I think I have nutrient deficiency... but am having trouble determining which one...

Hi everyone,

I am new here, but I have been observing the forums and this site seems like a nice community and everyone seems knowledgeable. I have searched all over the net using my google-fu and I can not determine for the life of me what's going wrong. I was growing in a seed sprouting box, ones that people use to get sapings and they for the most part grew fine, when I transplanted them I used 5.5-6.5 ph fertilizer with artificial nutrients composed of NPK 13.3-6.1-17.1. And they seemed to do fine. But now I am noticing that some of my plants are looking much greener than the other two. The leaves seems to be yellowing from the inside out. Any help would be greatly appreciated!

My set consists of a 400 watt HPS lamp with auto flower, feminzed, strains.

Attached below are two plants with problems and the last one is the one that I think is healthy.

[attachment=o285797][attachment=o285798][attachment=o285799]

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Originally Posted by 420delivery

i think it'll be ok

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Oh okay, I was kinda nervous as I had already lost my first batch and am kinda overly protective of this batch, alot rides on these plants surviving. I was thinking nitrogen deficiency, but in some photos online, it states that it could also be a phosphate deficiency. I gave it some more nutrients via watering earlier as I was awaiting a response. Thank you for your time and understanding!

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Originally Posted by greenspartan

Hi everyone,

I am new here, but I have been observing the forums and this site seems like a nice community and everyone seems knowledgeable. I have searched all over the net using my google-fu and I can not determine for the life of me what's going wrong. I was growing in a seed sprouting box, ones that people use to get sapings and they for the most part grew fine, when I transplanted them I used 5.5-6.5 ph fertilizer with artificial nutrients composed of NPK 13.3-6.1-17.1. And they seemed to do fine. But now I am noticing that some of my plants are looking much greener than the other two. The leaves seems to be yellowing from the inside out. Any help would be greatly appreciated!

My set consists of a 400 watt HPS lamp with auto flower, feminzed, strains.

Attached below are two plants with problems and the last one is the one that I think is healthy.

[attachment=o285797][attachment=o285798][attachment=o285799]

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Looks like ca/mg issue. Did you add any? What was the water supply? Also if the yellowing from inside the leave outward, gets very bad, that's a lack of iron.

also check the soil with a run through for ph, looks like there is a issue too.(I was looking the pics over again.)

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Originally Posted by Bloomin Idiot

Looks like ca/mg issue. Did you add any? What was the water supply? Also if the yellowing from inside the leave outward, gets very bad, that's a lack of iron.

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I am currently running between bottled water and tap water. My tap water is apparently very hard. I have not added ca or mg to it yet. I saw some photos of ca and mg deficiencies but they did not look like the issue I was having, but I couldn't be sure. Would a calcium-magnesium carbonate help?

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Originally Posted by Bloomin Idiot

also check the soil with a run through for ph, looks like there is a issue too.(I was looking the pics over again.)

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I checked the surface soil and it looks to be about 6 ish. I only have a solution ph tester, no digital gauge at the moment, kinda strapped for cash :-(

Just checked my soil run off and it's about 5.

I really appreciate your time and assistance Bloomin. This is my first grow and I tried my best to do as much research as possible prior to starting it.