Effects of potassium humate on soil
The Hydroxyl groups and carboxyl groups in potassium humate react easily with calcium ions in soil. Then form the aggregate structure of soil through the physiological action of plant roots.
When the aggregate structure of soil becomes better, the bulk density decreases and the voidage increases. So it has good permeability. Because the color of potassium humate is dark, it is beneficial to the absorption of solar heat energy. When humic acid is decomposed by microorganisms, it releases heat. Especially when crop seedlings are unearthed in early spring season, it can increase ground temperature and play a role in resistance to spring cold.
It has been found that direct application of leonardite and corn straw can improve the structural properties of soil. Especially for the formation of aggregate structure in the range of 0.25mm~1mm. Because potassium humate is a macromolecular acid substance. It can reduce the pH of saline-alkali soil and reduce the exchange sodium ion through the neutralization and exchange of acid and alkali. So as to achieve the effect of treating saline-alkali soil.
The experimental results show that the application of leonardite raw powder(humic acid powder), which accounts for 10% of soil quality, can reduce the pH of soil from 9.0 to 8.0. Reseachs show that leonardite can improve the nutrient supply of saline-alkali soil. Increase the root activity of rice. Promote the growth and increase the yield.
Researchs show that the physical and chemical properties of eolian sandy soil can be significantly improved by direct application of leonardite. It is found that the application of Kangsu leonardite has obvious effect on improving the physical and chemical properties of saline soil. With the increase of weathered coal application, the pH of soil decreased. The content of organic matter increased. The total nitrogen and available phosphorus increased. It is also found that it has good effect when it is applied to the study of improving the reclaimed soil in mining area.