Phosphorus deficiency (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Phosphorus deficiency" in English language version.

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doi.org

Heinrich W. Scherer "Fertilizers" in Ullmann's Encyclopedia of Industrial Chemistry, 2000, Wiley-VCH, Weinheim. doi:10.1002/14356007.a10_323.pub3

Sawyer, J.E. (2008). Differentiating and Understanding the Mehlich 3, Bray, and Olsen Soil Phosphorus Tests. Retrieved from: http://www.agronext.iastate.edu/soilfertility/presentations/mbotest.pdf

Angelova, V., Bekjarov, G., Dospatliev, L., Ivanov, & K., Zaprjanova, P. (2010). ICP determination of phosphorus in soils and plants. Retrieved from: http://iuss.org/19th%20WCSS/Symposium/pdf/1629.pdf

Department of Soil Science, University of Wisconsin-Madison. (2004). Available phosphorus. Wisconsin Procedures for Soil Testing, Plant Analysis and Feed and Forage Analysis. Retrieved from: http://datcp.wi.gov/uploads/Farms/pdf/WIProcSoilTestingAnaysis.pdf.