Sorry to bump a thread, but I killed one of my test groups with too much urea, and I'm struggling to find any information about what specifically too much of a nitrogenous compound does to plants. Could any body point me to a source that has anything on this?
I'm sorry, I should have clarified that I only have 24 radish plants to grow in total. That's including the test group and the control. I could try a twelve-plant control and a twelve plant test group, with that test group split up into three different levels of concentration. I'm still not sure...
I have a project in my grade 11 biology class to design a controlled experiment showing how some factor affects plant growth, specifically radishes. I have decided to add urea as a nitrogen fertilizer to one group and do nothing to the other leaving all other factors the same between the two...