- Thread starter
- #221
First Ever Grow Need Help! DWC
- Thread starter Gutter444
- Start date
The ppm is getting up there. Measure it again after a couple of days (it will go up) and watch for indications of toxicity.
- Thread starter
- #223
Gutter444
Well-Known Member
I usually check my ppm and pH 3-4 times daily at the least two though. So I will definitely keep an eye out for that!
Measuring often is a great method for tracking the rise in EC (or ppm), which naturally occurs as the plant transpires (and from evaporation from the media)
Once it gets too high, the plant can’t produce enough sugars to make the concentration higher inside the roots than outside them, and water is pulled out of the plant to try to dilute the solution outside the roots (this is how osmosis works). “Nute burn” is actually dehydration of the leaf tips as a result of this loss of water.
More seriously, transpiration virtually stops, and then the plant can’t pull needed nutrients to the upper parts (like actively growing shoots and leaves) that need them.
Trust me - I know from personal experience that you don’t want to go down the path of high ppms. You should be able to gradually go up to 500-600 and see very good growth, without having issues.
Once it gets too high, the plant can’t produce enough sugars to make the concentration higher inside the roots than outside them, and water is pulled out of the plant to try to dilute the solution outside the roots (this is how osmosis works). “Nute burn” is actually dehydration of the leaf tips as a result of this loss of water.
More seriously, transpiration virtually stops, and then the plant can’t pull needed nutrients to the upper parts (like actively growing shoots and leaves) that need them.
Trust me - I know from personal experience that you don’t want to go down the path of high ppms. You should be able to gradually go up to 500-600 and see very good growth, without having issues.
- Thread starter
- #225
Gutter444
Well-Known Member
I will definitely have to watch by carefully first sign of anything going wrong I will be asking. I was surprised to ppm was higher I know I used more nutrients this time then last but I used more ro waterMeasuring often is a great method for tracking the rise in EC (or ppm), which naturally occurs as the plant transpires (and from evaporation from the media)
Once it gets too high, the plant can’t produce enough sugars to make the concentration higher inside the roots than outside them, and water is pulled out of the plant to try to dilute the solution outside the roots (this is how osmosis works). “Nute burn” is actually dehydration of the leaf tips as a result of this loss of water.
More seriously, transpiration virtually stops, and then the plant can’t pull needed nutrients to the upper parts (like actively growing shoots and leaves) that need them.
Trust me - I know from personal experience that you don’t want to go down the path of high ppms. You should be able to gradually go up to 500-600 and see very good growth, without having issues.
- Thread starter
- #226
Gutter444
Well-Known Member
Okay so I think I have an issue with one on my plants. In wondering if it's a calcium deficiency? And if I should add in some more Cal mag? What do you guys think? Here are some pics? @FelipeBlu is this the toxicity you were talking about?
Attachments
- Thread starter
- #227
Gutter444
Well-Known Member
I've also been doing some reading and I've been adjusting my pH everyday as it wanders up to around 6.4 on that plant so I adjust it back to 5.8 the more reading I've done tells me calcium can be locked out below 6.2 and a little higher pH during veg is okay. From now on I am only going to adjust pH if it falls out of the 5.5 to 6.5 range on all 3 plants
- Thread starter
- #228
Gutter444
Well-Known Member
Do you think I should add another 5-7.5ml of Cal mag to that Rez though?
Yes, this is what I was talking about.
With an initial ppm of 1000, the one thing that isn’t needed is to boost it even higher by adding CalMag. It does look like Ca and/or Mg is deficient, but it is likely because of excess potassium, which, as another cation, competes with calcium and magnesium.
I would make up a new rez solution at about 500-600 ppm, and bump the CalMag a bit.
Good luck!
With an initial ppm of 1000, the one thing that isn’t needed is to boost it even higher by adding CalMag. It does look like Ca and/or Mg is deficient, but it is likely because of excess potassium, which, as another cation, competes with calcium and magnesium.
I would make up a new rez solution at about 500-600 ppm, and bump the CalMag a bit.
Good luck!
All nutrients interact with each other, as shown on this figure:
- Thread starter
- #231
Gutter444
Well-Known Member
I just find it odd because the ppm was at 700 on that plant all last week and it was fine. Of the three it has the lowest ppm of 950 which is down from where it started on Thursday at 1050. I'll go back to what I mixed for her the time before last again with a bump up of Cal mag and adding in the hydro sparkle and rhizo blast should be around 600-700ppm
Also, the pH is drifting up because the plant is taking in cations (plants will get carried away and overdose on potassium), which results in the release of OH- from the roots.
- Thread starter
- #233
Gutter444
Well-Known Member
So with that then, am I right to just leave the pH and only adjust it if it goes outside the 5.5 to 6.5 range? Or should I adjust it back to 5.8 Everytime I see it drift off?
Adjust as necessary to keep it around 5.8-6.2
@Pennywise - are you still watching? You have more experience with DWC than I.
@Pennywise - are you still watching? You have more experience with DWC than I.
- Thread starter
- #235
Gutter444
Well-Known Member
If I didn't do a Rez change will this continue? Or will the plant fight through it?
I'm going to do one just want to keep the water and nutes from this batch and maybe try again with it next week. Feels wasteful to dump it out
I'm going to do one just want to keep the water and nutes from this batch and maybe try again with it next week. Feels wasteful to dump it out
You could try diluting it to 500.
- Thread starter
- #237
Gutter444
Well-Known Member
I did the Rez change ppm is now 700 I kept the water I will dillute it and use it if I need to top up any of the three plants or if I still have it in a week I will try and re use it.
- Thread starter
- #238
KCCO 77
Well-Known Member
Hey man what going on?? I hope all is good. I need to read through your journal to get the full pic. I can’t this moment because I have company. All I can say now is ppm dropping and ph rising are good.
If I was reading correctly @FelipeBlu was saying to dilute the mix by cutting out some A/b and replacing the ppm with a cal/mg bump To try to stabilize the ph and keep the EC in check wile addressing a deficiency . Just jumping in on these last few posts but he’s probably on the correct path.
I can say in my veg set up the ph rises every day with the ppm dropping.
I knock my ph down to 5.5 then let it slide to 6.0 and knock it back down. This happens every day for me in veg no matter how I try to tailor my mix.
The only thing that stops this dead in its tracks is a mix that is to strong.
I run my flower mix at a ph of 5.9 until preflower then 6.0 until harvest.
I will be back. Play safe and enjoy
- Thread starter
- #240
Gutter444
Well-Known Member
I'm great man just spending the day with my daughter playing a new board game we got. Jumanji! She actually thinks monkeys are going to come destroy the house.
I have had the same thing with pH every day it drifts upward to 6.4ish I bring it back down to 5.8 maybe I will start going down to 5.5 so that it stays a little lower. I did do a Rez change to have less nutes and a little more ppm. The details of that are above. Would love your input when you have a chance to read it. Have fun with your company!