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E-indoor or outdoor - indoor
E-soil, soilless, coco, aero, or hydroponic -soilless
E-specific medium
CSL-Soil type/brand - promix bx
HCL-Hydro/aero/soilless system type -3 gal pot ?
SCL-Anything you have added to the soil - no
SCLR-Soil or slab runoff pH
E-Water source - tap
E-Source water pH - 7.1 from the tap adjusted to 6.4
HRT-Source water EC (if hydro)
E-Age of plant - 22 days into flower
E-Type of fertilizer - advanced nutes which r new to me
E-Rate of application (if hydro, this is your PPM number, preferably after each component is added) every other watering
E-Lighting source and distance from plant - 1000 watt air cooled -2 ft
E-Air temperature (both day and night if you are running a dark period) -75-80 daytime- 65-70 nighttime
HD-Reservoir temperature
E-Air % Relative humidity - 50-60%
E-Lighting schedule - 12/12
E-Type of ventilation your room has - reciculating in room odorvent 20 w/vortex 8"
TR-Did you pre-soak your media in pH corrected solution? -? please explain

hey all - my problem started about a week and half ago. i saw little brown spots on my largest leaves. then all went to shit they started to yellow and the spots got bigger and eventually turned black with the leaves shriveling up. now the spots r going to the next size leaves.
i dont have a clue. i had used epsom salts almost every watering before this came up. maybe that has something to do with it. maybe i over ferted no clue. please help
i check this site everyday any info u need from me i will provide but i need to get this problem corrected asap. thanks
i have recent pics i took tonight hope they can shed some light.

You don't actually have ventilation in your room. Add an exhaust.
Looks like calcium deficiency. How long have they been in those pots, and why are you adjusting your tap water so low? Cannabis grows just fine in ProMix at 6.7, and the pH of that mix drops over time anyway when the caco3 (lime) is used up. Ca def points to that as well.

Quote:

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Originally Posted by stinkyattic

You don't actually have ventilation in your room. Add an exhaust.
Looks like calcium deficiency. How long have they been in those pots, and why are you adjusting your tap water so low? Cannabis grows just fine in ProMix at 6.7, and the pH of that mix drops over time anyway when the caco3 (lime) is used up. Ca def points to that as well.

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Hey Stinky, Is this another problem Cal-Mag+ could help solve? :D

I personally hsve successfully treated that promix pH drop problem with a combination of calmag to slow the drop and frequent repotting to pre-empt it. Works for me. Individual results may vary ; )

Well he's also in 3 gallon pots and those look like some BIG plants there. I'd definitely check ph runoff....but i wonder about rootbound contributing to the issue of low ph as the roots get squeezed off and die in the bottom of the pot......further contributing to ph issues.

thanks. would venting through the chimney be ok? i worry about my temps dropping. they have been in those pots since flowering 22 days. i will raise the ph up to 6.7. how would u suggest that i fix the calcium problem? i have a couple days until i can water them should i take the damaged leaves off?