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HYDRO Dropping pH DWC

I know I don't need armor si but it definitely has made a difference in the size of my stalks and strength of the branches. As for Cal-mag I had signs of Cal-Mag deficiency when the plants were very young and I wasn't using it in the nute mix yet, I have a ny diesel and bloody skunk that were started 2.5 weeks after these girls and I started them on Cal-Mag early and never saw any issues. Same thing with my first grow, I had Cal-Mag deficiency mostly in my chocolate kush plant but it was early on and once I started using Cal-Mag, no issues. When I started growing I didn't think I would need it either, especially given my starting ppm like you said.
 
I have never heard of internal EC and can not find any research talking about it other than other weed posts (have not seen any scientists talking about internal EC). I still think if ppm is rising, water level falling then you are over feeding. It may be nitrogen if the plant in the pic is the one you are talking about as the leaves look dark green indicating nitrogen toxicity.
 
I like this chart except where they claim that the plants take in nutrients by osmosis at the roots. They absorb water by osmosis and the osmotic pressure they describe can reverse leading to the plant releasing water from the roots. Nutrients are taken in by the plant roots through a process called cation exchange that takes place independently from water uptake. If the roots are leaving nutrients behind in a DWC reservoir to the point where the solution EC/ppm is rising either the nutrients are locked out or the plant doesn’t need them. Nutrient uptake is like a toll booth on a one way street with carbohydrates being paid by the roots as the toll. Once the nutrient is in the plant the only way out is through consumption. Plant leaves can absorb nutrients into their cells through osmosis but their roots require a more selective process.
 
I think the chart is a hand grenade range type thing, in my last grow I screwed up the cal-mag, it was causing all sorts of issues in the test plant. i adjusted nutrients without adjusting the cal mag, increasing the PPM but not really helping the matter.
 
Tersky , you're right the plant does look dark but it is actually starting to look a little better. It was darker last week. I cut micro to half of what I was feeding them, I only did this on my 2 plants that are furthest along in flowering because they got to be pretty dark almost blue.

Obi-Wan you definitely have a better understanding than I do in how plants feed and drink. Thanks for dropping some knowledge

​​​​​​​I really appreciate everyone's input. I think I can go about this a few ways to see what works,. I can increase the nutes for one plant, I can decrease the nutes on another, and I can leave another the same. I'll take readings morning and night to keep close track of what's happening.
 
I'm late to this party but yes, especially after I started air conditioning the basement the plants seem to be using much more water than nutes. I've been topping off with tap water which raises the pH. That's been fine because the pH has been dropping as the EC goes up.
 
I've got an ac running and a dehumidifier. My window unit keeps the basement cool but it doesn't remove moisture for shit. I have a real nice dehumidifier that pulls a lot of moisture from the air and I keep it regulated between 45-50%, sometimes it gets a bit higher when I need to empty it and it shuts off
 
GH answered my question regarding using pH up and pH down. I asked.... "Hey is it ok to use pH up and pH down in the same DWC reservoir? I use pH down to get my pH level where it needs to be when I change the reservoir water, over a few days the pH will drop, is it ok to use pH up or is it better to change the reservoir water again?"

They confirmed there are no issues using both and that makes me feel much better. I have now been doing it this way for just over a week and no adverse effects.
 
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