Discussion of all aspects of cellular structure, physiology and communication.
Fri Nov 25, 2011 4:42 pm
I just did a lab on eutrophication. We designed a system with an upper terrestrial layer, and the bottom containing an aquatic layer. The top layer was fertilized, and several experiments were done using different concentrations of fertilizer.
One of the questions I need to discuss in my presentation is: How do we know Nitrogen & Phosphorous are the limiting growth factors (in the terrestrial plant [Brassica rapa]? How can we demonstrate this?
Heres my thoughts so far:
We also performed a control, where we only used water with the terrestrial plant. After one month the control was only 1/3 the size of some of the fertilized plants. This is how we know N & P were the limiting growth factors.
Do you think this is a good enough justification of this statement?
Are there other ways to prove this?