http://chestofbooks.com/reference/The-New-Student-s-Reference-Work-Vol5/Why-Does-Iron-Rust.html
http://wiki.answers.com/Q/How_can_rust_be_useful_to_the_soil
http://nesoil.com/properties/eshwt.htm
Iron in soil
http://en.wikipedia.org/wiki/Soil_pH
http://www.blurtit.com/q107962.html
iron in plants. what it does.
dont use.
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