What is the difference between fulvic acid potassium and humic acid potassium?

Compared with potassium humate, the molecular weight of potassium fulvate is generally between 300 and 500, and the molecular weight of potassium humate ranges from hundreds of thousands to millions. In other words, potassium fulvate can be directly decomposed and utilized by crops after it is applied to the soil, while potassium humate can only be absorbed and utilized by crops through the decomposition and transformation of microorganisms in the soil.