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post #1 of 9 (permalink) Old 02-22-2013, 02:26 AM Thread Starter
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School Project

We have a science project for school. I want to do the difference in immersed and submersed growth in aquatic plants. I was planning to do two dirt tanks, probably 2.5 gal or 10 gal. Probably grow crypts, some sort of stems(wysteria ), and some sort of moss.
Any suggestions for this?
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post #2 of 9 (permalink) Old 02-22-2013, 02:32 AM
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If emersed and submersed are your two variables, you'd want to keep almost everything else constant (other than what you obviously can't). You obviously have to spray the emersed every now and then. Spraying the submerged one won't make much of a difference. Same tank size, same substrate, same light.

Last edited by mistahoo; 02-22-2013 at 04:56 AM. Reason: .
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post #3 of 9 (permalink) Old 02-22-2013, 02:34 AM
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One factor you'd have a difficult time controlling is CO2 concentrations. If you can't think of a way to address that just write about it when mentioning sources of error.

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post #4 of 9 (permalink) Old 02-22-2013, 02:52 AM
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Originally Posted by Axelrodi202 View Post
One factor you'd have a difficult time controlling is CO2 concentrations. If you can't think of a way to address that just write about it when mentioning sources of error.
+1 The emersed one is going to have unlimited amounts of CO2 while the submerged is limited by what's in the water.

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post #5 of 9 (permalink) Old 02-22-2013, 03:08 AM
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on the contrary submersed plants have an unlimited supply of water... You should attempt to find a plant that grows well in relatively dry soil and submersed. Then you would have a good project showing the adaptions of a plant to it's environment. You could also show that many plants grow fastest in a wet environment and slower in a dry or totally submerged one and then you could go to explain the limitations of each environment.
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post #6 of 9 (permalink) Old 02-22-2013, 03:20 AM
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What if you did three tanks one immersed, submersed, and one submersed with co2 injection DIY or other
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post #7 of 9 (permalink) Old 02-22-2013, 05:03 AM
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Originally Posted by seanski21 View Post
on the contrary submersed plants have an unlimited supply of water... You should attempt to find a plant that grows well in relatively dry soil and submersed. Then you would have a good project showing the adaptions of a plant to it's environment. You could also show that many plants grow fastest in a wet environment and slower in a dry or totally submerged one and then you could go to explain the limitations of each environment.
In a tank that supply of water isn't unlimited due to evaporation. Also what I meant by being "limited" was the CO2. The amount of CO2 in a tank is not unlimited because there is only so much CO2 that will be held in the water which is limited by the size of the tank.
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post #8 of 9 (permalink) Old 02-22-2013, 05:31 PM Thread Starter
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Do you think the co2 limitations would be counter productive. I figured this would be the deciding factor of what is a better environment?
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post #9 of 9 (permalink) Old 02-22-2013, 10:52 PM
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Do you think the co2 limitations would be counter productive. I figured this would be the deciding factor of what is a better environment?
That's why I think doing three tanks would be better you could show how the plants do without enough co2 submersed and with unlimited amounts of co2 submersed
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