How Does Humic Acid Improve Plant Growth?
As mentioned above, one way plant growth is improved is through the structural improvement of both clay and sandy soil allowing for better root growth development.
Plant growth is also improved by the ability of the plant to uptake and receive more nutrients. Humic acid is especially beneficial in freeing up nutrients in the soil so that they are made available to the plant as needed. For instance if an aluminum molecule is binded with a phosphorus one, humic acid detaches them making the phosphorus available for the plant. Humic acid is also especially important because of its ability to chelate micronutrients increasing their bio-availability.
How Does Humic Acid Effect Microbial Activity and What is its Role?
The activities of beneficial soil microbes are crucial for the sustainability of any soil and plant growth. Humic acid stimulates microbial activity by providing the indigenous microbes with a carbon source for food, thus encouraging their growth and activity. Soil microbes are responsible for solubilizing vital nutrients such as phosphorus that can then be absorbed by the humic acid and in turn made available to the plant. Additionally, microbes are responsible for the continued development of humus in the soil as it continues to break down not fully decomposed organic matter. This in-situ production of humus continues to naturally add to the humic acid base and its benefits.
Humic Acid’s Role in Fertilization
Humic acid is technically not a fertilizer, although in some walks people do consider it that. Humic acid is an effective agent to use as a complement to synthetic or organic fertilizers. In many instances, regular humic acid use will reduce the need for fertilization due to the soil’s and plant’s ability to make better use of it. In some occurrences, fertilization can be eliminated entirely if sufficient organic material is present and the soil can become self sustaining through microbial processes and humus production.
Microorganism and organic matter
As all know humic substance is main fraction of soil organic matter,is results of humification of decaying plants body and leaves,humification is process of bioactivity of microorganism.
Main organism are protozoa, fungi, bacteria, arthropods, and beneficial nematodes,their working are decompose dead leaves and plants,extract nutrients and carbon,provide plants microelement like NPK in the form of plants usable.Thus microorganism is important to the soil fertility.
There is some test report in northeast China showed that more OM content will find more microorganism biomass.
In the present time a lot farming area using chemical fertilizer,they need to be converted into the form of plants usable, during the process they will interrupt the structure of soil organic matter,then the soil organic matter is gradually going less.In return the soil microorganism is relatively decreased ,as their live condition is changed.