Dunno about your particular problem but I read that ash should
not be used with potatoes as it encourages scab.

Andy

"Paul Bonner" wrote in message
...
My potatoes are now 3ft 6 in high.
They are strong, lush and dark green. I am worried that they are going
to
turn out all top and no tubers.
What fertiliser should I use to encourage Tubers and less green.?
The ground that they are on has had several bonfires on it and there for
is
rich in ash

Help please and thanks.
Paul