Potassium humate is a strong base weak acid salt formed by the ion exchange between weathered coal and potassium hydroxide. According to the theory of ionization in aqueous solutions, when potassium humate dissolves in water, potassium ions exist independently, while humic acid molecules combine with hydrogen ions in the water and release hydroxide ions, making the solution alkaline.
The property makes potassium humate an excellent organic top-dressing fertilizer, especially suitable for drip irrigation in areas with low water hardness.
Role of Potassium Humate in Nutrient Absorption
In addition to enhancing nutrient absorption by plants, potassium humate plays a crucial role in the degradation of pollutants and harmful substances. Its reducing capacity stems from functional groups such as quinones and phenols in its structure. This allows it to engage in redox reactions with heavy metals (like Cr(VI) and Hg(II)) and radioactive nuclides (like U(VI)), effectively converting and degrading these pollutants. Through electron transfer, it can accomplish this process with the help of microorganisms, showcasing its significant value in environmental remediation.
Moreover, potassium humate’s interaction with iron ions supports the cycling of iron in soil and water. It can reduce Fe(III) to Fe(II) even in the absence of microorganisms, accelerating its reduction rate, which is vital for soil health.
Market Variability and Quality Considerations
On the market, the price varies greatly, primarily depending on the potassium oxide(K2O) content. Generally, the reaction ratio of weathered coal or lignite to potassium hydroxide is between 10:1 and 1.5, resulting in the goods with potassium oxide content typically around 15%. It is important to note that with less than 15% potassium oxide may contain a higher proportion of sodium ions(Na). Therefore, when purchasing, it is essential to pay attention to both the potassium oxide content and the amount of insoluble matter.
Potassium humate is a valuable organic fertilizer with broad applications. It not only promotes plant growth but also plays a vital role in environmental protection. When selecting good product, consider both its potassium oxide content and insoluble matter to ensure quality and effectiveness. By understanding its properties and applications, we can better utilize potassium humate to contribute to agricultural production and environmental sustainability.
