Humic acid is a mixture of natural organic macromolecular matters, it had good effect on improving soil condition, increasing plant resistance ability to stress.

1. The Role Of Humic Acid In Agriculture
Humic acid is a mixture of natural organic macromolecular compounds, which exists in all soils,
plants and animals,and have been widely used in agricultural production in recent years due to
their unique physiological functions.
Adding a small amount of humus to an acre of soil can achieve positive results.
Features of using Humic acid:
A. Improved structure of soil,prevents high water and nutrient losses in light, sandy soils.
B. Regulates the pH-value of soils.
C. Enhances plant’s nature resistance against diseases and pests.
D. Stimulates root growth,and improves the uptake of nutrients and water by plants.
What’s more,In addition to these above benefits,its role in plant stress resistance has also
received increasing attention.
A. Plant drought stress：
Under drought conditions, the application of humic acid-containing fertilizer can promote the
increase of proline content in plant leaves to improve the drought resistance of crops.

2. B. Plant salt and alkali stress：
Humic acid can enhance the salt resistance by regulating the change of fructose concentration
and alleviating the damage of material membrane under salt stress.
C. Plant temperature stress：
Under low temperature stress, humic acid can increase crops’s proline and abscisic acid content、
reduce the spead of transpiration rate, stomatal conductance and net photosynthetic rate of
plants.
Under high temperature stress, It enhances the heat resistance of crops by increasing the
activities of crop superoxide dismutase and peroxidase.
D. Plant disease resistance：

3. Humic acid can promote growth by increasing the sugar content and chlorophyll content of leaves,
which indirectly improves the disease resistance of crops.
In fact,crops are constantly undergoing the test of the natural environment、pests and diseases,
the use of humic acid will greatly benefit their growth.
Humic Acids Application：
The humic acid powder can be applied dry, but it is more commonly mixed with water in a
watering can, sprayer, or irrigation system.
The liquid humic acids are ready to use after dilution.
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