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LC's w/ Dry Ferts, early fade w/ brown spots

Strain of Mj? Space Queen
Hydroponic or soil? Soil
From seed or clone? Clones
Age of plant in question? Day 41
What stage (Veg/Flower; how many days into)? Flower (41)
Medium (Soil, Rockwool, Hydroton etc.)? LC's mix w/ dry ferts
Container/Pot size? 2 Gal Smartpots
Have they been transplanted, if so how long ago? Yes, ~2 weeks before flower
If soil, composition ratios (peat moss, perilite, vermiculite etc.)? LC's mix
Water runoff Ph? No idea, I don't do ph
Nutrients added? Compost tea / molasses / Liquid Karma
Ratios of nutrients (N% P% K%)? - N/A
Feeding schedule? - only occasional feedings, water with plain water 90% of the time
When were they last fed/watered? constant via blumat
How are you determining when to feed/water (weight, wilting, etc.)? N/A
TDS/EC/PPM? N/A
Tap/RO/Distilled water? Tap (bubbled 48hrs before added to res)
Ph before and after adding nutrients? N/A
Is your Ph equipment properly calibrated?N/A
Light intensity/Age of bulb/Wattage? 600w HPS
Distance to the canopy? ~20in
Temps at canopy? 70-75f
Temps at root zone or reservoir? ~70f
Day/Night temps (Min.-Max.)? Stable temps, negligible temp diff between day and night
Current air flow (CFM)? Sealed, 400cfm recirculating
Is there air blowing directly onto plant? gentle
Using CO2? No
Relative humidity? 45-55%
Growing technique (Scrog, Sog, Supercropping etc.)? LST / Supercrop
Has plant recently been pruned, clones taken, fimmed or pinched? No
Pests? None

Here is a curious one.

6 plants total, same batch of soil mix for all 6. 4 are in 2 gal SmartPots and all four show the same symptoms. 2 are in 6in square pots and they look right as rain.

Problem plants faded too soon, and some of the affected fans developed these brown spots.

Some items of note, don't know if they relate at all....

* Smartpots are re-used.
* Problem plants are directly under light, healthy plants are at the garden edge


Problem plants on the left, healthy on the right (not the clearest picture, but hopefully you can see the difference in color between the affected and the healthy)

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Brown spots

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vs a healthy specimen in a smaller container at the same age (the two in the smaller containers were actually the two runt clones of the batch to start with)

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