Factors Of Soil Fertility
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Discusses the four factors upon which good crops depend and the chemical and mechanical treatments which are needed to produce them.
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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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