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What I learned: Voiceover
https://drive.google.com/file/d/0B7PM-Uh-lp8YZkdhTmRPOUtCaEU/view

What questions remain:
Is there such thing as too much nitrate?
How long would the 10 and 15 drops nitrate solution petri dishes keep growing?

How did I perform: I stayed on task the entire time and did not waste my time. I (along with my group) tried to set up the experiment as perfectly as possible to try and have as little experimental error as possible.

How my group performed: We all worked well together, getting everything done quickly and efficiently. One thing that we should have done differently from the start is to have had one person count the duckweed so that there was no error in the way someone counted.

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We concluded that if nitrate levels were higher, then the growth of duckweed population was greater, making our hypothesis correct. Our control group, which had no nitrate solution, grew very little, and died off early on. This shows that nitrate levels are extremely important in order for the duckweed to grow and live. The logistic growth curve that was present in our date showed that nitrate was the reason that the "ecosystem" reached its carrying capacity, because the 5 drop petri dish started leveling off earlier than the 10 and 15 drop petri dishes. Also, this experiment showed how rapidly duckweed was able to grow when given nutrients, sunlight and water, helping me to understand why some ecosystems have a problem of a huge population of duckweed. Our data can tie to research about the amount of nitrate present in different ecosystems, and how that affects growth of an organism. For example, there are many ecosystems where duckweed overpopulate an area due to high levels of nitrate because of run-off.

Nitrate and Aquarium Plants YouTube Video: https://www.youtube.com/watch?v=FLMB_ct1VEI

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-Logistic Growth: This is when a population's per capita rate of increase increases and then levels off to eventually become zero (it has no slope). This kind of curve can also be called an "s" curve because it the graph of it looks like an "s." Our duckweed data followed the logistic growth model. The reason why will be explained through other scientific principles below.
-Carrying Capacity: The logistic in the duckweed growth was likely to due carrying capacity, which is the maximum number of organisms that can be supported by a certain ecosystem.
-Important of Nutrients: The  control duckweed barely grew at all, while the 15 drop solution  duckweed grew more than 4 times more, showing that nitrate was vital for the duckweed to grow.

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-Our control stopped growing around day 7 of our lab.
-By the last day of the lab, the control had all turned brown.
-There was not a big difference between the growths in the levels of nitrate solution;
-There were no browning duckweed in our 10 drop and 15 drop petri dishes.
-A few dishes had algal blooms.

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Our procedure was simple. We had 4 petri dishes set up with 25 mL of water in each. We set one aside to be our control group to which we would compare our other data to. In each of the other petri dishes, we put 5, 10, and 15 drops of nitrate solution. We placed 10 fronds of duckweed into each petri dish, and then recorded the number of fronds roughly every other day.

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-40 Duckweed Fronds
-4 Petri Dishes and Covers
-Nitrate Solution
-Water

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If the concentrations of nitrate solution is higher, then then the growth of the duckweed population will be greater. Below is the graph that my group and I drew prior to our experiment.