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CH2O, carbohydrate, is the main product produced by plants.
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The harvested grains contain nitrogen and phosphorus which are transported to city.
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Soils can be depleted of Nitrogen, Phosphorus and other minerals. Nitrogen and Phosphorus are added to soil by farmers in IL.
Speaker Notes:
The carbon atoms in the carbohydrate of plants come from the carbon dioxide in the atmosphere. The Hydrogen and oxygen come from water.