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humic acid fertilizer is a new type of fertilizer based on humus. humic acid is a kind of organic colloid, dark brown, large inner surface and colloidal surface area, strong adsorption, soil construction, improving soil aggregate structure and increasing crop yield. improved fertilizer: first, humic acid is a chelating organic acid. the adsorption, exchange and activation of soil in phosphorus, potassium, calcium, magnesium and other mineral elements greatly improve the efficiency, thus improving the utilization rate of fertilizer. at the same time, it can reduce the ammonia volatilization loss of nitrogen fertilizer and make it become slow-release fertilizer, so as to improve the utilization rate of nitrogen fertilizer. humic acid, potassium fertilizer and potassium ion can decrease with the loss of water, improve their utilization rate, promote crop root growth, increase the absorption of nutrient elements, so as to increase crop yield and improve crop disease resistance.