You asked this awhile ago and no answers...I have been looking all throughout google for this answer and there is NOTHING. No mention. This is pretty important info, and I can't find it anywhere. From what I have observed in my own experience is that food gives simple meals, and minning can sometimes give gold or plasteel. What I am wanting to know is if logging can give plant resources such as Hay or raw ingredients. Really hope this mod gets some better documentation.

When you get the tithe delivered you get a message.
Beforehand, no info seems to be given.
(Which is kinda annoying because the output of a settlement does not seem to be corresponding to its level, i.e. a high level settlement may deliver lavish meals one week and disgusting slimesludge the next.)

The gear besides the enable tithe check/cross allows you to enable or disable the settlement from delivering the items you have enabled.