Generally speaking, the stimulating effect of mineral humic acid on plant root growth is related to the concentration, degree of polymerization, molecular weight and type of plants affected by mineral humic acid.
1. Concentration of mineral humic acid
Researchers applied different concentrations of mineral-source humic acid to the rice roots and found that the rice roots produced a certain amount of activity after applying an appropriate concentration of mineral-source humic acid, which promoted the growth of rice and the formation of lateral roots. However, the application of high concentrations of mineral humic acid increases the content of reactive oxygen species, leading to lipid peroxidation and adversely affecting the growth of rice roots.
2. The degree of polymerization and molecular weight of mineral humic acid
Studies have shown that humic acid from mineral sources with low polymerization degree and small molecular weight has high activity, which can stimulate the activity of H+-ATPase in corn root plasma membrane and the growth of corn root system, and promote the area of corn root zone. Large molecular weight mineral sources with high polymerization degree are Twice that of humic acid; while humic acid from mineral sources with high degree of polymerization and large molecular weight has a stronger stimulating effect on tonoplast H+ pump, corn root growth and H+-ATPase activity in corn root microsomes than mineral sources with low polymerization degree and small molecular weight. Humic acid.
3. Plant species affected by mineral humic acid
The same mineral source of humic acid has different effects on different plants. When mineral humic acid and its graded substances act on Arabidopsis thaliana seedlings, the root system exhibits reactions similar to those stimulated by the addition of large amounts of exogenous auxin, such as shortening of the main root and inducing lateral root growth; however, when acting on corn seedlings, the root system exhibits Both the main root and lateral roots have growth effects similar to those stimulated by adding low doses of exogenous auxin.
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