The role and mechanism of potassium fulvic acid
The role and mechanism of potassium fulvic acid : improve the nutrient utilization of soil and fertilizer.
Potassium fulvate is a kind of green mineral element active potassium fertilizer, which has a series of functions that can directly or indirectly promote plant growth. One of them is to improve the nutrient use efficiency of soil and fertilizer.
The functional groups such as carboxyl, carbonyl, and phenolic hydroxyl in potassium fulvic acid endow it with strong ion exchange and adsorption capabilities, thereby producing a regulatory effect on the nutrient forms in soil and fertilizers, and can significantly improve the utilization of nitrogen, phosphorus, potassium fertilizers and trace elements to plants. Potassium fulvate can generate humic acid-urea complex through the action of its own carboxyl group and phenolic hydroxyl group and the amide group of urea. This substance has high stability, can inhibit the decomposition of urea, improve nitrogen utilization efficiency, and realize the utilization of urea Long-acting sustained release.
In addition, potassium fulvic acid can also reduce the loss of soil and fertilizer nutrients, and fix the ammonium nitrogen in the soil through abiotic action, that is, when the urea in the soil is hydrated into ammonium nitrogen, it can be adsorbed by humic acid and ammonified The reaction generates humic acid ammonium salt with a lower degree of dissociation, which can reduce the loss of ammonium nitrogen. Potassium fulvic acid applied to the soil causes a temporary decrease in soil pH, which inhibits the hydrolysis of urea in the soil, thereby reducing the ammonia volatilization loss of urea by 13% to 20%. Potassium fulvate can also reduce the loss of ammonium nitrogen and nitrate nitrogen in rice soil with the drainage of farmland.
The active hydroxyl functional group of humic acid contained in potassium fulvic acid makes it have the function of surfactant, which can not only generate water-soluble humic acid phosphorus with phosphorus in fertilizer, but also fix and adsorb potassium in fertilizer or combine with Potassium reacts to form the limb compound potassium humate. As a powerful colloidal substance, humic acid can also undergo chelation or complexation reactions with trace elements such as iron, zinc, manganese, and boron in the soil to generate soluble humic acid trace element salts with colloidal properties, which is beneficial to the absorption of crop roots and use.