New Grower What's causing this? Please help [emoji53]

[Mbee242]

Hi guys so this is my first grow. These are auto white widow from pyramid seeds, they are about 10 weeks from cracking the seeds. I've been feeding bio nova auto flower super mix and bio nova pk 13-14 once they started flowering, as well as canna boost and a little bit of cal mag earlier on. I've been feeding and watering about every 3 days once they feel dry. They are in coco. Just over a week ago I noticed they was starting to go a yellow from the outside of the leaf. Any ideas what they are not getting that's causing this please. Getting closer to finishing and I want to get this issue sorted before it hinders the yield. [emoji41]

This seems to be the worst affected one out of them.
I did go to the grow shop to ask them about and they said I need to be giving them cal mag but I was under the impression that this was only really used in the veg period.
Any help would be much appreciated guys. Cheers [emoji3][emoji3]


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[jingo]

That looks like it started mostly as a magnesium problem but it's also starting to be a calcium problem. I use Cal Mag all the way through the grow but I use more of it in flower than I do in veg. I do grow in Coco also.

 

[Mbee242]

That looks like it started mostly as a magnesium problem but it's also starting to be a calcium problem. I use Cal Mag all the way through the grow but I use more of it in flower than I do in veg. I do grow in Coco also.

Thanks @jingo , you say you use more when they are in flower, do you go above the 1ml per litre it says on the bottle? [emoji106]


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[ehlersn420]

That started as interveinal chlorisis, the flesh inbetween the veins on the leaves lighter green followed by the outside of the leaf turning yellow, always remember S.N.A.P supplements then nutrients then additives then ph. Supplements like silica and cal mag are always needed veg or flower. Look up the law of the minimum for plants. When one element the plant needs is lacking every element it uses after that is essentially locked out. So this plant lacking mag, is locking out the nitrogen phos and potassium. I run all my gear through buffered coco, cyco bloom, Aptus mass boost calmg, and trinity catalyst with microbe life and veg with age old grow 9% water sol nitrogen is hard to beat


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[jingo]

Thanks @jingo , you say you use more when they are in flower, do you go above the 1ml per litre it says on the bottle? [emoji106]


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I grow in Coco so that makes a difference. But, I run 1.5 Mill Calimagic per gallon through most of grow and then I run two ml per gallon during flower.

 

[The Elvis]

That started as interveinal chlorisis, the flesh inbetween the veins on the leaves lighter green followed by the outside of the leaf turning yellow, always remember S.N.A.P supplements then nutrients then additives then ph. Supplements like silica and cal mag are always needed veg or flower. Look up the law of the minimum for plants. When one element the plant needs is lacking every element it uses after that is essentially locked out. So this plant lacking mag, is locking out the nitrogen phos and potassium. I run all my gear through buffered coco, cyco bloom, Aptus mass boost calmg, and trinity catalyst with microbe life and veg with age old grow 9% water sol nitrogen is hard to beat


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Good info!!!

 

[jingo]

Never herd of s.n.a.p. great way to remember. Must be somebody who is used to study and memory tricks. Anyway, good info and this is essentially what I wanted to see more pics for. To determine what came first, you can also get yellowing from your pH being off and having iron def

That started as interveinal chlorisis, the flesh inbetween the veins on the leaves lighter green followed by the outside of the leaf turning yellow, always remember S.N.A.P supplements then nutrients then additives then ph. Supplements like silica and cal mag are always needed veg or flower. Look up the law of the minimum for plants. When one element the plant needs is lacking every element it uses after that is essentially locked out. So this plant lacking mag, is locking out the nitrogen phos and potassium. I run all my gear through buffered coco, cyco bloom, Aptus mass boost calmg, and trinity catalyst with microbe life and veg with age old grow 9% water sol nitrogen is hard to beat


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[ehlersn420]

Never herd of s.n.a.p. great way to remember. Must be somebody who is used to study and memory tricks. Anyway, good info and this is essentially what I wanted to see more pics for. To determine what came first, you can also get yellowing from your pH being off and having iron def

PH Is another side of lockout, each element having it's own optimal uptake PH, on cannabis this comes to 5.0-6.5ph depending on the element it's optimal uptake falls within that range, that's why most bagged mediums and soils are 6.0ph buffered, iron deficiency starts with dead splotches until lockout occurs then the leaves autumn off and turn yellow


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[witchyhour]

It looks so much like heat/light stress...

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[witchyhour]

@Itisi

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