What's the best way to get more potassium in the soil? The soil had lots of
compost and manure worked into it before planting.


It should be ok. I sue 10 gallons of wood ash per 100 feet of row, Deleivers
both potassium and elevates the pH which beets require,

Unless you are somewhere north of Detroit, beets should be done or least
finishing up. Certainly it is too hot in most areas for beets to do much
growing