Mog Garden - Furrow Rank 7

What does one get for getting the furrows to rank 7?
The tree and vein get another item spot, the nets get new fish.
Do the furrows get time shortening or more item slots or something else?

Nothing. It may have higher chances to grow rare foods, but no one cares enough to verify something like that. But you still have to do it if you want access to the things that follow.

I see. It would have been nice to get something easily tangible.