LOW HUMIDITY = 15th hour "DROOP" IN VEG ?

[crasher]

Hi guys, first timer here experiencing a strange problem...

I'm almost at the end of vegging stage right now but for the past week or so my little green friends have been DROOPING only after 15 hours of a 400w HPS...

The set-up although amateur is of high standard as are my methods, room temp at the TOPS has always been fine 27-28C app. most of the time...

So I purchased a Hygrometer for Humidity readings and accurate Temp., best £11 I have ever spent as after callibration I immediateley saw my Humidity down to 30%...

Right away I put a 15ltr bucket of water in there BUT as yet do not know how else to get the level up ( I will be getting a Humidifier if that is the best option )

BUT WHAT CAN I DO TO RAISE HUMIDITY RIGHT NOW ??

Thanks for ANY help in advance !

 

[datura_kid]

i did fine veg with 30%

 

[crasher]

Yeah to be honest I wasn't that bothered about the humidity at first knowing that the chances of rot would be lower but it's this damn DROOP that they have...ALWAYS after 15 hours or so, not sure what else it could be ?? You see all of them are doing it, at seperate heights and ages, which to me is quite puzzling at this point...
I just don't want to have support problems in later flowering if I can't correct the problem.

 

[libby]

Not too wet or dry are you? can't see it being ANYTHING to do with your lighting,no matter what hours you choose.
Apart from drooping, are you plants right colour etc ?.

 

[crasher]

The light gap from tops to bulb is 50cm and seems fine, and the colours also are fine ( lovely actually ;-)

As for too wet or dry, the room seems more on the dry side under the light obviously, and average atmosphere in the outer room ( room in a room / tent style )

I don't think anything else has been overlooked...However I'm now wonderering if they have O2 problems

At the end of the 18hrs they droop, have NOT checked yet at which point they then pick back up, but they are ALWAYS fine just before switch on, so it's within the 6hrs off that they prefer 1 certain factor I am guessing...

 

[crasher]

I was also planning on putting in my new Sunmaster 600w Dualspectrum bulb in for the next switch on, would this be a bad thing to do with my current problem or hopefully not related ??

 

[FreezerBoy]

My RH routinely reads LO with no such trouble. LO being less than 20%. RH may be exacerbating your problem but, I doubt the problem is RH itself. Are you sure you're not under watered?

 

[crasher]

I have been giving the larger plants (55cm) app. 500ml-1ltr, the smaller ones (35cm) 300-500ml each time...Usually every other day, as the soil doesn't seem to be dry daily...

Am I underwatering then perhaps ? A friend says he does fine with this method...

We are talking about Jack by the way

 

[LasVegas420]

I've grown in 15-20% RH without problems. A bit harsh on the plants but they will grow.

I suspect over or under watering.......

 

[crasher]

I do now too, but over or under would be the question...

But on that matter, in 12ltr pots (10ltrs soil) the roots on the larger ladies have actually started to surface on the soil level, evenly all the way round, is this massive growth ? Or are they searching for more ?

 

[robotwithdreams]

If the root system is fully developed and you have decent medium with perlite, you should water the pot completely, no need to measure, make sure its well saturated, now let it dry out somewhat.


do they perk up by the time the sun comes up for them?

 

[Kcar]

You could use a ultrasonic fogger or a wet towel hung in front of a fan.

 

[highonmt]

I do now too, but over or under would be the question...

But on that matter, in 12ltr pots (10ltrs soil) the roots on the larger ladies have actually started to surface on the soil level, evenly all the way round, is this massive growth ? Or are they searching for more ?

The large air roots are normal and good. I used to water until about a cup of water ran out of the buckets. I grow in the high desert and my humidity has never risen above 35% my usual humidity is less than 10 % with the lights on and 20% at night. I never see this 15hr wilt.
Cheers,
HM

 

[crasher]

Thanks very much for the input guys...

Now by the sounds of it I'm UNDERWATERING, as I have never actually saturated the pots ! But honestly the growth and vigour seemed / seems to be going great so didn't feel the need for more...

Just before writing this I have given them all plenty of water with feed and left the room with fingers crossed, I was wondering though...

When is the best time, in your experience, to water...Lights on, mid-way, or lights off time ??

Thank you

 

[deepforest]

i had same "problem". i figured they just are getting ready for night and have had enough sun. it happened to me with Haze genetics. is it really a "problem"? or does it just look like one. ps i had high humidity. so dont fret i say.

 

[crasher]

i had same "problem". i figured they just are getting ready for night and have had enough sun. it happened to me with Haze genetics. is it really a "problem"? or does it just look like one. ps i had high humidity. so dont fret i say.

Well, yes it definately looks like a problem no doubt, and although amateur the same thought entered my mind about enough light...
I started thinking about others on permanent 24's and this just didn't seem right.

Anyway, I now have a 600w bulb in, so if the light WAS too much after 15hrs on a 400w, by rights they should now ( if light is the problem ) be UNHAPPY earlier than 15hrs now maybe / possibly / surely ??

I have also recorded a temp. drop overnight of 11F, which I believe is acceptable so still a bit baffled but am getting there, am gonna stick it out... and still loving my new hobby, don't know why I never started 10 yrs ago ;-)

 

[Grateful D]

it happens to me to. i am growing nyc diesel and white widow and it only happens with the diesel. i also have low humidty. even with 2 humidefyers running on high 24/7 i can only get the room to 35% with the ventalation on. i have one cold air and one warm air humidifyer. my room is only 3.5x3.5x5.8 my disel starts to droop about an hour before the lights go out regardless of watering

 

[Pompey_Monkey]

Thanks very much for the input guys...

Now by the sounds of it I'm UNDERWATERING, as I have never actually saturated the pots ! But honestly the growth and vigour seemed / seems to be going great so didn't feel the need for more...

Just before writing this I have given them all plenty of water with feed and left the room with fingers crossed, I was wondering though...

When is the best time, in your experience, to water...Lights on, mid-way, or lights off time ??

Thank you

Crasher,

If you think you may be underwatering, try to water a sample of your plants a bit more - That way you'll be able to tell the difference.

Also, don't forget that drooping can also be caused by OVER watering, although it doesen't sound like it in your case.

I run 24hrs and have never checked my RH. Never had any problems though. I think that unless the RH is extreme at one end or the other of the scale, it rarely seems to be the most significant factor in the growth of my plants.

 

[crasher]

Hmm ok, so obviously not alone then...

I watered before lights out and gave them extra (double actually) on 50% feed...
Pretty much the same as the first occurance, fine again at lights on time...

As I write this I'm expanding the growspace by 50% to create a more open home for them, though they were not bunched up at all to begin with, just to have more area really and a bit more air volume in there.

 

[crasher]

Yeah thanks P M I was going to try just 1 first on a different plan, but they've gone great up until now and I'm so close to flowering am not sure if the problem will persist if left unchecked.