Potassium For Agriculture
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Describes the production of potassium in the United States and Canada. Illustrates the action of potassium in the soil and discusses how to test soils and plants to determine their potassium needs.
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Sources
- A-V Online (National Information Center for Educational Media). CD-ROM database of educational and documentary media, compiled and maintained by the National Information Center for Educational Media (NICEM). — title, year, creator, length, format, sound, description
- 16mm Filmography (legacy record) — catalog record
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