With your farms you need to look at the fertility overlays, find the most fertile area for each crop you wish to grow and build a three plot setup, plot 1 is crop > fallow > fallow, Plot 2 is fallow > crop > fallow, plot 3 is fallow > fallow > crop, build a farmhouse nearby and populate with dedicated farmers and oxen, you'll never need to touch them again for a continous supply.
With your farms you need to look at the fertility overlays, find the most fertile area for each crop you wish to grow and build a three plot setup, plot 1 is crop > fallow > fallow, Plot 2 is fallow > crop > fallow, plot 3 is fallow > fallow > crop, build a farmhouse nearby and populate with dedicated farmers and oxen, you'll never need to touch them again for a continous supply.