All tops are turning yellow

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Mobileaudio25

Active Member
I have an AK 48 that is the main plant having the most issues. It's from a clone from a buddy and for some reason all of the tops are turning yellow and the leaves aren't feeling that normal. I just lost 9 of these that were 3 weeks old from clone. Every shoot and top turned yellow and the leaves got hard and withered up and died. I'm not sure why but my other plants all have slightly yellow tops so it must be something in doing. Some leafs not a lot are clawing and are yellow on the ak48. I know it's not just light green new growth. Others are Gogi og and a jellybean cross.

-Canna Nutrients
-Canna coco
-Indoors 65-75 F 600w cooled MH
-Water when pot loses some weight, roots are great I use mykos and azos sometimes as well as rhizotonic.
-Veg stage about 1.5 months some from seed some clone (ak48)
- RO water, 5ml calimagic, 3ml rhizo (sometimes), 3ml A + B nutes. PH to 5.8
PPM = 675 . converted to EC is .95
- Foilar weekly with spray n grow or nitrozyme (plants love it)
-Mykos with transplant, azos dose sometimes.

Any clues?
I took a 2year break from growing but haven't changed anything from last time. Thanks for the help
 

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*BUDS

*BUDS

Well-Known Member
I think its too much light or nutes. Try again raise the light and only use canna vega for now. Th yellow ones are stressed and probably wont come back.
 
M

Mobileaudio25

Active Member
*BUDS said:
I think its too much light or nutes. Try again raise the light and only use canna vega for now. Th yellow ones are stressed and probably wont come back.
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I was wondering if it could be too much light... I don't think it's too much nutes. I've used this same feeding schedule before with great results. My 600w cool tube is about 14-20 in away from most tops do you think that's too close? The cool tube doesn't get hot at all I can touch the glass no problems
 
trippingballs

trippingballs

Active Member
I would look at your water. Did you change your water since last time? Did you change your soil? Are you on an aquifer that changes it's mineral composition depending on seasons? I agree it looks like an Iron problem, either too much or too little. If your water is high in manganese that can play havoc with your plants iron intake.
 
M

Mobileaudio25

Active Member
trippingballs said:
I would look at your water. Did you change your water since last time? Did you change your soil? Are you on an aquifer that changes it's mineral composition depending on seasons? I agree it looks like an Iron problem, either too much or too little. If your water is high in manganese that can play havoc with your plants iron intake.
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No same water. I'm using an R/O filter that is filtering my tap water. I'm using the same coco and nutrient line as well. Only thing I've added in is azos and that just works with the roots. My roots look better than they ever have. No aquafier either. Do you think I should try flushing? There shouldn't be much salt buildup they were transplanted about a week and a half ago. I don't don't want to lose anymore due to this. First time I've ever lost any and it's killing me lol
 
M

Mobileaudio25

Active Member
bobtokes said:
you say your PH ing @ 5.8 is that constant ?
i always vary mine between 5.8-6.3 so i dont lock out MG and other nutes
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Yeah that's constant. Almost always exactly ph'd to 5.8. At least at time of water I'm pretty sure the ph rises slightly before the nutes are absorbed
 
M

Mobileaudio25

Active Member
No definitely not watering too often. i honestly think it's a nute lockout or over feeding. I feed lightly though so that makes me think it's a lockout.
 
SheeshM

SheeshM

Well-Known Member
Seems like you are doing everything right, but here are a couple of things to check. It's tough to see the container sizes. Are the pots big enough for the plants? They're not root bound are they? How is the drainage? Are the roots getting enough O2? What about bugs? Have you checked well, including under the leaves? How is your humidity? The only other thing I can think of is the foliar spraying. Could adding more nutrients with foliar spraying result in over fertilizing (like you mention above)?. Probably a good idea to do a light flush then restart nutrients at 1/4 to 1/2 full strength. Maybe skip the foliar spray for a few feedings until they stabilize. Good luck.
 
M

Mobileaudio25

Active Member
SheeshM said:
Seems like you are doing everything right, but here are a couple of things to check. It's tough to see the container sizes. Are the pots big enough for the plants? They're not root bound are they? How is the drainage? Are the roots getting enough O2? What about bugs? Have you checked well, including under the leaves? How is your humidity? The only other thing I can think of is the foliar spraying. Could adding more nutrients with foliar spraying result in over fertilizing (like you mention above)?. Probably a good idea to do a light flush then restart nutrients at 1/4 to 1/2 full strength. Maybe skip the foliar spray for a few feedings until they stabilize. Good luck.
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They are decent size plants but are not too big for 5gal. They were just transplanted a week or so ago so drainage and pot size should still be ok. Roots looked excellent on every plant even the ones I had already lost. I will back off the foilar spray and follow up with a good flush.

Do you think fluctuating ph is a good idea. Maybe water to 5.6 then 6.0 then 5.8?
 
ChaosHunter

ChaosHunter

Well-Known Member
M

Mobileaudio25

Active Member
ChaosHunter said:
It's a good idea to let the pH cover a range instead of always adjusting to the exact same pH number. If you look at the chart there is no way to get everything with one PH number unlike soil. Too low and cal mag is out, too high and Maganeese is out. Make sure your PH meter is calibrated as you can see a few points one way or the other makes a difference.

http://www.growweedeasy.com/sites/growweedeasy.com/files/pH-nutrient-deficiency/hydroponics-ph-chart-marijuana.jpg
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So since I'm growing in coco and my ph is always at 5.8 do you think I should lower to 5.6 or up it to 6.0 for my flush? I think I'm going to flush 1/3 strength with 5ml per gallon of calmag.

I think my ph rises a little bit once in the pots before the roots absorb the nutes because I mix nutes with water, ph and water right away. I've heard ph will rise some when sitting. Not sure if this is always the case with R/O water
 
ChaosHunter

ChaosHunter

Well-Known Member
Mobileaudio25 said:
So since I'm growing in coco and my ph is always at 5.8 do you think I should lower to 5.6 or up it to 6.0 for my flush? I think I'm going to flush 1/3 strength with 5ml per gallon of calmag.

I think my ph rises a little bit once in the pots before the roots absorb the nutes because I mix nutes with water, ph and water right away. I've heard ph will rise some when sitting. Not sure if this is always the case with R/O water
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Look where Ca and Mn fall on the chart. If you consistently PH at 5.8 you locking out Mn, that is if your PH meter is calibrated.
 
Delta-9Pyromaniac

Delta-9Pyromaniac

Well-Known Member
Like mentioned by chaos hunter
For hydroponic growing setups (as well as soilless growing mediums like coco coir) an optimum root zone pH is between 5.5 and 6.5. This is slightly more acidic than the optimal root pH for growing in soil.

It's a good idea to let the pH cover a range instead of always adjusting to the exact same pH number."
Took that from the link provided http://www.growweedeasy.com/ph#hydroponic-soilless-pH
Hope this helps. Make sure to cover a range not specific ph
 
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