I have my usual summer bumper crop of SA and am once again trying to figure
out how to change this permanently. I know my pond does not circulate very
well (filter and waterfall both on the same end) and that my aeration isn't
that great (short waterfall), but beyond that I'm stymied.

My water is always clear and though the plants grow well, the older leaves
yellow. My nitrate levels are always 0. I add potassium regularly, and
have experimented with magnesium and iron occasionally. The plants respond
to one of these when I add them, but I have loads of SA in the shallower
parts of the pond, in the hyacinth roots, etc. I harvest enough to use it
as yarn - knit it into sweaters maybe? Paperweights?

Anyway, adding an airstone made no noticeable dent last year. All readings
are w/in normal ranges, but I remember reading once that if a pond is
nitrate limited, SA can out-compete for available nitrogen.

My plan is to reshape the pond for better circulation and hopefully better
O2, and perhaps up by potassium doses, since it makes more intuitive sense
that my pond is K-limited, but any other ideas?

Can anyone help here?

"Mike Miller" wrote in message
news:lZUSa.101636$GL4.27463@rwcrnsc53...
I have my usual summer bumper crop of SA and am once again trying to
figure
out how to change this permanently. I know my pond does not circulate
very
well (filter and waterfall both on the same end) and that my aeration
isn't
that great (short waterfall), but beyond that I'm stymied.

My water is always clear and though the plants grow well, the older leaves
yellow. My nitrate levels are always 0. I add potassium regularly, and
have experimented with magnesium and iron occasionally. The plants
respond
to one of these when I add them, but I have loads of SA in the shallower
parts of the pond, in the hyacinth roots, etc. I harvest enough to use it
as yarn - knit it into sweaters maybe? Paperweights?

Anyway, adding an airstone made no noticeable dent last year. All
readings
are w/in normal ranges, but I remember reading once that if a pond is
nitrate limited, SA can out-compete for available nitrogen.

My plan is to reshape the pond for better circulation and hopefully better
O2, and perhaps up by potassium doses, since it makes more intuitive sense
that my pond is K-limited, but any other ideas?

MM wrote I add potassium regularly, and
have experimented with magnesium and iron occasionally

Too many nutrients is about the only thing
I can think of. If the SA wasn't snarfing them up then the single cell algae
would be taking over.

Not sure about being K-limited but someone else might have some answers.


k30a