Brown spots, potential MG deficiency.... Your thoughts are requested!!

Interesting situation, New York City Diesel in three gallon container used for propogation purposes. Cuttings were taken from this mother plant one week ago at which time she started to develop these odd brown marks on her fan leaves. The brown marks only appear on the established fan leaves and not on new growth. The clones taken from this mother have shown no signs of browning. Each of these fan leaves also curls. Current room statistics are 85 F, 26% H (it's winter no way to raise it, yes I do have a humidfier). Plenty of CFM room changes airflow over three times every minute. This plant is three feet away from the CO2 generator and the spots do remind me of a problem I saw when someone put a plant next to an ion generator but since they two are unrelated I don't think theres a connection. After research I believe that since the plants are 3 ft tall in a 3 gallon container that it could be a MG deficiency, I have treated with cal mag for the last two days and have not seen any additional problems from the new growth, however, it's only when the fan leaves become established that the problem presents itself....... any thoughts grow masters of the world?

I can't even tell what medium you are in.......are you checking the ph of your solution or soil runoff. How about some more info about your specs?

3 gallon container....with no other specs I'll guess rootbound.....

The photos look like a k def.....I'll still guess rootbound and perhaps a few too many ferts.

Current medium is soil based, this isn't my medium of expertise since I a hydro person myself. I believe that yes the plant is potentiall rootbound; however, I have never before seen a rootbound plant act in this fashion. I have given thought to a potential K deficiency and have added Calmag to my nutrient administration since it contains both K and MG. I'm very much in doubt of overferting since I've been growing in a Miracle grow medium for the last two months and have added nothing but straight 6.5 ph water with no nutrients up until two days ago when I added cal-mag to the water treatment. My PH soild run off is approximately 6.3 which I believe should be ok, if not pls comment.
I just find it odd that these spots only presented themselves two days after taking 100 plus cuttings from this plant (I really butchered it but left the main to sex it). and moved it over by the CO2 generator (using CD6), i could be wrong but it just seems that there must be some connection to this event since for two months before the NYC Diesel looked incredible through veg state, best plant i've seen in 5 years in veg state. The plant is still very healthy on newer growth. Due to height restrictions we are only 3 feet from top of plant to a 1000 hps on a light mover so it doesn't get too hot, but I will admit that it is close, not too much I can do about it unfortunately. I'm with you on thinking K or MG deficeicny thought.... any thoughts?

Well the curled edges of your leaves are saying that either the plant is too hot....or is overferted. I'd also think overfert due to the darkness of the leaf in your photo unless that's your lighting and it doesn't appear to be.

CalMag has nitrogen in it....that would explain the darker green of your leaf....and too much could also explain locking out other nutes but so would being rootbound....I'd transplant to a larger container, drop the CalMAg unless you are using RO water and ease up on the stress.

I'm a hydro person as well.....and just the look of your plant too me says lockout vs true deficiency but I'm guessing....just based on the one photo of one leaf. I'd bet money you don't need MORE ferts....somehow you either need less or the plant needs more room.

I've read that very low humidity can also contribute to a k def and yours IS very low. Would bowls of water sitting around help at all? I still think you are looking at some sort of lockout however......

Good luck. :)

I will transplant over to a five gallon pot to hopefully relieve some of the problems we've discussed so far. I do have left over miracle grow soild which has nut's already in it so that should in effect eliminate any nutrients that the plant will need through the flowering cycle. The humidity in itself is a whole different issue, I've attempted using a large capacity humidifier and bowls of how steamy water to increase ambient humidity. However, I am unable to do so. Currently my chamber for growing is very limited and I'm running two 1000 hps lamps, normally my hydro setup contains three 30 gallon resivoirs which when hot give off enough humidity to keep it around 50% in winter, but since all of them are down currently I'm stuck with what I have. In addition the totaly square footage of the room is only 128 sq ft and due to the heat buildup the room runs an amazing 2000 cfm output from the room using two large cyclone fans with the same 2000 cfm input into the room using a number of hydrofarm fans. I've tried putting water into the room unfortunately as soon as humidity comes off of the water it is quickly evaculated from the room. With those limiting factors such as room height, cfm, lights etc. I've had to come up with some inventive solutions to keep the enviornment up to snuff. I will attempt to repot them into five gallon containers and keep my fingers crossed.

If you really cut a mother a lot, she'll sometimes get pissy on you. If the new growth is looking good, I wouldn't worry too much about the old.

Am I understanding correctly that you took 100 cuttings from an unsexed plant? You sure are one optimistic mofo. :thumbsup:

PC :smokin:

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Originally Posted by twilight12

I will transplant over to a five gallon pot to hopefully relieve some of the problems we've discussed so far. I do have left over miracle grow soild which has nut's already in it so that should in effect eliminate any nutrients that the plant will need through the flowering cycle. The humidity in itself is a whole different issue, I've attempted using a large capacity humidifier and bowls of how steamy water to increase ambient humidity. However, I am unable to do so. Currently my chamber for growing is very limited and I'm running two 1000 hps lamps, normally my hydro setup contains three 30 gallon resivoirs which when hot give off enough humidity to keep it around 50% in winter, but since all of them are down currently I'm stuck with what I have. In addition the totaly square footage of the room is only 128 sq ft and due to the heat buildup the room runs an amazing 2000 cfm output from the room using two large cyclone fans with the same 2000 cfm input into the room using a number of hydrofarm fans. I've tried putting water into the room unfortunately as soon as humidity comes off of the water it is quickly evaculated from the room. With those limiting factors such as room height, cfm, lights etc. I've had to come up with some inventive solutions to keep the enviornment up to snuff. I will attempt to repot them into five gallon containers and keep my fingers crossed.

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Intake and exhaust air cooled light fixtures outside your grow room, with its own separate system. This will make it much easier to control the environment within your grow room. It sounds like you have enough fans, you just need to set them up differently.

PC :smokin:

I don't know anything about pissy mother syndrome....so that one's on PC. What ARE the temps in your room? Hot enough to stress?