Yellow humic acid is a short-carbon chain molecular structure substance extracted from natural humic acid. It has a high load capacity and physiological activity. Applied in agriculture and horticulture industry, it has the following benefits: chelating constant and micronutrients for better utilization of plants; enhancing waterlogging resistance to plant diseases; stimulating plant microbiological activity; sustainably releasing fertilizers to improve the utilization of chemical fertilizers and pesticides; improving nutrient absorption, promoting plant germination and growth; accelerating precipitation decomposition and improving soil structure. 1. Improve the soil agglomerate structure, loosen the soil, improve the water and fertilizer retention capacity of the soil, adjust the PH value, reduce the content of heavy metals in the soil, and reduce the harm of salt ions to seeds and seedlings. 2. Nitrogen fixation, phosphorylolysis, and potassium activation. In particular, the effect of potash fertilizer is particularly obvious, and it plays the role of increasing roots and strengthening seedlings, resisting heavy stubble, resisting diseases, and improving crop quality. 3. Strengthen the adhesion and rapid absorption capacity of plant roots, especially have obvious effects on physiological diseases caused by lack of trace elements