Justus von Liebig
'''Justus ''Freiherr'' von Liebig''', .}} (12 May 1803 – 18 April 1873) was a German scientist who made major contributions to the theory, practice, and pedagogy of chemistry, as well as to agricultural and
biological chemistry; he is considered one of the principal founders of
organic chemistry. As a professor at the
University of Giessen, he devised the modern laboratory-oriented teaching method, and for such innovations, he is regarded as one of the most outstanding chemistry teachers of all time. He has been described as the "father of the
fertilizer industry" for his emphasis on
nitrogen and
minerals as essential plant
nutrients, and his popularization of the
law of the minimum, which states that plant growth is limited by the scarcest nutrient resource, rather than the total amount of resources available. He also developed a manufacturing process for
beef extracts, and with his consent a company, called
Liebig Extract of Meat Company, was founded to exploit the concept; it later introduced the
Oxo brand beef
bouillon cube. He popularized an earlier invention for condensing vapors, which came to be known as the
Liebig condenser.
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