I get this problem regularly in hydroponics, not sure of the cause... (pics provided)

It doesn't seem to line up with any of the deficiencies I've read about, I'm wondering if anybody has any insight.
My pH is generally between 5.6-6.0
tds between 1500-2000ppm.
It only seems to happen to older & mid growth leaves.
The leaves are at least 2' away from my 600w HPS lamps.
It has happened in most of my previous grows, regardless of nutrient brands used.
I am currently using Botanicare's CNS17 Nutrients, (best results I've seen so far, of any brand I've tried)
I also use Cal-Mag, Liquid Sand, Fulvic Acid, and H2O2 to keep my system healthy.
It isn't a big problem, my plants aren't dying, it's just a minor annoyance I'd like to resolve if possible.
Not all the plants are affected, but are all grown in the same aeroponic unit.
If anyone who can tell me what's going on, I'd appreciate it.
It also doesn't appear to be splash related, as most of the plants that show the problem aren't near my fill point.

Thanks for the help.

you're frying the shit out of your plants. 1300ppm is pushing it let alone 1500-2000

I never go over 1350 and that's pushing it.

^ ding ding ding ding chicken dinner. cn

acidking said:

tds between 1500-2000ppm.

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What are you fucking crazy?!?!?!?

marc88101 said:

I never go over 1350 and that's pushing it.

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Especially in a true aeroponic system using fulvics.

Id say the ppm is high,but also..how close are your fans to the plants? I get leaves that get that deterioration sometimes and theyre always the ones right in front of the fans. I always figured it was from the leaves whipping back and forth against each other (and I run at a lower ppm so I know it isnt that)

Thanks for all the replies, I'll dial down the nutes... BustinScales510, you are actually correct as well, the only plants that exhibit this, on inspection, are the ones closest to the fans.

It's actually been a long time since I've researched recommended TDS levels, maybe 15 years. From what I remember, the thinking at that time was that although some plants could handle 3000ppm, it was best not to go above 2500, so there I was thinking my 1500-2000 was well within the acceptable range for mid to late flowering. That will learn me to keep up on current best practices.

That said, most of my plants don't seem to be affected by the high nute levels, it's always just been a minor problem on a few plants, and never seemed to adversely affect yield... it just always kind of bugged me.

Also, a clarification, I generally mix to about 1500ppm, the reservoir will occasionally climb to 2000 over a period of several days, if the weather is very dry out, RH of less than 30%, but otherwise the TDS remains pretty stable around 1500ppm. I will however cut it down to 1000ppm, and go down from there if I still see these signs of nute burn.

Hydro tends to need a lot less than soil because the plant has immediate access to the nutes. Many very successful hyrdo growers don't go over 800-1000ppm (.5 conversion) in flowering.

i never go above 1000ppm in my aero and 600 in dwc. just wasting nutes at that point and harder to get a true reading on any problems.

Don't forget to minus the ppm of your water from the nutes.

adower said:

Don't forget to minus the ppm of your water from the nutes.

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My tap water is generally in the 250ppm range, so my nutrients and other additives (pH down, Silicon, Cal-Mag, Fulvic acid, H2O2) were adding 1250ppm.

i love living in canada i get a big container fill it from my tap add my nutes and boom go to good no ph testing needed its always 6.0 never changes

superstoner1 said:

i never go above 1000ppm in my aero and 600 in dwc. just wasting nutes at that point and harder to get a true reading on any problems.

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Hi superstoner1 , is that base nutes or + calmag too at 600 ppm dwc.

Zmon said:

Hi superstoner1 , is that base nutes or + calmag too at 600 ppm dwc.

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total ppm. tap is 110.

Superstoner1, so your adding 490ppm, so your looking at just under 1.0 ec. How many ml per liter base nutes are you using. How big are your ladies on average.

i have a great recipe in my thread, my three stages of flower. but with my dwc buckets i just get premixed nutes from whatever aero flower unit is in the same stage of the plant in dwc. i will pump out about 3gal from flower res and add 2gal tap water and done. i do not really spend any time on my dwc, they are just extra plants i put in to flower and they just get side light from flower units, but 2 extra plants is 4-6oz and adds up nicely.

Do you have to dial in, in aeroponics

if you ask me, growing is about dialing it in. from temp and rh to nute ppm and air circulation, plus many other variables. thats why in my same flower room i went from more plants getting less harvest to less plants and much more harvest. it takes time, attention and common sense. i just had my 101st harvest and have had time to do this and test options, but the recipe is solid. a bunch have tried it and loved it.

I'm pretty sure I read it this summer I'll reread it though, thanks superstoner1. Acidking you running aeroponics or deep water?