Physiologically, the effects and functions of humic acid on plants
(1) Strengthening respiration
Some people call humic acid “respiratory fertilizer”. It is generally believed that because humic acid molecules contain phenols and quinones, which can be converted into each other, it can be both a hydrogen carrier and an oxygen activator, forming a redox system that can transfer electrons and promote respiration.
(2) Promoting the absorption and transportation of mineral elements
Humic acid can form complexes or chelates with multivalent metal ions through the oxygen-containing functional groups on its molecular side chains. This form can activate various metal elements in the soil, especially trace elements, and change them from unusable to usable states, making them easier for plants to absorb and transport.
(3) It can increase the chlorophyll content in leaves
This is a very intuitive effect. All crops that use humus fertilizer can clearly see that the crops are greener. Due to the increase in chlorophyll, the photosynthesis of plants is naturally improved, and more carbohydrates can be synthesized.
(4) Regulate water metabolism
The most obvious is that after applying humic acid, the stomata on the leaves become smaller, reducing water evaporation and having a drought resistance effect.
(5) It can promote the metabolism of sugars, nucleic acids and proteins
The application of humic acid can improve the quality of crops. For example, there are many reports on tobacco leaves, vegetables, fruits, etc.
(6) It has growth regulation or plant hormone-like effects, the most obvious of which is to promote rooting, keep green, and prevent aging.