Simple and quick way to distinguish true and false urea
Use the test water temperature to identify the true and false of urea: put a cup of warm water, grab a handful of urea and put it in the water, the urea will dissolve quickly, and it will be very clear after dissolution. A slight drop indicates that the quality of the urea released is unqualified and the nitrogen content is low; if the urea released is false, the water temperature will not drop.
How to identify diammonium phosphate
(1) Real diammonium phosphate is very hard and not easy to be crushed, and pseudo-ammonium phosphate is easy to be crushed.
(2) Grab a handful of fertilizer and hold it for a few times. The "oily" feeling is the genuine product, while the dry one is likely to be impersonated with inferior compound fertilizer.
(3) Take a little fertilizer granules in a container to melt with water, add a small amount of alkaline surface to the solution, and a fertilizer that bubbles out after a while is a qualified product. It can be concluded that it is not diammonium phosphate that bubbled up immediately.
Method for identifying true and false of compound fertilizer
See: Whether the fertilizer is double-packed, whether the outer packaging bag is marked with the trademark, production license number, agricultural use registration number, standard code, total nutrient content and nutrient distribution formula, and the name and address of the production enterprise.
Touch: Rub the compound fertilizer with half a hand to rub it, and leave a layer of off-white powder on the hand with sticky feeling for good quality. Most of the inferior compound fertilizers are gray-black powders, with no stickiness, and no white crystals in the granules.
Burning: Burning on an open flame, nitrogen has ammonia smell, potassium has a yellow flame, the thicker the ammonia smell, the yellower the yellow flame, the higher the content, otherwise the inferior compound fertilizer.
Dissolution: The high-quality compound fertilizer has good water solubility, most of which can be dissolved, even if there is a small amount of precipitation. The inferior compound fertilizer is difficult to dissolve in water, and the residue is rough and hard.
Taste: You can try the red granulated potassium compound fertilizer. The authentic fertilizer has a salty taste, while the counterfeit fertilizer has no salty taste.
Wen: Compound fertilizers generally have no odor (except for organic-inorganic compound fertilizers). If they have an odor, they are inferior compound fertilizers.
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