A successful Monday - got the entire sensor suite running properly.
One notable - and very easily preventable - issue that I ran into: I had wired the RTC into a ground rail that didn't tie back to the Arduino's ground. Always double-check your grounds! It's easy to overlook, but it can cause a lot of confusing data problems. A teachable moment, at least.
Testing in the greenhouse begins this week. I'll replicate the previous study's conditions as much as possible to see what kind of correlation we find.