Controlled release fertilizer quality identification

First, put the controlled release fertilizer and common compound fertilizer in two glass cups filled with water, gently stir for a few minutes, the compound fertilizer will dissolve faster, the particles become smaller or completely dissolved, and the water is turbid, and the control The release fertilizer does not dissolve, and the water quality is clear, no impurities, and bubbles appear around the particles.


Second, because the core of controlled release fertilizer is NPK compound fertilizer, so the controlled release fertilizer stripped in the shell will be dissolved quickly in the water. If the shell is not dissolved, it is inferior fertilizer or fake fertilizer.

Third, it cannot be distinguished by color. Some manufacturers prevent the color of the controlled release fertilizer, and make the common fertilizer the same color as the controlled release fertilizer. If it is placed in the water, the controlled release fertilizer is decolorized, the water quality is turbid and colored, indicating that it is an anti-counterfeiting product, a real controlled release fertilizer. The outer membrane is not bleached.
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