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Application: Main Effect of Humic acid powder can improve soil which includes promote the formation of soil aggregates. Humic acid can promote the formation of soil aggregate structure, and the application of organic fertilizers to the soil can also improve the soil structure. This is mainly through the slow transformation of soil microorganisms. If humic acid fertilizers are frequently applied, this transformation process will be accelerated. And conducive to the regulation of water, fertilizer, air and heat conditions in the soil. When the soil aggregates become better, its bulk density decreases, porosity increases, and it has good permeability. The heat emitted when humic acid fertilizers are decomposed by microorganisms, especially in early spring when crop seedlings are just emerging, can increase the low temperature and play a role in resisting spring cold.