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What kinds of humic acid fertilizers
With humic acid-rich peat, lignite, weathered coal as raw materials, through amination, nitrification and other chemical treatment, or add nitrogen, phosphorus, potassium and trace elements made of a class of fertilizers, known as humic acid fertilizers. It has many functions such as improving the physical and chemical properties of soil, increasing the utilization rate of chemical fertilizers, stimulating the growth and development of crops, enhancing the stress resistance of crops, and improving the quality of agricultural products. At present, there are mainly the following categories: humic acids, nitrohumic acids, and purified humic acids. The former two are mostly made up of nitrogen, phosphorus, potassium and trace elements into compound units or multiple humic acid compound fertilizers, and the purified humic acids are mainly made of water-soluble potassium, sodium and ammonium salts for watering or spraying. On crops, it is used as a growth regulator. Humic acid or nitro fulvic acid compound fertilizer is mainly used as basal fertilizer and is applied in a centralized manner (experimental application or acupoint application). According to the content of humic acid and nutrients, 50 kg per acre is applied. Dissolved humates, the most widely used are foliar spray, can increase chlorophyll content, restore root vigor, promote nutrient transfer to fruits and seeds, and improve the quality of agricultural products. Spraying concentration of 0.01%-0.05%, spraying 50 kg per acre, spraying time from booting to flowering, or early grouting is good, to reduce the empty crop rate of cereal crops, to increase the weight of 1000 grain is good. Fruit trees are sprayed during young fruit formation to reduce fruit drop, increase yield, and improve quality.