Works Cited:
·Barak, Phillip, comp. "Essential Elements for Plant Growth." University of Wisconsin-Madison. 6 Mar. 2000. Wisconsin University. 16 Jan. 2008 <http://www.soils.wisc.edu/~barak/soilscience326/lawofmin.htm>.
·Leer, Steve. "'Hidden Hungar' Threatens Many Crops, Researcher Says." Purdue News. Comp. Don Huber. Dec. 2000. Purdue University. 7 Jan. 2008 <http://www.purdue.edu/UNS/html4ever/0012.Huber.deficiency.html>.
·Campbell, Keith B., Robert M. Millaway, Steven E. Petrie, Irvine L. Phillips, and J. Jullian Smith. Western Fertilizer Handbook. Ed. Albert E. Ludwick, Larry C. Bonczkowski, and Carl A. Bruice. 8th ed. Danville, IL.: Interstate, Inc., 1995. 1-337.
·"The Law of the Minimum." Cornell University. Cornell University. 7 Jan. 2008 <http://instruct1.cit.cornell.edu/courses/biog105/pages/demos/106/unit08/3a.lawofminimum.html>.