Magnesium/Iron deficiency or toxicity? Plant appears to be short and bushy too...

Strain: Pineapple Express X Gorilla Glue Autoflower from Advanced Seeds
Growing: Indoors, temperature is at a constant 80 degrees inside the grow tent. LED lights are cool to the touch.
Watering Schedule: Alaska Fish Fertilizer every 2 or 3 days, Dyna-Gro Foliage-Pro once a week, using tap water with a PH of 7.0
Growing Medium: Nature's Care Organic Potting Mix, in a 3 gallon pot
Growth Stage: 4 weeks into vegetative cycle

So I was watering my plant today, and 2 of the biggest gigantic fan leaves on the plant had these white spots on them, all the other leaves on the plant was fine..
I don't know if it's nutrient burn, or nutrient toxicity, or a nutrient deficiency.
I have been watering it with Alaska Fish Fertilizer every 2 or 3 days which has an NPK of 10-1-1, with 0 minerals.
And I have watered it twice, about once a week with Dyna-Gro Foliage-Pro with an NPK of 9-3-6, and it also contains minerals listed below:



Yellowing between the veins on 2 of the largest fan leaves on the plant. The tip on the middle of the fan leaf segment also seems to be curling/dying. All the other leaves on the plant seem fine and healthy.
(And those are green onions next to my weed plant, in case anyone was wondering lol)


Super short and bushy at 7 inches tall and the width extends 1 inch past the edge of the pot. Doesn't appear to be stretching much, and it is at 4 weeks, and it is in a huge 3 gallon pot!!!!

I don't know what the issue is but I would think Alaska Fish Fertilizer every 2 or 3 days is excessive.

Kushash said:

I don't know what the issue is but I would think Alaska Fish Fertilizer every 2 or 3 days is excessive.

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I have been watering it with a watered down concentration of Organic Fish Fertilizer since it was 1 week old, and it doesn't appear to have any kind of Nitrogen Toxicity at all.
I think the Organic Fish Fertilizer is like a slow-release Nitrogen, compared to synthetic fertilizers, and the Fish Fertilizer never burns the plant at all.
I have also done the same thing with plants in the past, and they never had any problems. They just grew really huge to like 13 feet tall tho. It looked like a huge Christmas tree lol.

DjSuperman said:

I have been watering it with a watered down concentration of Organic Fish Fertilizer since it was 1 week old, and it doesn't appear to have any kind of Nitrogen Toxicity at all.
I think the Organic Fish Fertilizer is like a slow-release Nitrogen, compared to synthetic fertilizers, and the Fish Fertilizer never burns the plant at all.
I have also done the same thing with plants in the past, and they never had any problems. They just grew really huge to like 13 feet tall tho. It looked like a huge Christmas tree lol.

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Sounds good!
I use it also occasionally and do agree it doesn't seem to be causing a nitrogen problem in your case.
I guess I'm thinking of it in terms of a new grower using too much because it is potent and in your case you seem to be dosing it well.

Problem is autoflower

Feeding soil, 2 to 3 times a week, with a N leaning nutrient regimen may not be suited to this particular plant. Elevated levels of N, while not distinguished by the usual clawing, may still be interfering with various other nutrient uptakes. Your soil looks plenty wet as well. If it were me I'd ratchet back my feed frequency (it's a small plant in a large pot, being fed 2 or 3 times a week in the past...there should be plenty for her to eat). I'd also foliar spray Mg and see if things don't improve in terms of your leaves' coloration. Good luck.

CannaCountry said:

Feeding soil, 2 to 3 times a week, with a N leaning nutrient regimen may not be suited to this particular plant. Elevated levels of N, while not distinguished by the usual clawing, may still be interfering with various other nutrient uptakes. Your soil looks plenty wet as well. If it were me I'd ratchet back my feed frequency (it's a small plant in a large pot, being fed 2 or 3 times a week in the past...there should be plenty for her to eat). I'd also foliar spray Mg and see if things don't improve in terms of your leaves' coloration. Good luck.

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You were right, After I posted the picture, more leaves started showing signs of Nutrient Burn on the tips of the leaves. It was the Dyna-Gro Foliage-Pro....

Looks Hungry to me. N.

It was definitely nutrient burn...
It definitely wasn't hungry....
This is 1 week of growth....