Help! Nutrient deficiency? yellow leaves!

[4x4Turbo]

I'm thinking nutrient problem. They seem to go 3+ days without needing water and my humidity is normally 30-40deg maxing at 45 during the night. I switched to bloom nutrients from Technaflora and i've read that yellow leaves can likely be a nitrogen deficiency. I need help from the pro's, I'm just a newb!



H=N
C=N
S=Y
L=N
R=N
T=N
D=N
E= N

E-Indoor
E-soil

CSL-Miracle grow Seedling mix

SCL-Anything you have added to the soil Nothing
SCLR-Soil or slab runoff pH Don't know
E-Water source Tap
E-Source water pH 6.8-7.0
HRT-Source water EC (if hydro)
E-Age of plant 2wks into flower/6wks old
E-Type of fertilizer Technaflora starter kit
E-Rate of application Every other watering (if hydro, this is your PPM number, preferably after each component is added)
E-Lighting source and distance from plant Was at 12in now at 17in
E-Air temperature (both day and night if you are running a dark period) 75 at night 78-80 during the day
HD-Reservoir temperature
E-Air % Relative humidity 30-40%
E-Lighting schedule 12/12
E-Type of ventilation your room has Air cooled hood is recirculating back in the room. grow room door stays open most of the day.
TR-Did you pre-soak your media in pH corrected solution? No

4x4Turbo Reviewed by 4x4Turbo on 10-31-2008. Help! Nutrient deficiency? yellow leaves! I'm thinking nutrient problem. They seem to go 3+ days without needing water and my humidity is normally 30-40deg maxing at 45 during the night. I switched to bloom nutrients from Technaflora and i've read that yellow leaves can likely be a nitrogen deficiency. I need help from the pro's, I'm just a newb! H=N C=N S=Y L=N R=N T=N Rating: 5

[stinkyattic]

Slight tip burn along with N def looks like lockout from fert buildup in soil and/or overwatering.
Your exhaust should be brinigng fresh, not recirculated, air into the room- if I mis-read, cool; if not, rearrange the ducting to allow a constant supply of fresh, cool air.
How lo9ng have the plants been in those pots?
Do the pots have a built in drain cup? If yes, remove it and smell around for evidence of rot- those things make drainage TERRIBLE in any pot and cannabis hates poorly draining soil.

[4x4Turbo]

Slight tip burn along with N def looks like lockout from fert buildup in soil and/or overwatering.
Your exhaust should be brinigng fresh, not recirculated, air into the room- if I mis-read, cool; if not, rearrange the ducting to allow a constant supply of fresh, cool air.
How lo9ng have the plants been in those pots?
Do the pots have a built in drain cup? If yes, remove it and smell around for evidence of rot- those things make drainage TERRIBLE in any pot and cannabis hates poorly draining soil.

You didn't mis-read the exhaust/intake, as there is none. lol. Thanks a lot for taking the time to help me

I just talked to a guy about buying his 8in can fan with 8in ducting and ph/ec/ppm pen. He also had a 40in filter he wants $200 for lol. Think i'll be making my own.

I can't figure out how to get fresh air in there, the outside air is way too cold for an intake source so i'm left with two options. intake fresh air from the house to the room through the door by laying ducting outside the grow room and having the 8in can fan blow into the room. Or, cut a hole in the wall, and have the can fan exhaust into the next room allowing fresh air to passively come in through the open door. I'd rather do option number 2 as i can put a charcoal filter into the next room connected to the fan pushing air through it.

The plants have been in the pots for 3wks and the pots are 2.3gallons I'm about to put them in 5gal buckets. Theres no draining dish. I know better than that

[4x4Turbo]

Made the fan pull fresh air in from the house to the room, it's only a 6in inline home depot fan but it is pushing some air in there. I really want to buy this co2 emitter and seal the room, using the 8in can fan to push air through the hot hood and through a charcoal filter recirculated back in the room. Do you think this will work? Also the guy i'm buying all of this off of told me to use his drip system(instead of flood and drain) and use rockwool instead of planting right in the hydroton, as the rockwool will work as a ph buffer in case i mess up the ph. lol Does that sound right? I don't know how i'd make the rockwool fit into my dwc bubbler/cloner. I apologize in advance for making things too complicated.

[stinkyattic]

Rockwool is not only NOT a pH buffer, it actually screws up your pH if you don't pre-soak it.
Fans of that type are more efficient when they PULL air, not PUSH it. Set your EXHAUST to PULL air from HIGH in the room. LEave the intake passive and unobstructed.

I take it the dirt plants you show are being hand watered and when you go hydro, you will start with clones?

[4x4Turbo]

Thanks, and yes I plan on going hydro with the two clones i cut, the tiny one i tried putting in a humidity dome with bad results so i made the bubble cloner and took one more cutting. They don't seem to be making any progress but its only been a few days.

Is there any reason i can't seal the room, use a co2 emitter and use that duct fan on a scrubber in the room? with enough air circulation from two box fans and the co2 running I don't see why it wouldn't work for me. I'd rather not buy the can fan and cut a hole in the wall, but if thats what it takes, than thats what i'll do.