rkymtnman
Well-Known Member
this statement is not true. his ppms are rising because the ppm is too strong not because the water volume dropped to 25% of it's original volume.
ppm rising in flower
- Thread starter shiva71
- Start date
Jimdamick
Well-Known Member
All I know is that when I maintain a level of 1500 ppm in my rdwc and have to fill every 2 days. the solution that is my res is over 1700 before I fill.
I add water to bring it back down to 1500 in bloom, and that is my cycle.
I introduce nutes in the beginning of my bloom grow, and very rarely add more.
Your solution will concentrate so all you really have to do is add water.
rkymtnman
Well-Known Member
i had the opposite in dwc/rdwc. if i started on day 1 with 1.2EC by the end of the week my EC was at 0.2 and my water level was almost empty. i'd drain it, and do it all over again.
look at the chart @Jypsy Dog put up: if water is dropping and ppm is rising, your ppms is too strong.
i imagine that evaporation could cause ppm to rise but there would have to be alot of evaporation considering a dwc/rdwc setup is mostly sealed or at least covered up.
Jimdamick
Well-Known Member
I run at a high EC/PPM and I find that the fluctuation in evaporation/uptake makes it rise considerably, but adding only water to refill the res keeps it where I want it (1500ppm in bloom), which some people consider high, but it works for me.
Both statements are true
His ppms are too high so the plants are using water more than food
And
Since he does not top off it makes it worse, if he did top off his ppms would be lower.
Plus I think it is bad practice to not top off and let the Rez run down. Roots adjust to their environment, roots in water and in air are different. In dwc I feel they are happier always being in the same state and not wasting energy adjusting. Plus you don’t run into your ppms going high.
His ppms are too high so the plants are using water more than food
And
Since he does not top off it makes it worse, if he did top off his ppms would be lower.
Plus I think it is bad practice to not top off and let the Rez run down. Roots adjust to their environment, roots in water and in air are different. In dwc I feel they are happier always being in the same state and not wasting energy adjusting. Plus you don’t run into your ppms going high.
Jypsy Dog
Well-Known Member
Gotta cut the salts.
hellmutt bones
Well-Known Member
Hey noob she is telling you to feed her just water and that shes done and ready to chop. Just flush for 2 weeks and ur good! You can tank me later noob
And in case you didn’t notice he really wants to stress noob. I won’t bother going into why I think flushing is nonsense, I’ll just add there are two trains of thought, so do yourself a huge favor and try both. Flush one harvest and then don’t flush and make up your own mind.
shiva71
Well-Known Member
Ok thanks guys lots of very useful info there. I mixed up a bucket of solution at about 500 and adjusted the res down to 650 last night, it is now 900.
This is exactly what happened last time I tried topping up with a nutrient solution, my ppm sky rocketed.
But I can't follow the idea of topping off with just water...let's say ideal situation, ppm constant water level dropping. If you top up with just water ppm will drop and the more you top up the weaker the solution gets, and your plant is underfed until you do a fresh res. This can't be desirable...or?
Cheers!
This is exactly what happened last time I tried topping up with a nutrient solution, my ppm sky rocketed.
But I can't follow the idea of topping off with just water...let's say ideal situation, ppm constant water level dropping. If you top up with just water ppm will drop and the more you top up the weaker the solution gets, and your plant is underfed until you do a fresh res. This can't be desirable...or?
Cheers!
I personally don’t go too much over 900 but there are people who get amazing results with 1200 or higher and that’s a fact so I can’t agree with this statement.
I didn’t tell you to just top off with water. Top off, take your reading and adjust.
Jypsy Dog
Well-Known Member
You've received correct info on resolving the issue. Hope your questioning of it doesn't cost you the end of your grow. Good Luck.
rkymtnman
Well-Known Member
so it's been a few days now that your ppm keeps rising no matter what?
you could have nute lockout going on. are your roots OK? no root rot?
if the ppms keep rising,
i'd think about a 12 hour flush with plain water and then start back at maybe 300 or 400ppm.
shiva71
Well-Known Member
Thanks, if you guys are saying top up with plain water (as opposed to a nute solution) then that's what I'll do in future, cheers!
shiva71
Well-Known Member
Yeah seems to have started when I went over to bloom nutes and began using canna boost. I think I'm gonna dilute down one more time to 400 or so and if it still goes up yes I'll flush for a day and start fresh.
But this thing about plants needing fewer nutes as they near the end, is this a big drop or does it depend on strain?
Thanks for the help guys
rkymtnman
Well-Known Member
i would drop mine from 1.2 to 0.6 EC at the end. usually the last 2 or 3 weeks.
i'll have to look up that Canna boost. i'm not familiar with what it is or does.
Cx2H
Well-Known Member
I ramp my ppms up to a peak then back down no matter what medium I use. Never flush sheet unless you got a hot medium and then you are still feeding it basically.
Cx2H
Well-Known Member
it's cannas PGR booster that costs 90$ a lt.