Calcium problem?

OldMedUser

OldMedUser

Well-Known Member
J.James said:
At a PH of 7, you would have some Iron Deficiency showing in the leaves and a looks like light green striping and spots in the leaves like this
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That pH chart doesn't mean that at pH 7 iron will become unavailable just that it is less available at any pH not optimum.

Iron deficiency starts in new growth and the leaves go yellow from the petiole out to the tips. That leaf pic you supply looks more like low N or Mg which starts in older fan leaves as both are mobile nutrients and can be stolen by new growth that remains healthy until the condition becomes chronic. I could possibly be low Fe but by the time old fan leaves go chlorotic from that the top of the plant will be dead.

Fe on the other hand like most micronutrients are immobile and their lack affects new growth first. High pH like 7.5+ will start to lock out many.

Iron.jpg

JorgeCervantesCannabisDeficiencyChart.jpg
 
J.James

J.James

Well-Known Member
budman410 said:
I’m close to week 7 in flower a couple more weeks they are getting cut down so I guess I’ll keep it simple. I’ll do a flush. I use tap water, drop the ph to 6.2-6.5. It was a 600w hps over them. Now it’s 12 132 Hlg 3k ran at 520w. When I first transplanted I used water for first 2 weeks. Then 5 gallon watering with 15g jacks, 10g cal, 5g of Epson.
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Do you mist the plants? I would flush the medium with 6 - 9 Gallons of water or until your runoff is near clear. Wait till the plant dries out and water with Jacks only, If using tap water Cal/Mag shouldn't be needed, If using RO water then add the Cal/Mag back half strength. You are close to harvest so don't over think it. just limp the plant along until then. I find that FFOF is very harsh when used straight and try to cut it by at least 1/3 to 1/2 with Happy Frog and Perlite. Also, a watering schedule of alternating nutrients and plan water will help. "Plain Water, Feed, Plain water" if watering 3 times a week. The soil will help buffer the PH down naturally but I would still try to stay around 6.5 just to be safe.
 
B

budman410

Well-Known Member
J.James said:
Do you mist the plants? I would flush the medium with 6 - 9 Gallons of water or until your runoff is near clear. Wait till the plant dries out and water with Jacks only, If using tap water Cal/Mag shouldn't be needed, If using RO water then add the Cal/Mag back half strength. You are close to harvest so don't over think it. just limp the plant along until then. I find that FFOF is very harsh when used straight and try to cut it by at least 1/3 to 1/2 with Happy Frog and Perlite. Also, a watering schedule of alternating nutrients and plan water will help. "Plain Water, Feed, Plain water" if watering 3 times a week. The soil will help buffer the PH down naturally but I would still try to stay around 6.5 just to be safe.
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Yea that’s why I figured to to not feed them for a couple weeks, they were started and grown in roots organic before flowering. And ok thanks I’ll try to flush them tonight
 
C

CannaCountry

Well-Known Member
Ca deficiency will typically show itself on the leaves closest to your light source and in the same fashion / spots as you are experiencing. Sometimes if your pH is off or if you have too much of other elements going on, the Ca will get locked out. Several rounds ago I was chasing around what I thought were issues by adding additional Mg which in turn locked out my Ca and I experienced some of the same things as you, using the same nutrients. As far along as you are, I wouldn't sweat it. I'd simply make notes for your next go round and if you're running the same strain again, you'll most likely know what to do to avoid this in the future. Good luck.
 
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