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12-03-2003, 06:45 PM
Kcristy
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yellowing
In article ,
(Victor
M. Martinez) writes:
Kcristy wrote:
I've read that when you see yellowing/browning leaves in only slow growing
plants (like anubias) it can actually be a symptom of an excess (poisoning)
of
nutrients. Fast growing plants would not be affected. The fast growers
will
Hmmm... the oldest (and largest) leaf on my anubias is getting a yellow tint
near the edges. I just thought it was dying as terrestrial leafs do. What
kind of nutrient excess causes this?
Well, according to Hiscock, it can be an excess of any nutrient or combination
of nutrients. You can't tell which by the plant symptoms, you just have to
look at the level of nutrients the plant is getting through the water and
substrate. And since most of us don't have the capability to measure most
nutrients we just have to experiment with what we add until we get the right
balance. The reason, btw, that slow growing plants will be poisoned while fast
growers are ok is that the fast growers can put out leaves quickly enough to
dilute the effect of receiving the excess nutrient while the slow growers just
build up the nutrient in their stores until it becomes toxic.
Cris
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yellowing