"Jim and Phyllis Hurley" wrote in message
.. .
As I remember it, the answer was 1 tbsp per 1000 gal per week in high
growing season. Probably varies a lot depending on how many plants are
grabbing the potash for growth.
snip

I use 1 FAT tablespoon per thousand gallons, every few weeks. I have heard,
and found that overdosing is difficult or impossible, so my measurements are
done by hand.

BV.