The production of humic acid fertilizer was once brilliant in China. In 1965, a certain army in Jilin built a nitro humic fertilizer plant to produce nitro humic acid from Shulan lignite, with stable quality and fertilizer efficiency, and an annual production capacity of 10,000 tons. Soon afterwards, the Zhangjiakou Fertilizer Plant, which used air oxidation method to oxidize lignite and ozone oxidation method to oxidize lignite in Pingzhuang Coal Mine, and the Datong Coal Chemical Experiment Plant, which directly ammoniated coal with ammonia and Datong weathered coal, appeared one after another. These industrially produced humic acid fertilizers are strictly monitored for quality and have obvious fertilizer effects, which are very popular among farmers.
In the face of this situation, the agricultural scientific research institutions and agricultural and forestry management departments at that time were skeptical and cautious about this because of the lack of management and standardization in the large-scale promotion and use of humic acid fertilizers. Where there are peat, lignite and weathered coal, they will produce their own manure. Others mix weathered coal and ammonium bicarbonate in a dry state and sell them as humic acid fertilizer. As you can imagine, the fertilizer effect is extremely unoptimistic. The reputation of humic acid fertilizers has been severely damaged.
Later, the leading departments of agriculture and forestry organized field experiments, research and investigations on the effects of humic acid fertilizers, and made a positive conclusion on the effects of humic acid fertilizers. In addition, it is estimated that from 1974 to 1980, the economic benefits of experimental promotion of humic acid fertilizers in my country reached 60 million yuan. Since then, a number of formal humic acid fertilizer production enterprises have been newly established in various places, and the production of humic acid fertilizer has gradually been on the right track.
One of the important effects of humic acid fertilizer on plants is growth stimulator. Using low-concentration humate solution sprayed on the leaf surface can stimulate growth, increase grain weight, and resist drought. Therefore, sprayed humic acid products have been promoted and consolidated.