At first glance, whether the fertilizer packaging is standardized and strong, and whether the granularity (or crystalline state) of the fertilizer is uniform, depends on the color of the fertilizer.
The second touch is to put the fertilizer on the palm of the hand, hold it hard or press it to make a simple judgment on the true and false of the fertilizer according to the hand feeling.
The three sniffs should be judged simply by the special smell of the fertilizer, and the smell of the fake and shoddy fertilizer is not obvious.
The four burns heat or burn the fertilizer sample, and identify the fertilizer from the color of the flame, the melting condition, the smell of the smoke, the residue, and the like.
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