I'm stumped

[Dezarias]

Greetings all,
Iâ??m humbly asking for some help on what may be going on in my room. This is a mother/clone only room and Iâ??m having some issues with the fan leaves on the bottom of the plant going yellow, necrotic spotting, and withering. Iâ??ve been doing a little bit of supercropping and LST but all of that looks fine.

Two of the pictures are pictures of lower fan leaves and the other two are from the top of the crop which looks much better.
Attachment 276904Attachment 276905Attachment 276906Attachment 276907
Any help is appreciated!

What is your experience level? I would say novice

Your Equipment:
.1) Type and wattage of lights. Itâ??s a T5 4 foot 4 bulb fluorescent system
.2) Distance from tops? 3 to 4 inches
.3) Reflector type? Typical grow light reflector with ballast included for flourâ??s
.4) Is there a consistent fresh air supply? Yes
.5) Do you have an exhaust fan and a circulation fan? Yes
.6) What are the bulb wattages, kelvin ratings, and schedule? 54watts each, on 24 hours

Your medium:
.7) Specific brand and type of soil, (coco, peat based soilless...) Fox Farms Ocean forest mix with mycorrhizal additive
.8) Size of container. 3 gallon containers
.9) Did you use peat pucks (or similar) to root clones or germinate seedlings? Rapid rooterâ??s

Your nutrients and water:
10) Source of water? (tap, bottled or filtered) What's it's ph before adjusting? Tap water thatâ??s been reverse osmosis filtered. PH before adjusting is 6.0
11) Method of checking water ph. (ph pen, test strips, aquarium test kit...) Strips
12) Method of adjusting water ph. (phosphoric acid, white vinegar, hydrated lime, PH Up...) Lemon juice and baking soda
13) Specific brand and N-P-K ratio for each bottle. List dosages (quantity per gallon) and current feeding schedule. GH Flora Nova â?? 7-4-10 one part grow. Nutes every 3rd or 4th watering
14) How often are you watering between feedings, and how much per watering? 2 to 3 times between, at least 2 liters to a gallon each watering, get about 10% runoff
15) Any additives or tea's? (Superthrive, CalMag, molasses, Mother's Earth...) No
16) Are your ph levels stable, or do they fluctuate? Pretty stable
17) What is your ingoing water's ph? ...your runoff ph? 7.0 and runoff at 6.6
18) Do you foliar feed? If so, with what, how often, and at what time do you spray? No

Your growroom:
19) Indoors or outdoors? Indoors
20) What size of closet, room or hut? 8X10 room
21) What are the temps and humidity levels while lights are on? ...With lights off? Stays 75 to 80 degrees. Humidity levels are only at roughly 30% though,
22) Have you seen signs of insects in the growroom? No insects

Your strain:
23) What strain are you growing? (Indica dominate or Sativa dom?) Kalashnikova, Exodus Cheese, and White Widow
24) From seeds or clones? Seeds
25) Is this an autoflower strain? No

Dezarias Reviewed by Dezarias on 07-05-2011. I'm stumped Greetings all, Iâ??m humbly asking for some help on what may be going on in my room. This is a mother/clone only room and Iâ??m having some issues with the fan leaves on the bottom of the plant going yellow, necrotic spotting, and withering. Iâ??ve been doing a little bit of supercropping and LST but all of that looks fine. Two of the pictures are pictures of lower fan leaves and the other two are from the top of the crop which looks much better. 276904276905276906276907 Any help is Rating: 5

[Purple Daddy]

It's normal for lower sun leaves to die off as the plants begin to mature, I used to stress over this as well but there isn't really anything you can do about it. The tops look fine so I think you're OK. Have you checked for mites? They will cause yellowing and necrosis as well.

[rattlingdags]

On the whole your girls are looking great There's a just couple of things that perhaps you may want to consider if appropriate.

Your using RO water, are you adding in extra calcium and magnesium to compensate? If not then maybe CalMag or molasses is worth trying.
Are they getting a good wet - dry cycle between waterings? It could just be me but those fallen leaves may be showing a touch of over watering.
If your using test strips for reading PH then you may not be getting an accurate colour to read from the runoff water. The runoff water can be tinted by the soil. A PH pen is a wonderful investment and does'nt have to be expensive.
Using baking soda and lemon juice for adjusting ph for long term tends to have mixed reviews from growers.
Those very top leaves on a couple of those tops in that last picture look quite thin and slightly curled under and in my (allbeit short) experience that, and the lower leaves, tells of off ph and/or over watering.
Just food for thought. All the best with them, I'm sure they'll be great

[Dezarias]

@Purple Daddy - I've had issues with spider mites in the past and I don't see anything like that yet.
@Rattlingdags - Some great info there, and a couple of things I think i'll change right away

Thanks guys!