References for More Information: 

Better Crops. (1998). Potassium Interactions with Other Nutrients. Retrieved July 19, 2017, from International Plant Nutrition Institute (IPNI) website: http://www.ipni.net/publication/bettercrops.nsf/0/DD30AA083C1F782A8525798000820361/$FILE/Better%20Crops%201998-3%20p12.pdf  

E.S.S.R.E 2017 Biota Survey Groups. (n.d.). Retrieved July 24, 2017, from Essre website: http://essre.rpcs.org/2017/Index2.html  

The Importance of Calcium. (n.d.). Retrieved July 19, 2017, from Tetra Chemicals website: http://www.tetrachemicals.com/Products/Agriculture/The_Importance_of_Calcium.aqf 

Johansen, C., Edwards, D. G., & Loneragan, J. F. (1968, May 17). Interaction Between Potassium and Calcium in their Absorption by Intact Barley Plants. I. Effects of Potassium on Calcium Absorption. Retrieved July 19, 2017, from Department of Soil Science and Plant Nutrition, Institute of Agriculture, University of Western Australia, Nedlands, Western Australia 6009 website: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1087064/pdf/plntphys00489-0125.pdf  

Kaiser, D. E., Rose, C. J., & Lamb, J. A. (n.d.). Potassium for Crop Production. Retrieved July 19, 2017, from University of Minnesota Extension website: http://www.extension.umn.edu/agriculture/nutrient-management/potassium/potassium-for-crop-production/  

Lovejoy, R. (n.d.). Ways to Treat High Potassium in Soil. Retrieved July 20, 2017, from SF Gate website: http://homeguides.sfgate.com/ways-treat-high-potassium-soil-102992.html  

Moss, A., Miller, L., & Simmons, A. (2003, July). The Effect of Worm Population on the Rise and Fall of Levels of Aluminum in Soil. Retrieved July 24, 2017, from ESSRE website: http://essre.rpcs.org/2003/ESSRE%202003%20Student%20Webs/Aluminum.pdf  

Rhoades, H. (n.d.). Plants and Potassium: Using Potassium and Potassium Deficiency in Plants. Retrieved July 19, 2017, from Gardening Know How website: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/plants-potassium.htm 

Sela, G. (n.d.). Potassium in Plants. Retrieved July 19, 2017, from Smart! Fertilizer Management website: http://www.smart-fertilizer.com/articles/potassium-in-plants 

E.S.S.R.E. Biota Survey: http://essre.rpcs.org/ESSRE%20Survey%20Data/Total%20Site%20Data%20Fixed.html