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How does adding nitrogen affect the duckweed population growth?

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The container with nitrogen will have more duckweed after 3 days. (About 2 times the amount of duckweed).

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Gather 2 containers, water, nitrate, and duckweed. Next, fill on container with water, and the other with water and nitrates. Then, place around 8 duckweed in each container and measure how much duckweed is in each container everyday, including Day 0.

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According to our data, the nitrogen was a more logistic growth model because after it reached the carrying capacity (K), it had a higher death rate than birth rate so it decreased in number of duckweed. The "no nitrogen", also known as container with just water, had a steadier growth and still slowed down its growth. It grew less though, so adding nitrogen affects the population growth more than just water, but it looks like it will fluctuate, according to our graph of data.

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I learned that nitrogen is a good thing for duckweed in water; however, if there is too much duckweed, light will not reach the algae at the bottom of the pond, so nitrogen can be bad. A question I have is what else can effect algae? Is there anything else that works like duckweed and blocks out the light? Lastly, I believe my group and I did extremely well, except for the dying and dead duckweed.

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Nitrogen Container-lots of duckweed after days.

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No Nitrogen Container-a couple more duckweed after 12 days (less than Nitrogen Container).