What is the difference between amino acid, fish protein, fulvic acid and seaweed extract?

There are many fertilizers on the market. They are  known as bio stimulants , such as amino acids, fish protein, fulvic acid, seaweed extract.
As ordinary users, do we also want to know the difference among these fertilizers? Today, we use a very vivid metaphor to sort out for you. C-omparing plants to a processing factory. The goal of our agricultural cultivation is to let factories produce more cars.

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