Learn to see these three points first.
First, look at the appearance of color, the color of the active humic acid fertilizer is not very dark, mostly grayish black or dark brown;
The second is to look at the color of the aqueous solution, take a small amount of sample particles, put it in a plastic bottle filled with water, until the particles completely disintegrate, observe the color of the aqueous solution, the color of the aqueous solution of the active humic acid fertilizer is generally brown or brown;
The third is to look at the color change after moisture absorption. Generally, the active humic acid fertilizer has good hygroscopicity. It can be seen that the active humic acid fertilizer particles become particularly bright with a mouthful of moisture or a sweaty hand. . Of course, farmers should choose well-known companies and choose big brands when purchasing humic acid fertilizers.
Have these four elements
The production of high-quality active humic acid functional fertilizers must have four elements:
First, high quality raw materials. High-quality humic acid fertilizers are generally selected from high-grade weathered coal in Xinjiang and Inner Mongolia and young brown coal in Yunnan, and are reasonably compatible;
The second is the activation process. By adopting a combination of ultrafine pulverization and oxidative extraction, a smaller molecular weight, more oxygen-containing functional groups, and higher physiological activity are obtained;
The third is the chelation process. The combination of humic acid with nitrogen, phosphorus and potassium also determines the application effect of humic acid fertilizer. The chelation reaction is not a simple mixing of humic acid with nitrogen, phosphorus and potassium. In production, it is necessary to precisely control the pH, temperature, and Key indicators such as moisture;
The fourth is to add the amount. The premixed ratio of humic acid to nitrogen, phosphorus and potassium also affects the agronomic effect of humic acid fertilizer. It is not the use of humic acid as much as possible. Years of practice have shown that when the humic acid content is 2-6%, the agronomic effect is more stable and more significant, which is also the identification quantity in the industry standard of "humic acid compound fertilizer".