Leaves turning yellowish

Hello, I’m new to growing and this is my first plat. It was in a pot outside in a greenhouse and since 1 week it is “in the soil”. I have added good amounts of compost to the soil and sometimes I give it NPK fertilizer. Two days ago I noticed the leaves are starting to turn more of a light green color (probably going to be yellow).
Im thinking of an iron deficiency.
I am not quite sure tho, thanks for any help/advise!

Shining Silver Haze, Fem (Royal Queen Seeds)
Outdoors (in a greenhouse)

It just looks hungry to me. What nutrients are you using?

Plagron terra bloom (basic nutrient)
I know its for bloom and not veg but thats the only one I could get at that time.

If you have more of your compost, make a tea. Add 1 cup of compost to 1 gallon of water, bubble overnight (preferred) or let sit overnight and stir to make sure the bottom sludge gets mixed up. Strain and water with the tea. You can top dress with 1T of used coffee grounds (not to much) for additonal N. The light green new growth you are seeing is nutrient deficiency, which in veg usually means N def. Otherwise your plant does not look stressed with other issues.

Thanks, I will definitely try it. But what do you mean with bubble? Is it like one of those things you put in a fish tank to get oxygen into the water?

Yes. I use a normal fish aquarium air pump to aerate the water. But I’ve also let it sit overnight with an occasional stir to ensure that all nutrients leech out. Both will work. If you have access to unsulfured molasses (not brown sugar) and earthworm castings, add that to the mix at 1T and 1 cup per gallon as well. If you have access to rabbit poo, grab it because that is black gold. You don’t have to compost it. Just use it fresh. It will not burn your plants.

Thanks again, I will post the progress in a few days.

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