curling leaves!!

im having a problem with some crazy curling of some leaves. only at the tops of the plants. middle an bottoms are looking great. let me first say i had them under a 130 CFL from seed and theyre just over 12" tall now. 4 days ago i put them in our space which has a 600w HPS in an aircooled shade. temp is awesome, however the humidity is really low for veg. its sittin at 30%. i know, thats really low. im wondering if this could be my problem?? the top leaves are curling downwards really bad. the tips are almost further than the stem ends. but like i said, only the top ones are doing this. they are a little bit N deficient as they are goin fairly light green, but im still gettin used to my new BMO bat guanos. anyone got any ideas as to what my prob could be?? maybe they just need to aclimate to the new area with the much more intese light?? also id like to add that they are almost a foot from the light and temps are perfect so its not heat doing this.

thanks in advance Rollitup!

Roseman said:

Marijuana Plants Problems - Yellow Leaves, brown spots, nutrient shortage etc.

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ive looked over that and i cant seem to find the "curling" that they are exhibiting. like i said they are a little bit lacking the N but nothing major or to be worried about. i am really stumped. also i dont have a camera so i cant take any pics, cuz i know pics would really help

Hey bro go to faqs atb the top of the site and go to #7 and then go to nutrient/ph deficiencies and then look at the leaves curling down category and that should help Good Luck.

thanks haze...but still not the same symptoms."In addition to appearing to look like iron deficiency,"" the tips of the leaves curl and the edges burn and die.""

its not just the tips its the whole leaf.. man i wish i had pics...im really startin to think its a humitdity problem cuz they were perfect under the CFL...

Curling is always heat related. Try a foilage spray or misitng with plain water. Get the humidity up. Get a FAN too.

Roseman said:

Curling is always heat related.

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i dont know about that.

the room is 21-22c solid and drops no more that 1-2 deg at nite usually only 1. gotta love the memory therm/hygrometers

First off, since "clawing" is such a common problem, I addressed it many years ago by drafting this ditty: https://www.rollitup.org/marijuana-plant-problems/150004-plant-moisture-stress-symptoms-solutions.html It has your answers. Having said that, mi dos centavos ~

mclovin4:20 said:

let me first say i had them under a 130 CFL from seed and theyre just over 12" tall now. 4 days ago i put them in our space which has a 600w HPS in an aircooled shade.

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Too much light. You went from about 800 f.c. (if lucky) to about 9,000 f.c., move that HPS about 18" off the tops. Less is more now. The plant is not acclimated to such light levels and is showing its stress via the curling leaf margins and yellowing.

temp is awesome,

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Doesn't matter, again, see my link.

however the humidity is really low for veg. its sittin at 30%. i know, thats really low.

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It's not low if the root system is adequate and can handle the high transpiration rates. Doesn't hurt to mist a couple of times a day though.

im wondering if this could be my problem?? the top leaves are curling downwards really bad. the tips are almost further than the stem ends. but like i said, only the top ones are doing this. they are a little bit N deficient as they are goin fairly light green,

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That's because your high light has bleached out the chlorophyll. Not good. Chlorophyll, or the pigment that gives a plant its green color is the lifeblood of the plant. Lose it and you lose carbo production via photosynthesis. Simple botany bro. I would increase the N. Adding more say.....10-10-10 does not increase N in relationship to the other NPK elements. You need to scratch in some blood meal into the top 1" of soil or add something like a 30-10-10 now.

Now perhaps you guys can help me. I just tried to add a sig link and have forgotten the proper syntax. Having a senior moment ya know. Any help would be appreciated so I can go back and do mah thang.

Good luck,
UB

are your plants root bound?

whenever you see the top of a plant doing poorly, 90% of the time there's a problem with your roots. another problem might be the level of soil around the stem. make sure you see a root flare. if it is buried your plant will not be able to get the oxygen it needs.

another good indicator of these problems is epicormic sprouting from the base of the plant. (new leafs sprouting down low)

I have had curling under leaves, back then it was heat and nuts.

How is your watering schedule. Could you be over watering? Are the leaves limp or just curling. How is the colouring on them? Can you post pics.

wow uncle ben you are the man!! definately puttin me on the right track. i knew that thew light was gonna take some acclimation so i put the light a foot away. i guess i need to do more. gonna go 20" for a week and see where that puts me. as for the root system, its absolutely INSANE! its the first time ive added mycorizae fungi(however the heck you spell it) and the results are nuts. they roots are pretty bound up right now (transplant is gonna be next week). but i make sure they dont dry out . i usually only water twice a week one food and one just Super Plant Tonic. so your sayin that now ive gotta up the N quite a bit?? ive got my weekly tea brewing right now which comes out to about 10-4-3 with worm castings for trace elements. what else would you recomend adding to up just the N?? you were sayin blood meal, would that be good for tea or just top feed on the soil??

and as for the helpin you with the sig stuff, im not that great with comps, really wish i could help you out. maybe someone else can help this guy out??

mclovin4:20 said:

wow uncle ben you are the man!! definately puttin me on the right track. i knew that thew light was gonna take some acclimation so i put the light a foot away. i guess i need to do more. gonna go 20" for a week and see where that puts me. as for the root system, its absolutely INSANE! its the first time ive added mycorizae fungi(however the heck you spell it) and the results are nuts. they roots are pretty bound up right now (transplant is gonna be next week).

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When you upcan, you can greatly increase your rootmass by scoring the rootball with a sharp knife or razor blade. Tip the plant over on a counter and cut about 1/2" into the ball moving from top to bottom, four scores around the ball. Make sure you cut thru the spin-out at the bottom. This will induce secondary root branching behind the cuts and give you more plant vigor.

but i make sure they dont dry out .

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Good. Contrary to popular belief, you should never allow the plant to go dry. IOW, no wet/dry cycles.

i usually only water twice a week one food and one just Super Plant Tonic. so your sayin that now ive gotta up the N quite a bit?? ive got my weekly tea brewing right now which comes out to about 10-4-3 with worm castings for trace elements. what else would you recomend adding to up just the N?? you were sayin blood meal, would that be good for tea or just top feed on the soil??

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Your 10-4-3 would be excellent for greening up the foliage and support more foliage production. I don't do teas cause I'm too lazy, I just add the stuff to the soil and when I water it makes its own tea. I like blood meal as a slow release source of N. No tea, scratch the granules into the soil so that the soil microbes can convert it into a ammonical form and then finally nitrates. Plants do alot better with a constant source of nutes than a big one now and then.

and as for the helpin you with the sig stuff, im not that great with comps, really wish i could help you out. maybe someone else can help this guy out??

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I got it, thanks anyway.

Good luck,
UB