Introduction of Humic Acid Fertilizer
Humic acid fertilizer, also as decay fertilizer, refers to organic fertilizers rich in humic acid and a certain amount of inorganic nutrients. This type of fertilizer is mainly composed of peat, lignite and weathered coal, and is treated with different amounts of inorganic fertilizer. Humic acid is a group of black or brown colloidal amorphous high molecular organic compounds containing carbon, hydrogen, oxygen, nitrogen, sulfur and the like. The inner surface of humic acid is large, and its adsorption force, cohesive force and colloidal dispersibility are good, and the cation exchange amount is large. The reactive groups in the humic acid structure, such as carboxyl groups, phenolic hydroxyl groups, etc., make them acidic, hydrophilic, and adsorptive, and can form a chelate with certain metal ions. The humic acid fertilizers mainly include ammonium humate, potassium humate, sodium humate and humic acid compound fertilizer. Humic acid is more resistant to microbial decomposition and is a slow-acting organic fertilizer.
The fertilizer efficiency of the fertilizer is related to the application rate. The amount of humic acid above 20% and the available nitrogen of more than 2.0% is generally 100-200 kg per MU(16.5-33kg/Acre). Can be used as base fertilizer or top dressing. Fertilization period should be early, generally using ditch or hole application, covering soil after application. Liquid fat can be used for soaking, rooting or foliar application.