Humic acid combination and application thereof

The invention relates to the field of fertilizers, in particular to a humic acid combination and application thereof. The humic acid combination is prepared from fulvic acid, ulmic acid and humic acid, wherein the fulvic acid accounts for 64 to 98 percent by weight, preferably 81 to 98 percent by weight, and more preferably 85 to 98 percent by weight of the total mass of the fulvic acid, the ulmic acid and the humic acid; the content of a phenolic hydroxyl group in total humic acid is 0.76 to 2.42mmol/g. In the humic acid combination, the content of the fulvic acid which has a small molecular weight and high active functional group content is high, and the content of the active phenolic hydroxyl group is high, so that a remarkable effect on promotion of seed germination is achieved; by adopting the humic acid combination, an organic energy source can be directly provided for soil microorganisms, the propagation of the microorganisms can be promoted and the decay rate of soil microorganisms can be lowered by improving the nutrition and rhizosphere soil environment of crop plants, and the soil microorganisms can keep vigorous life activities for a long time, so that the growth and development of the crops are promoted.