Wilhelm Knop
Wilhelm Knop (28 June 1817 – 28 January 1891) was a German agrochemist and pioneer of water culture. Together with Julius von Sachs he identified Nitrogen, Phosphorus, Sulfur, Potassium, Calcium, Magnesium and Iron as essential elements of plant nutrition.[1] In addition, oxygen, carbon dioxide and hydrogen are taken from the air and water, respectively, for respiration and photosynthesis.
Wilhelm Knop | |
|---|---|
| Born | 28 July 1817 |
| Died | 28 January 1891 (aged 73) |
| Nationality | German |
| Alma mater | University of Göttingen |
| Scientific career | |
| Institutions | University of Göttingen University of Heidelberg University of Leipzig |
Dennis Robert Hoagland and Daniel I. Arnon proposed that Sachs's solution (1860) and Knop's solution (1865) should be supplemented with Boron, Manganese, Zinc, Copper and Molybdenum for best results with water culture experiments.[2] Knop's nutrient solution, which consists of his four-salt mixture, is still commonly used today.
References
- Marschner, Horst (1995). Mineral Nutrition of Higher Plants. ISBN 0124735436.
- Hoagland & Arnon (1938). The water-culture method for growing plants without soil (Circular (California Agricultural Experiment Station), 347. ed.). Berkeley, Calif.: University of California, College of Agriculture, Agricultural Experiment Station. OCLC 12406778.
- Heinz Walter (1980), "Knop, Wilhelm", Neue Deutsche Biographie (in German), 12, Berlin: Duncker & Humblot, pp. 214–215
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