrophic production in blackwater ecosystems. Humic acid is a high polymer heterogeneous aromatic hydroxy carboxylic acid. It is a black or brown powder or granular. It is insoluble in water and is of weak acidity. It comprises hydroxy, carboxylic, phenolic hydroxyl and other active groups.