Look at the physical state. Good liquid fertilizers are clear and transparent, clean and free of impurities, while products with poor quality may have many solid insolubles.
Product quality. The proportion of specific gravity is an important indicator to measure the quality of liquid fertilizer products. A good product does not necessarily have a large proportion, but a certain amount of a certain amount of effective fertilizer is not sufficient.
Smell the product smell. Good liquid fertilizers often have no odor, and there is a strong ammonia smell in the production process is not a good grasp of acidity, a special smell is generally to cover some of the odor should not have a pungent odor is generally added should not be added The substance.
Freezing test stability. Good liquid fertilizers placed in the freezer and frozen for 24 hours will not be stratified by crystallization; if there is a stratified crystallization phenomenon, it indicates that the raw materials are not selected during the production process and the production process is not controlled.
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