Bibliography

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Busman, Lowell., Lamb,Jony.,Gyles, Randall., Rehm, George., Schmitt,Michael. (2002). The Nature of Phosphorus in Soils. http://www.extension.umn.edu/distribution/cropsystems/DC6795.html

International Plant Nutrition Institute (1998) Functions of Phosphorus in Plants. http://www.ipni.net/ppiweb/bcrops.nsf/$webindex/ECBABED567ABDCDD852568EF0063C9F4/$file/99-1p06.pdf

Wiederholt, Ron. (2005). Phosphorus Behavior in the Environment.            http://www.ag.ndsu.edu/pubs/h2oqual/watnut/nm1298w.htm\