Please Help ID This Deficiency

[KushConnoisseur]

Out of 16 various plants, this is ONLY occurring in some lower leaves of my platinum cookies. I feed 5-7 ml/gallon cal mag along with the heavy 16 line. About 900 ppm total fed daily in coco. Week 1 of bloom. What is it and how do I correct this?

 

[papaduc]

900ppm at what conversion rate? Always use EC when trying to get help or it's pointless even mentioning the ppms.

And why so much calmag? What's the thinking behind that?

 

[KushConnoisseur]

900ppm at what conversion rate? Always use EC when trying to get help or it's pointless even mentioning the ppms.

And why so much calmag? What's the thinking behind that?

500 conversion rate so 1.8 ec. 5ml/gallon of cal mag in coco is standard so I don't see how I'm using an excessive amount? I was getting some spotting and light green between leaf veins on some plants as well as leaf folding and that went away once I added more cal mag.

 

[papaduc]

It's an excessive amount if you're running full strength nutes alongside it.
5ml per gallon is to treat a deficiency.

If you need to add extra calmag in to bring up the N or Ca .. then just put 0.2ec in on top of 1.0ec base, but bring the overall strength down to avoid the burns.

 

[hush]

What's your pH? Looks like a Ca deficiency to me, but hard to tell from that one pic. It's helpful when you can offer more than one pic. But that looks like Ca def. Maybe your pH is off?

 

[KushConnoisseur]

It's an excessive amount if you're running full strength nutes alongside it.
5ml per gallon is to treat a deficiency.

If you need to add extra calmag in to bring up the N or Ca .. then just put 0.2ec in on top of 1.0ec base, but bring the overall strength down to avoid the burns.

I've even told that particular cut (dhn platinum cookies) is a calmag hog. Last week the leaves were folded upwards and getting light between veins so I sprayed them with 1/2 tsp of Epsom salt and a gallon of water and it seemed to cure the problem. I have gorilla glue #4, forum cut gsc and bubba kush plants in the tent as well and they look perfect. I will try reducing the base/additives and see if this helps.

What's your pH? Looks like a Ca deficiency to me, but hard to tell from that one pic. It's helpful when you can offer more than one pic. But that looks like Ca def. Maybe your pH is off?

I keep my ph at 5.8ish and check/adjust daily before feeding. I only attached the one picture because that's the only leaf that looks like that. There's only one or two leaves out of all my plants that are affected like that.

 

[DoubleDDsNuggs]

Calcium is more available at 6.0 ph but perhaps lock out?

 

[KushConnoisseur]

I should also mention that I foliar with Heavy 16 professional foliar nutrient every few days which contains 4 forms of calcium and a couple forms of magnesium. I was under the impression that a calcium deficiency shows more towards the top leaves and not the bottom like mine.

 

[papaduc]

You haven't got any major problems mate, but one thing you should be aware of is that when you're running high ppms, things like heat stress etc are exacerbated and the potential for problems increases, and for no benefit.

 

[KushConnoisseur]

You haven't got any major problems mate, but one thing you should be aware of is that when you're running high ppms, things like heat stress etc are exacerbated and the potential for problems increases, and for no benefit.

Made a new res tonight at around 1.3 ec. After adding my regular additives at the lowest recommended levels (calmag, AN big bud, H16 prime, H16 fire, drip clean, silica), my ec was .8. So this allowed me only 2ml/gallon of H16 base nutes as opposed to the 8-15ml recommended, to bring my ec to 1.3, meaning most of my ec is additives. This doesn't seem right?