Is this nutrient burn or some deficiency? K??

These girls are 40 days old now and still a bit short but had some N deficiency problems previously, then I thought some nute burn so that stunted them a bit I guess. I removed the previously sick leaves that looked like this:


I am using Sensi Grow and B-52 at slightly less than their recommended 4ml/L's 3/4. So it's like 2.8ml/L... And the ppm is whopping 1000 atm. Isn't that a bit high to be a deficiency? Hence I thought nute burn...
And the pH is around 6.0-6.5 right now and increases little everyday, but I changed the res 5 days ago and these are pH perfect series and general consensus is not to mess with pH using these, so I stopped doing so.

The tip and edge burning (browning) continues but there are also some yellowish spots on the leaves that I noticed so I also suspect this might be Potassium deficiency. What do you guys think?



These spots seem like pH fluctuations? Appeared back when I was adding pH down, previous res change.


This one is a dwarf, stunted when N def happened and never fully recovered. I think it'll die soon :/

UPDATE:

I just checked pH with my 2 cheap meters and they show 6.8-7.0 at the moment.
I know that is really not where it should be but with this recommended "not messing with pH using pH perfect series" thing baffles me... I'm having a hard time trying not to add pH down.

Or maybe I shall increase the Sensi Grow dosages closer to what they recommend to lower the pH and up the nutes I'm thinking, but many people reported that their recommendations might cause a burn. I'm going down either way though

The ppm has already risen to 1020... but I've been thinking maybe these numbers don't mean as much because these nutrients aren't pure N-P-K as what everyone recommends their ppm's based on. Oooof...

lower your PPM to 400- make sure that your PH is in range, and wait till the plant start eating the nutes, if she does increase to 500 and wait again till plant start consuming.

VRZ711 said:

lower your PPM to 400- make sure that your PH is in range, and wait till the plant start eating the nutes, if she does increase to 500 and wait again till plant start consuming.

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So you suspect a burn?
If it’s K deficiency wouldn’t lowering ppm hurt the plants even more?

I just adjusted pH down to 5.8 btw.

vorus said:

If it’s K deficiency wouldn’t lowering ppm hurt the plants even more?

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bro of course its a nutes burn

VRZ711 said:

bro of course its a nutes burn

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But check out the stem of the leaf in second picture please... isn’t that purple stem a red flag for K deficiency? And all those yellow blotches in the browning leaves made me think........

you know what happen when you feed more PPM than needed ? your plants get fried and show all sorts of deficiencies as the roots wont suck up any nutes, they still young plants, take it easy on them. keep your PPM low, and watch if they consume it or not. if they don't just add more fresh water to bring down the PPM.

read about "mulder's chart" before you suspect a lack of specific nutrient.

It feels like not using all the base N-P-K in the simplest form and going with AN stuff to make things “simpler” was a mistake afterall...

seems like theres a grower error here
2.8mls per litre and b52 should not be giving you 1000ppm
youre mixing something wrong. or your water source is crazy high ppm.
theres something off here

Jjgrow420 said:

seems like theres a grower error here
2.8mls per litre and b52 should not be giving you 1000ppm
youre mixing something wrong. or your water source is crazy high ppm.
theres something off here

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I know right! But this is exactly what happens... actually I first started this batch with 2.5ml/L Sensi's + 1.5ml/L B-52 and that gave me like 880. Then I increased the Sensi's to 2.8ish and ppm jumped to 980... and day by day it's been increasing slowly with the pH...

I use RO water, and it starts exactly at 0. Last time though after emptying the buckets as much as I could and refilling them with fresh water, I checked ppm and it gave me a reading of around 100 because of the leftover water in the buckets. Then I added the above mentioned dosage... and here we are. Today after adding pH down (I had to add like 15ml because of the buffers) the ppm jumped up to 1040 but I don't think the affect of pH down in ppm really matters.

I wish there was a seasoned AN user here to give some ideas as to what I should expect.