Look at the physical state. Good liquid fertilizers are clear and transparent, clean and free of impurities, and there may be many solid insolubles in poor quality products.
Said the quality of the product. The specific gravity is an important indicator to measure the quality of liquid fertilizer products. Good products do not necessarily have a large proportion, but the proportion of a certain effective fertilizer is not sufficient.
Smell the smell of the product. Good liquid fertilizers often have no odor. The strong ammonia smell is not well controlled in the production process. The special scent is generally used to cover some odors that should not be present. The pungent smell is generally added. Substance.
Freeze test stability. Good liquid fertilizer is placed in the refrigerator for 24 hours and will not be layered and crystallized; if there is stratified crystallization, it means that there is no choice of raw materials in the production process and no control of the production process.
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