Second go at first grow in new UC system

Question: Is your pH meter calibrated recently?

That pic is not nute burn but a deficiency. I can see a slight burn on the some of the tips but not enough to cause that picture.

Did you say what nutes and additives you are using?

You can't look at it as nute burn because that would appear much differently as you are aware. This on the other hand is a complete burn across all nutrients. The below copy and paste is just one of many examples of the issue. If you don't think my leaves look quite like that then that is another issue and perhaps you are correct about deficiency?

As for my meter I calibrate it once a week and it never drifts more than .05 from true. I just bought a new one to be able to double check accuracy and it came off by .25 for gods sake. I checked them both against GH calibrating solution and I keep all my pens in water now and they stay much more accurate.

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Over Fertilising!
Figure 4 is definitely an over fertiliser problem. The high level of nutrients accumulates in the leaves and causes them to dry out and burn up as shown here. You must flush with clear, clean water immediately to allow the roots to recover, and prevent further damage. The find the cause of the high nutrient levels.

I didn't capitalize that, it came that way, that would seriously be rude.

for the nute burn, you usually see the tips get yellow than brown and if not corrected it will fry the rest of the leaf.

that's why i thought you had nutrient lockout due to too high a EC/ppm and recommended the 24 hr flush

rkymtnman said:

for the nute burn, you usually see the tips get yellow than brown and if not corrected it will fry the rest of the leaf.

that's why i thought you had nutrient lockout due to too high a EC/ppm and recommended the 24 hr flush

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Totally! I agree completely! Last grow when I went to harvest everyone thought I was high as well but it was lush. I agree all strains are different but that different. With the photo below I was at 2.4ec and it was still dropping and I started them as clones at 650ppm.

Are you of the belief that is water is dropping, ec is dropping and ph is rising - that everything is as close to perfect as can be except the EC needs to be upped?

I've always read that is ppm drops, you add it it stays constant, leave it and if it rises you drop ec level.

i preferred for the EC to drop and not stay constant. my thinking for that is that if you do have nute lockout, your EC wont' drop. if your EC is slowly dropping each day, then you know for sure that they are eating.

in your situation, are you sure that each plant is eating making the EC drop? or is it just the healthier plants eating that is dropping your EC? that's why i would isolate the worst plants, flush them and then start back on lighter nutes until they start eating and looking healthier. then pop them back into your system.

2.4 in RDWC holy shit.
I just browsed over the thread, but did you mention that you just use epsom and not calmag?

Here lately if the water drops and my EC is around the same as it was when it was full I don't worry too much about it. If it goes up more than 20 or so I will add water that night. If its down I add nutes @ whatever strength I am at. 600ppm and out of that 200 is calmag and 80 is shit from the tap.
FWIW

I agree about the smaller ones! I'm just to lazy to be honest.

I complain about it a lot but my back is on another level of pain and disability. I can barely deal with what I have to do just with what I got.

I really should move to coco but it's hard now since I spent over 200 building my system but maybe I could sell it.

From now in after this grow I'm not using rockwool anymore. Not that it is the issue but it sucks as a medium in dwc.

Masterblend at 10g per 5gal
Cal/nit at 10g per 5gal
Epsom salt at 5g per 5gal
Silica 1tsp per gallon

This is the nutrient readout for these ratios.

shawnery said:

From now in after this grow I'm not using rockwool anymore. Not that it is the issue but it sucks as a medium in dwc.

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that could be alot of your issues too. did you buy the clones in RW? i used to get a small xacto knife and cut the clones out of the RW and put into all hydroton instead.

your ppms with those nutes looks good. 100 100 200. i'd shoot for 60 of Mg, not 29. maybe bump up your epsom a bit to 1.5 g per gallon and recalculate.

I've been thinking of upping it or I could just add calmag, I have a bottle from before I went the inexpensive dry nute route.

Thanks!

When I was running 1/4 strength with these nutes no wonder I was showing a cal deficiency, right?

shawnery said:

I've been thinking of upping it or I could just add calmag, I have a bottle from before I went the inexpensive dry nute route.

Thanks!

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the cal/mg will up your N too. which wouldn't be a bad thing in veg.

How much do you think? Or I was thinking of just adding it to water until I get 50ppm and then add that much per gallon to the system?

Photo update of plants. They took a few days off but seem to be back to work today. One thing I'm really happy with is the outcome of FIMing. Each one has three to four where there was one and the lateral growth is impressive. Yesterday I decided to do some "clone" pruning by removing 25% of leaf length. My hope was that this would encourage root growth and boy did it. There's a noticable increase in white roots for sure.

I added more hth and still no chlorine smell in my water and I took it to 4ppms of chlorine.

shawnery said:

I added more hth and still no chlorine smell in my water and I took it to 4ppms of chlorine.

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this makes me think something isn't right.

get a more accurate scale like i posted earlier. or invest in a chlorine test kit/meter which are pricey.

3ppm in my res had a very strong chlorine smell.

I screwed up! I was not aware you needed a special meter and was using tds which is not supposed to work yet everytime I added it to a gallon of water the ec rose.

Sorry I'm stupid.

For you to get 3ppms what is your exact dilution rate and dosage?

0.30 grams per 10 gallons is 3ppm.

I'm way under that then! That's just straight hth not a solution dosage right? Obviously you mix it first right?

I'm putting 1g in a solution that treats 70 gallons 3 times. So your saying you use almost 3x as much as I do in three doses as you do in a single dose?

Holy shit I'm running low ppms of chlorine then.

Found another few strange things I've not found in my solution or on my roots. It was just about as black can be but perhaps bark brown. It was as long and thin as a small worm. It was some sort of goop but not slimy at all. I found three of them in different root areas and removed them with a dropper by using its vacuum.

shawnery said:

That's just straight hth not a solution dosage right? Obviously you mix it first right?

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that's just the hth crystals. and i just sprinkle them in my res. they dissolve really quick. and then you should get that strong chlorine smell.