Indoor plants showing deficiency, outdoor ones do not?

[Vibesgirl]

I have 3 white lightning and 3 massive cracks autos in a tent, at 62 days. 2 weeks ago, when flowering really started plants in tent had brown splotchy/yellow leaves. Pretty sure I have a cal/mag and/or phosphorus deficiency since I stopped feeding GO Bloom when I saw yellow tipped leaves and thought nute burn.
/OF soil mix, Optic 6 COB LED, 75-82 degrees, humidity range 44-54, although it was higher during veg before adding a dehumidifier.
Any idea why 4 plants that are out on a deck, of the same strains, same wayer/food schedule except the natural rain, have no deficiencies showing? The buds are not as tight and thick, but also all leaves are healthy!

 

[BigNate89]

Do you water with tap water in the tent?

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[namvet25]

I have 3 white lightning and 3 massive cracks autos in a tent, at 62 days. 2 weeks ago, when flowering really started plants in tent had brown splotchy/yellow leaves. Pretty sure I have a cal/mag and/or phosphorus deficiency since I stopped feeding GO Bloom when I saw yellow tipped leaves and thought nute burn.
/OF soil mix, Optic 6 COB LED, 75-82 degrees, humidity range 44-54, although it was higher during veg before adding a dehumidifier.
Any idea why 4 plants that are out on a deck, of the same strains, same wayer/food schedule except the natural rain, have no deficiencies showing? The buds are not as tight and thick, but also all leaves are healthy!

Somtimes LED or COB lighting may cause leaf problems if they are to close to plants. picture would help.

 

[Vibesgirl]

Rainbarral water for the tent, and when additional is needed outside, ph 6.2-6.4, runoff tested 6.1 last night. Lights ate 24" from the tops. One other variable to note, I have a Chemdog Pakistani photo in veg in the tent, perfectly green leaves, no spots or yellow. Brings me back to the issue of first noticing this at flower time.

 

[BigNate89]

Most definitely looks like a calcium deficiency. Adding some cal-mag should help you a lot. As for the rainwater, is it tested? Average rain water pH is 5.5 but living near an area considered to be polluted can bring it down as low as 3 which is way too acidic. Hope this helps!

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[Vibesgirl]

Thank you, I am pretty sure you are correct. The rain barrel water is testing at 6.2-6.4 range everytime.
Still weird that the outdoor grow is not showing it. I've never heard of led's sapping nutrients, but it makes me wonder.

 

[BigNate89]

Thank you, I am pretty sure you are correct. The rain barrel water is testing at 6.2-6.4 range everytime.
Still weird that the outdoor grow is not showing it. I've never heard of led's sapping nutrients, but it makes me wonder.

I wouldn't think so. I grow with LED's and have never encountered this problem. I think calmag would clear it up. Example of herb grown with LED's, no problems at all

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[Arthur]

LED will cause the plant to use more calcium and magnesium... but also things to consider...temp humidity differences (think VPN)... light intensity and length... all cause plants to take up water and nutes differently.

I have 2 sour livers going 1 in 1 out...both about week 8...massive difference in nute uptake, and need for H2O.