sitn.hms.harvard.edu/flash/2019/h...to-grow-food/
In the 19th century, a German botanist at the University of Wurzburg, Julius Sachs, dedicated his career to understanding the essential elements that plants need to survive. By examining differences between plants grown in soil and those grown in water, Sachs found that plants did not need to grow in soil but only needed the nutrients that are derived from microorganisms that live in the soil. In 1860, Sachs published the “nutrient solution” formula for growing plants in water, which set the foundation for modern day hydroponic technology.