Source 1:
Rhoades, H. (2009, August 6). The Importance Of Phosphorus In Plant
Growth. Retrieved January 29, 2015, from
http://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/phosphorus-plant-growth.htm
This source is important because it demonstrates the importance of phosphorus and plant growth. Phosphorus helps produce healthy plants, and it is especially significant when growing plants in gardens to use fertilizer that has phosphorus in it because it makes them strong and beautiful. It also introduces the term 'phosphorus deficiency'.
Source 2:
Soils - Part 6: Phosphorus and Potassium in the Soil. (n.d.). Retrieved
January 29, 2015, from
http://passel.unl.edu/pages/informationmodule.php?idinformationmodule=1130447043&topicorder=2
This source provides additional information about phosphorus deficiency. It discusses coloring in plants (especially red/purple and dark green) in more depth than the previous source and emphasizes the importance of phosphorus in soil for growing plants. This element mainly promotes root growth and hastens maturity.
Very useful.
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