What deficiency is this?

[DirtyHarry1252]

Hi! Anyone have a keen eye on identifying deficiencies? I want to catch it now while it's starting. This is an jack herer autoflower so I don't have much room for mistakes! Growing in a coco,perlite, Worm casting mixture with cb organics all purpose dry fertilizer for the first 30 days, then I added their bloom dry fertlizer. Then 3 days ago I gave it some molasses, great white, and some more potassium from an organic kelp extract(0-0-16)(1/4 tsp in one gallon). Today is day 53 and some yellowing of the leaves popped up...

 

[MountainGreenz]

It’s a toss up between sulfur or a iron deficiency. I would leans towards sulfur deficiency because the whole leaf is eventually turning yellow. With a iron deficiency the leaf veins will stay green. Also look for woody stalks and purple streaks along the stalk which will happen with a sulfur deficiency.

 

[durbanpoisoner]

Just so I understand, you're growing in coco with dry organic amendments?

 

[Southernontariogrower]

Do you check ph? Should, bc its main reason for any def. I almost want to say you need to add boron to nutes. Does your feed have it? Most high end nutes do have, but always acceptions.

 

[DirtyHarry1252]

Just so I understand, you're growing in coco with dry organic amendments?

Yes I am Durban poison.

 

[DirtyHarry1252]

Do you check ph? Should, bc its main reason for any def. I almost want to say you need to add boron to nutes. Does your feed have it? Most high end nutes do have, but always acceptions.

I will have to check through the nutrients to see if it has boron. My tap water ph is 7. Just checked it. But I don't have any means of checking the soil ph or runoff because my plant is in the ground.

 

[DirtyHarry1252]

It’s a toss up between sulfur or a iron deficiency. I would leans towards sulfur deficiency because the whole leaf is eventually turning yellow. With a iron deficiency the leaf veins will stay green. Also look for woody stalks and purple streaks along the stalk which will happen with a sulfur deficiency.

Good eye, would you perhaps also think it has to do with calcium or magnesium due to the fact I havnt added any until I saw the yellowing? I've heard coco has issues with that....something to do with cation exchange?

 

[DirtyHarry1252]

These 3 pictures are a week prior to seeing yellowing. I did also notice that alot of the leaves were losing their dark green color, and having a paper feel to them....

 

[MustGro]

Hi! Anyone have a keen eye on identifying deficiencies? I want to catch it now while it's starting. This is an jack herer autoflower so I don't have much room for mistakes! Growing in a coco,perlite, Worm casting mixture with cb organics all purpose dry fertilizer for the first 30 days, then I added their bloom dry fertlizer. Then 3 days ago I gave it some molasses, great white, and some more potassium from an organic kelp extract(0-0-16)(1/4 tsp in one gallon). Today is day 53 and some yellowing of the leaves popped up...View attachment 4970458View attachment 4970456

Did she look good 3 days ago before you, “Then 3 days ago I gave it some molasses, great white, and some more potassium from an organic kelp extract(0-0-16)(1/4 tsp in one gallon).”?
In the second pic the pistils look like they’re burning at the tips. I’m thinking your last mix was too hot. Organic potassium shouldn’t be available quickly, molasses would have to be a high dose to mess things up, not sure on great white. Did you measure ppm/EC of that mix?

 

[MustGro]

Yeah she looked good in the old pics, maybe a little lime green but good.

 

[PadawanWarrior]

Not a fan of coco and organics. But stop giving it all that. And no more molasses. Just water for now.

 

[DirtyHarry1252]

Did she look good 3 days ago before you, “Then 3 days ago I gave it some molasses, great white, and some more potassium from an organic kelp extract(0-0-16)(1/4 tsp in one gallon).”?
In the second pic the pistils look like they’re burning at the tips. I’m thinking your last mix was too hot. Organic potassium shouldn’t be available quickly, molasses would have to be a high dose to mess things up, not sure on great white. Did you measure ppm/EC of that mix?

She's been looking kinda lime green for the last 2 weeks. And only one small yellow leaf. After the feeding a couple more yellow leaves starting popping up(what was pictured in first post). I mixed 1/4 teaspoon of great white, one TBLSP of molasses, and a 1/4 teaspoon of the Kelp. I did not measure it the ppm/ec. I'm going to start measuring on my next watering now that you mentioned it. I just checked My tap water a few minutes ago and its at 480 ppm.

 

[DirtyHarry1252]

Not a fan of coco and organics. But stop giving it all that. And no more molasses. Just water for now.

Would one tablespoon per gallon of molasses really hurt the plant? My intention on using it was to feed the beneficial fungi.

 

[PadawanWarrior]

Would one tablespoon per gallon of molasses really hurt the plant? My intention on using it was to feed the beneficial fungi.

It's not good. Molasses feed microbes, but they'll live fast and die young. The plants roots give off it's own sugars, so I want the bacteria to be focused on letting the plants feed them than to force feed them.

Molasses also lowers the soil pH.

It's best in teas, but a little here and there very rarely isn't horrible.

And COCO and ORGANICS don't usually work well together!

 

[xtsho]

Why would you add another potassium source after adding a bloom fertilizer that would have all the potassium needed? I doubt that you have a lack of anything. More than likely things are not working very well together.

 

[DirtyHarry1252]

It's not good. Molasses feed microbes, but they'll live fast and die young. The plants roots give off it's own sugars, so I want the bacteria to be focused on letting the plants feed them than to force feed them.

Molasses also lowers the soil pH.

It's best in teas, but a little here and there very rarely isn't horrible.

And COCO and ORGANICS don't usually work well together!

Gotcha! I'll hold off on the molasses. And interesting! I never heard that coco and organics don't do well together. What is the reasoning behind that? And if it matters, about 1/3 of the soil mixture is worm castings.

 

[DirtyHarry1252]

Why would you add another potassium source after adding a bloom fertilizer that would have all the potassium needed? I doubt that you have a lack of anything. More than likely things are not working very well together.

The dry organic bloom fertlizer by eb organics is not strong. So I figured if I hit my plant with a small dose of extra potassium it could help the buds

 

[PadawanWarrior]

Gotcha! I'll hold off on the molasses. And interesting! I never heard that coco and organics don't do well together. What is the reasoning behind that? And if it matters, about 1/3 of the soil mixture is worm castings.

I just never see it go well for the people who try it, and it's not the best medium for organics. Peat Moss is better. Read this and you'll see why. C:N ratio and CEC are better with peat for example.

Peat vs Coco Coir

This can be a hotly debated topic among growers as to what's the best media for growing plants. In this article, I'll weigh in with my opinion on the subject as there are Pros and Cons to both.

www.kisorganics.com

 

[DirtyHarry1252]

I just never see it go well for the people who try it, and it's not the best medium for organics. Peat Moss is better. Read this and you'll see why. C:N ratio and CEC are better with peat for example.

Peat vs Coco Coir

This can be a hotly debated topic among growers as to what's the best media for growing plants. In this article, I'll weigh in with my opinion on the subject as there are Pros and Cons to both.

www.kisorganics.com

Thanks I'll read this later on tonight and get back to ya