Samuel William Johnson
![250px](https://upload.wikimedia.org/wikipedia/commons/c/ca/PSM_V43_D010_Samuel_William_Johnson.jpg)
Johnson, working in the 19th century, covered various aspects of farming that today would be called both organic and nonorganic. His work included exposing frauds in artificial manures (some of which would today be called chemical fertilizers). Provided by Wikipedia
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