need help!!! can't seem to figure out problem!

How long has this problem been going on?
*it starts when it switches to flower stage.

What system are you running? (DWC? Ebb flow? Aero? Water Farm? Flood Tables? and so on...)
*top feed by hand

What STRAIN are you growing?
*not really sure, i think it is a sour diesel

What was the establishing technique? (Were the seed or clone?)
*clones

What is the age of your plants?
*about 3 weeks of veg

How long have they been in there mixture they are in now?(coco,soiless etc..)
*grodan, clones were put in the baby grodans than 3 weeks in the 6 x 6 grodans

How tall are the plants?
*30"

What substrate/medium are you using?(Hydroton, RockWool etc.)
*rockwool

What is the Water temperature?
*around 65-70

What color are your roots? White? Brown? Are your roots slimy?
*white and no they are not slimy at all

What Nutrient's are you using?(If growing soiless)
*mainly advanced nutrients

How much of each nutrient are you using with how much water? *Knowing the brand is very helpful*
*i have used this program at other places and it has worked great, but for some reason this room seems to have it out for me. so i really don't think it has anything to do with what i am using.

How often are you feeding? (If using soiless)
*once per day, right when lights come on

How often are you giving nutrients? (If using soiless)
*once per day, when lights come on

If flowering, when did you switch over to using Bloom nutrients?
*in the pics, that is in week 5 of bloom, but this effect starts happening right when it goes to bloom. it just gets worst as time goes. veg is very strong.

What is the TDS/EC/PPM you are using?
*between 1100-1400 depending on the week

What is the pH of the "Tank"?
*between 5.6 to 5.8

Are you sure your calibration is correct on your equiptment?
*positive

When was your last watering?
*this morning

What is your water temps?
*65-70

How often do you clean your system: example: Flush out water replace with clean water and nutrients?
*once every 6 days

What size bulb are you using?
*1000w hps

What is the distance to the canopy?
*30"

What is your RH Factor(Relative Humidity)?
*was 65% but i am now trying 45%

What is the Day/Night Temp? (Include flucutaion range)
*day-73 to 78 and night-68 to 72

Tell us about your ventilation, intake exhaust and when its running and not running ?
*constantly running

Is the fan blowing directly at plants?
*no

Is your water HARD or SOFT?
*hard

What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water?
*tap and measured 250ppm

Are you using water from a water softener?
*no

Has plant been recently pruned, cloned off of or pinched
*no

Have any pest chemicals been used? If so, What and When?
*no

Are plant's infected with pest's
*no

Hers' a chart which if you follow it AS CLOSELY as possible, you should have a solution... some of the symptoms are similar so you will have to look at ALL of the symptoms... hope I help

My plant does the same when the humidity is low or the light is too close... in other words its hot and dry. Raise the light another foot and let the humidity rise, if they improve you will know that was it.... just don't let it get too hot....

This is the 4th run, and the same thing keeps happening. My humidity is set to 65, so I thought maybe that is to high and as for the temps it does noy go over 80 degrees

Your plants are burned from light being too close and they are burned from way too high of a nturient solution. What setup are you running to feed your plants everyday? You not only burning them with the light being too close and too high of nutes, but you have lockout of other nutrients......

Your top 3 pictures show a Potassium deficiency, your bottom two pictures show nutrient burn. An RH of 65 is high, but wouldn't cause the problems shown, you might want to get that under 50 to stop possible mould though.

Your tap water TDS is highish and 1100-1400 feed every day is high.

Put that lot together and you get a high salinity build up in your substrate locking out Potassium. You're going to have to flush those built up salts and lower the TDS of your nutrient feed, I'd back it off to 700-900 and see how you get on.

I'm not a hydro grower though, so you might want to ge more specific advice from someone who is and is more familiar with your nutrients and setup.

MynameStitch said:

Your plants are burned from light being too close and they are burned from way too high of a nturient solution. What setup are you running to feed your plants everyday? You not only burning them with the light being too close and too high of nutes, but you have lockout of other nutrients......

Click to expand...

the lights on this run are currently 32" away. at the other place i use to do this at i had the lights 20" away with no problem. same goes for the nute program, i have been using this technique for years on the same strain. but for some reason at my new house, i keep getting this problem. nothing has changed.
actually i am lying, one thing has changed and that is spraying the kids when they are in veg with the same nutrient water as what i am feeding. could that be the problem. the ppm for the spray is between 900-1000. but they are so healthy in veg. it is when they go to bloom is when all this shit is happening. maybe one of those "it takes time to effect" things.
what do you guys think?

When shit goes down hill in the grow room - I go back to was was working.



If you moved - water could be different - that can change everything - the same ph and tds reading can be vastly different.

Looks like heat stress - and light burn to me.

80 usually means the leaves were seeing a bit higher temps.


One short period of overexposure can pretty well cook the sun leaves on the plant.

So you are sure nothing else has changed? Just the spraying of the plants... same reservoir, same size rockwool, nothing that could be toxic... what ever it is, it happened a while ago. Could it be the rockwool is drying out between waterings?

VenturaHwy said:

So you are sure nothing else has changed? Just the spraying of the plants... same reservoir, same size rockwool, nothing that could be toxic... what ever it is, it happened a while ago. Could it be the rockwool is drying out between waterings?

Click to expand...

positive nothing else has change but location. but i measure the water and it has the same ppm as my other place. unless something can't be measure with a tds. but yea same res, rockwool size and all. no the rockwool is definitely not drying out for sure. but this problem keeps happening. just out of curiosity if anybody knows, if 2 different tap waters measure at 250ppm, could it still be possible that one of the tap waters has to much of something that is making it toxic?

"*it starts when it switches to flower stage."
So they are in perfect health before flower? If it was the tap water it would happen in veg... What is your run off ec and how much run off is there?

I would use the grow formula for flowering until I was sure it wasn't the fertilizer...
I just looked at one of your pictures and the lower buds seem to be unaffected, is this correct?
http://www.icmag.com/gallery/data/500/37328plt3.jpg

Also never put anything on the leaves unless it is necessary...
This is a hard one... is there any vinyl anywhere in the room? It can make plants sensitive, as though they are getting too much light... vinyl can give off gases...

figure this out yet?

oops! for got about this!

but to answer the questions:
actually the bottom ones are affected as well.
and no i havent figured it out but i just got a ro water system. so we shall see if it works.