Calcium Deficiency??

[tbake4420]

I know the lights make it hard to see but they almost look like rust spots on fan leaves only. The closet thing I could find that resembles this is a calcium deficiency. Plants are grown in Pro Mix and I am using Cogos Part A and B at 1/2 strength along with Cal/Mag. Water is PHed to between 6.0 and 6.3. Any thoughts?

[Flockshot]

No expert here, but it looks more like magnesium to me. These leaves are being damaged between the leaf veins where calcium hits the leaf everywhere including the veins. Just my opinion, and again no expert here.

[Redwasp]

Wish I knew more. That could be alot of things. Are those autos?

[tbake4420]

No, not autos they are Gorilla Glue #4 or at least that is what I was told. Hell they could be anything how would anyone be able to tell between the 10 million strains there are today, lol

[Redwasp]

Was just asking because I have some autos that did that at 700ppm intake flow. They are still producing big colas. But some can be picky.

[Mr.furley]

Can you tell me about your watering practice and pot size?

[Redwasp]

D.A.A.S.69 gibe me a minute or two. Ok a few hours. Ask dass better at autos than me.

[D.A.A.S.69]

I don't know what type water 4420, is using or how much cal-mag he's using, but the best I can tell in those pictures it looks like Magnesium def. to me just like Flockshot said.
I'm not good at diagnosing unless the pictures are in natural light, and I ain't to good then.
Could be root problems ,like @MrFurley thinks, like I said ,good light pictures helps alot.

[PRIMO]

Have you been giving cal-mag all along? How much?,how often?. Those leaves will not return to health. I would give a good flush, then finish flush with neuts and cal-mag, then start watching the new growth for signs of improvement.

[tbake4420]

The plants are in a 5 gallon pots.

When watering I water till I get about 10 % run off ( 1.2 -1.3 gallons per container) And then water again based on the weight of the pot. Normally between every 3-5 days. Sometimes they go 6

I mix 5 mil of Cal Mag per gallon along with Cogos Part A and B into RO water and PH to 6.0 - 6.3 and the plants have been getting Cal Mag the entire time.

Didn't start noticing the issue until the plant was to flipped to 12/12 and it is the only one doing it.

The plant is a gorilla glue #4

Lights are 1000 watt Phantoms but are currently set to output 600 watts, temps are 68 (lights off) 75-77 (lights on) and Co2 burner working at 1500 ppm when lights on

[tbake4420]

Also last night I noticed the affected leaves are now drying out and getting crispy and the edges are folding up.

[Mr.furley]

Cut them off. They will not return

[Mr.furley]

I agree with the others that looks like magnesium, I also agree that it needs a flush. I think that you have lockout, calcium and magnesium need each other to absorb and your pH is probably off in your medium. I don't grow with Pro mix but I've talked to a couple people about it, it's a moss ,Coco, vermiculite, perlite mix and should be treated as Coco grow. I would
1. Check my runoff pH
2. Flush the plant According to which direction you need to go with pH
3. Restart your calcium magnesium watering.
good luck.

[tbake4420]

Another thing that just hit me is when the plant was in veg I mixed nutes and cal mag at 1/4 strength and then in flower at 1/2 strength.

The plant has only received 1 feeding at 1/2 strength since the flip. Could it be the increase in cal mag just hasn't caught up yet? The plant was flipped a week ago and did not show this symptom in veg.

As far as the pro mix it does not have any coco in it, just the other other stuff you listed. They do sell pro mix with coco but I have not used it yet. I was told to run it as hydro grow since I am adding all the nutes to it. Is that correct?

I will test runoff tonight as they should need watering then. What is the correct ph for the runoff? I think I read somewhere 5.5 to 6.5?

[Mr.furley]

If your runoff pH is not way out of whack say round 6.0, then yes I would agree with your calcium magnesium Theory I've noticed a big shift in nutrient need at the flowering flip with certain strains before. If you have a way to check PPM of runoff that would give you a better idea of what's really going on.
Your medium is in a sense a hydro system but it is a soilless medium your roots are not submerged in water all the time but treated like Coco as adding nutrients and water a couple times a week. Therefore I would suggest the soilless medium pH chart. Calcium and magnesium absorbed best together at 6.3 in soil less grows I find. IMO
Keep us posted what you find

[tbake4420]

Ok so I watered last night with the same nutrients Cogos Part A and B and Calmag.

I mixed 5 mils (half strength) of each into 20 gallons of water and adjusted the ph.

The end result was a PH of 6.3 and PPM of 1020

Watered each plant until I got roughly 10% run off ( 1.2 gallons)

I then tested the runoff on 1 of each strain in flower and 1 of the plants in veg and the results have me stumped

The plant exhibiting the brown spots (Gorilla Glue #4) showed a PH of 6.0 and PPM of 1920

PLANTS WITH NO BROWN SPOTS AND LOOK HEALTHY

Gold Leaf PH = 5.5 PPM = 4390

Chernobyl PH = 5.2 PPM = over 5000+ (tester only goes to 5000 ppm)

California Dream PH = 5.3 PPM = 5000+ " "

Gorilla Glue in Veg PH =5.6 PPM = 5000+ " "


What I don't understand is how could the PPM be 5 times higher coming out than it is going in especially since I am only mixing at 1/2 strength. Tested with Blue Lab Combo Meter

Shouldn't the plants with a PPM of 5000+ be burned to hell, but yet the only plant that looks bad is the plant with brown spots (PH 6.0 and PPM of 1920)

The only thing I can think of is that the run off mixed with the dried up residue that was in the saucer from the previous watering.

Anyone have any ideas?

Are the PH levels OK?

Are the 5000+ PPM OK?

Anybody else using Cogos Part A and B having similar issues?

[Mr.furley]

Wow, there's something wonky with your ppm's. They should be running between 800 and 1200 max. I would suggest at this point to focus on the sick plant not the numbers you're seeing, but what the difference is between your Healthy plants and your sick plant. if you look at that it says your pH is higher and your nutrients are too low compared to your Healthy plants. I would still give it a good flush, double-check your PPM meter for calibration and method of checking your runoff for errors. I may be off base but that's how I'd approach it, like I said I haven't grown in promix so I don't know for sure. I hope this helps you get a handle on your problem plant.

[PuravidaC]

I have the same issue with my autos. Hope you find out what's going on! I flushed mine a couple of weeks ago and it seemed to help but now it's back with a vengeance. Mine are still a few weeks from harvest and I'm hoping to limp to the finish line.