Is this a cal/mag deficiency or something else?

T

TheDopeGodfather

Member
Hello all. First post here. I'm hoping you all can help me diagnose my issue. I've got just one plant, 7 gallon pot, day 22 of flower. Fox Farm Ocean Forest/Strawberry Fields blend. I top dressed with Down To Earth 4-8-4 a few weeks ago and coincidentally or not, that's when my issue started.

Problem seems to effect mostly older middle growth. New growth seems ok for now, but it seems to be happening on newer and newer leaves over the last few days.

I'm quite meticulous about my pH and water between 6.3 and 6.9 or so, though my runoff pH is always pretty low (between 5.3 and 5.9 ). I switch between my tap water (dechlorinated) which has a ppm of about 195 and RO water. I have fed Recharge a couple of times, and the last two feedings I've given Cal-Magic at 1sp per gallon of water, but no other nutes other than the top dressing a few weeks ago. The plant is under two SF1000 lights. They were running at 100% but a few days ago I dropped it down to 80% since I noticed a few pistils turning orange at the top.

I'm leaning towards a deficiency, and not nute burn, but I'm so new at this that I really have no idea. Any help you can give me is appreciated. Let me know if you need any other info.

Also should I be removing all these damaged leaves?
 

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Smokey_Treats

Smokey_Treats

Member
TheDopeGodfather said:
Hello all. First post here. I'm hoping you all can help me diagnose my issue. I've got just one plant, 7 gallon pot, day 22 of flower. Fox Farm Ocean Forest/Strawberry Fields blend. I top dressed with Down To Earth 4-8-4 a few weeks ago and coincidentally or not, that's when my issue started.

Problem seems to effect mostly older middle growth. New growth seems ok for now, but it seems to be happening on newer and newer leaves over the last few days.

I'm quite meticulous about my pH and water between 6.3 and 6.9 or so, though my runoff pH is always pretty low (between 5.3 and 5.9 ). I switch between my tap water (dechlorinated) which has a ppm of about 195 and RO water. I have fed Recharge a couple of times, and the last two feedings I've given Cal-Magic at 1sp per gallon of water, but no other nutes other than the top dressing a few weeks ago. The plant is under two SF1000 lights. They were running at 100% but a few days ago I dropped it down to 80% since I noticed a few pistils turning orange at the top.

I'm leaning towards a deficiency, and not nute burn, but I'm so new at this that I really have no idea. Any help you can give me is appreciated. Let me know if you need any other info.

Also should I be removing all these damaged leaves?
Click to expand...
Looks like a Hotspot to me.
 
Dank Bongula

Dank Bongula

Well-Known Member
Looks kinda like a bit of a mag deficiency but the purple color is kinda throwing me off...

Was that the first top dressing you did a few weeks ago? Sometime those top dressings take a little time to start working. If that was your first top dress, the nutes in the soil could have been exhausted and you're possibly playing a little catch-up trying to fix it. But I don't know how long it has been in that 7 gal pot either....

How far away is the light? I have one of those I keep 20in from canopy at 100%

Don't remove those leaves...they will not improve, but you can use them to gauge the progression of this.
 
kingromano

kingromano

Well-Known Member
they were a bit short on calcium
it's minor in your case
1spoon per gal of calimagic must be a bit light

its a classical deficiency when using RO ( i use the water of my AC so i had this pb a few times)

also at high %rh calcium gets harder to absorb for the plant thats usually when the problems appear
 
T

TheDopeGodfather

Member
kingromano said:
they were a bit short on calcium
it's minor in your case
1spoon per gal of calimagic must be a bit light

its a classical deficiency when using RO ( i use the water of my AC so i had this pb a few times)

also at high %rh calcium gets harder to absorb for the plant thats usually when the problems appear
Click to expand...
I hadn't heard that about the higher RH making calcium harder to uptake. At this stage in flower what should my RH be? My tent is usually about 75 degrees and 50% humidity.
 
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