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.

auto parts
Using fish protein and amino acids to provide semi-finished products,  such as wheels, engines, hardware accessories directly to the factory. So as to meet the needs of the factory to produce enough cars.
Using fulvic acid and seaweed extract is equivalent to teaching workers. In order to improve the enthusiasm and efficiency of workers, so as to increase the output of cars.Another meaning is fulvic acid and seaweed extract will help plant to absorb NPK fertilizer more effectively.