Research Challenge #3:
These kinds of questions can be addressed using seed germination bioassays. A fact sheet from Cornell's Horticulture Department describes how to carry out this type of bioassay and what sorts of treatment are possible if harmful herbicide residues are found in soil.
Your challenge is to come up with an interesting research
question that relates to herbicide residues in soil, then design and carry
out one or more bioassay experiments to address your question. Be sure to share
your results using EI's discussion
boards or on-line peer review system.
Good luck and have fun!