Does The Huge Affect The Algae In The Water?

Fertilizer has been known to help plants and food crops by making them grow faster and larger. Fertilizer is used on many of the foods we eat by the fertilizer is not only in the plant crops. Fertilizer becomes excess runoff in the water as it rains. That eventually my end up inside our ponds and lakes. In the case of piper lake, a fertilizer plant, HTC fertilizers, leakes large amounts of fertilizer into eagle river which feeds onto piper lake. Since then algal blooms have been a dramatic increase. We did an experiment to truly if the fertilizer was affecting the algae in the water.

In our experiment we had 6 test tubes. Each test tube had a different ratio of algae to fertilizer in the water. Our first test tube was our control (15 mL of algae water), with no fertilizer as piper lake was before the excess fertilizer started leaking in. the next 5 test tubes had varying amounts of fertilizer as shown by the table. All of the test tubes added up to 15 mL. Over to course of 7 days we collected containing data on the growth of the algae. My hypothesis was that if we add varying amounts of fertilizer into the water from Piper Lake, the fertilizer will increase the algal blooms.
We measured the pH of the water in each of the test tubes and recorded it in our notebook. The 2nd day completed a consistent pH level of 7 (neutral). On the third day the control test tube 1 had a pH level of 8 while everything else stayed at the pH level of 7. The last day (day 7) we found that test tube 2 was catching up to the control and had a pH level of 8 while all the rest had the same level as the last time we were able to collect data. We observed that every day that we collected data that all the test tubes seemed to have the same concentration of