Plants Eat Dirt, People Eat Protoplasm
Plants form mutual associations with soil fungi. These fungi, mycorrhizas, convert atmospheric nitrogen into a chemical form plants can use. This extensively illustrated website describes the types of associations mycorrhizas form and how the relationships work.
Visit the Overview: Mycorrhizas web site
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From Fertility Gods to Fertilizers
In Chapter 13 you read about experiments in plant nutrition by Van Helmont, de Saussure and others. This website provides further information on hydroponics history, plant nutrients, and current hydroponic systems.
Visit the History of Hydroponics web site
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