The functions of humic acid compound fertilizer in improving crops and their growth environment are mainly as follows:
(1) Improve soil, adjust soil salinity, and increase soil aggregate structure, especially for improving saline-alkali land.
(2) It has obvious nitrogen fixation, phosphorus dissolution and potassium slow release. It reduces nitrogen volatilization loss, converts phosphorus in soil or phosphate fertilizer into soluble phosphorus, reduces soil absorption and fixation of potassium, and improves the recovery rate of quick-acting potassium. It can also chelate trace elements in the soil.
(3) Stimulate crop growth and development, make crops take root quickly, have more secondary roots, increase root volume, elongate root system, promote effective tillering, and enhance photosynthesis and respiration intensity.
(4) Enhance crop resistance to stress, drought resistance, cold resistance, dry hot wind resistance, and lodging resistance.
(5) Defend against crop diseases and insect pests, and have unique effects on disease prevention and control, and the effect is more obvious when used in combination with pesticides. It has special functions for crop diseases caused by fungi, such as wheat smut, corn anthracnose, cotton wilt, fruit tree powdery mildew, etc.
(6) Improve crop quality, increase the sugar content of fruits and vegetables, reduce the acidity of fruits, and increase low-molecular organic nutrients in grains.