Pat,

Out of curiosity, at what strengths were you using the Dyna-Gro products? I
used about 1 teaspoon per gallon of each, which gave me a pH of about 6.3
and a nitrogen loading of about 100 ppm.

I had considered that maybe the major difference was the substrate itself,
as I grow a lot in PrimeAgra in S/H culture, but I also have lots of plants
in sphagnum, in CHC/charcoal/perlite, and in baskets with little or no
medium, and I didn't have any such problems.

This is most curious....

Oh yeah, one more thing. How can sharing your experience make you a
scum???? I think it has led to an interesting discussion!

--

Ray Barkalow - First Rays Orchids - www.firstrays.com
Plants, Supplies, Artwork, Books and Lots of Free Info!


"Pat Brennan" wrote in message
...
"Ray" wrote in message
...
Whoa!!! I think Pat has unnecessarily painted a real scary picture
there.
snip

I know three growers who have used RO water without any problems. Ray is
one of them. I know six growers who have cooked plants with RO. I am one
of them. Ray used Dyna-Gro/ProTekt in RO water with great results for
years. I used Dyna-Gro/ProTekt in RO water and after 3 months my
substrate pH was sitting at 3.6. MSU fertilizer makers do not seem to be
concerned with adding alkalinity to RO water, while a similar formulation
from Jack Peters suggests it very strongly. I am of the school that thinks
alkalinity should be added back into RO water, Ray is not. Why the
differences? I do not know. This is not an opinion thing, both Ray's
knowledge and my own have been learned first hand with years of growing.
Maybe it has something to due with the RO units, the substrate we use, or
our watering habits. But when you make the switch to RO either you will
have no problems and I will seem like a scum unnecessarily scaring people
or your substrate pH will crash and Ray will seem like an idiot. I hope I
am the scum, but the leachate tests will help identify problems before
plants are damaged. I think Ray will agree with me here, I highly
recommend you read these articles before you make the switch.

http://www.firstrays.com/PDF/Part%205%20-%20final.pdf

http://www.firstrays.com/PDF/Part%20...%20quality.pdf

Pat