The appearance of urea is white, spherical particles, total nitrogen content ≥ 46.0%, easy to absorb moisture, and hygroscopicity is between ammonium sulfate and ammonium nitrate. Urea is easily soluble in water and liquid ammonia. When pure urea is heated to near the melting point under normal pressure, it begins to show instability, produces a condensation reaction, and produces biuret, which loses fertilizer effect on the crop. If you put a clean piece of iron on the stove and put the urea granules on it, it can be seen that the urea melts and volatilizes quickly, and a small amount of white smoke is emitted, which can smell ammonia.
The agricultural ammonium nitrate appearance is white or slightly gray crystal, with ammonia smell, nitrogen content ≥ 16.80% (secondary). It is highly hygroscopic, soluble in water, and the aqueous solution is weakly acidic. When you easily identify ammonium bicarbonate, you can use a finger to take a small amount of sample for rubbing, you can smell a strong ammonia smell.
The agricultural zinc sulfate has a white or micro-colored needle crystal. The zinc content of zinc sulfate heptahydrate should be ≥21.8%. Zinc sulfate is readily soluble in water and its aqueous solution is acidic.
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