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The Effects of Nitrogen and Phosphorus Enrichment on Water Samples from Encanto Lake and the Rio Salado River.

Phoenix College


The purpose of this is experiment is to more closely understand the effects of nutrient enrichment on samples of water from Encanto Park Lake and the Rio Salado River. More specifically the concentration of nitrogen, phosphorus, and nitrogen and phosphorus together were altered and the effects this had upon algal growth were then observed. The results indicated that an increase in nitrogen concentration showed minimal difference in algal growth. The increase in phosphorus concentration resulted in a much stronger increase in algal growth rates. When nitrogen and phosphorus concentrations were increased together the largest algal growth rates were shown. These results show that phosphorus is in fact the limiting nutrient in algal growth, and in order to see the highest increase in algal growth, both nutrients needed to be added.


The Effects of Nitrogen and Phosphorus Enrichment on Water Samples from Encanto Lake and the Rio Salado River.

Introduction Eutrophication is the direct result of non-point nutrient pollution, specifically phosphorous, in freshwater sources that leads to excessive algal growth, and lowers overall water clarity and quality (Kung 1991). There is an ever-increasing battle being fought to control eutrophication. In this battle it is important to understand that that we will never return to baseline levels of nutrient densities as seen in the past. When viewed under the “macroscope,” that is to look at the situation from a global...

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