This is the expected work to get a 100% yield bonus from your crop using the base game (no mods) farming technique.
I messed up a lot as I forgot to mulch and my fertilisation level was set to 100% as I didn't harvest the previous crop. We just plowed. But I explain what to do when I come to the realisation of messing up. This is the expectation from plowing. Any questions please comment, I would love to help you!