Please Help ID My Problem

[wacked]

G'day, I have a little problem with my grow, theres a lot of white spots appearing on some of my older leaves and also there are some holes appearing inbetween the leaf vains, I think it has a lot to do with my PH , Im using canna 3ml per ltr A+B coco with rain water which is leaving my PH at about 5, Im switching to tap water today and will see if this has any affect.
For some reason my pic's would'nt load up with the post so "chechout my gallery for pic's"

Cheers Wacked

 

[HuffAndPuff]

It is kind of tough to tell from the color of the photos...

My first thought was that it kind of looks like light burn. What are you growing these under, and how old are they? Again, it is tough to tell based on the color scale, but those pale spots do resemble light burn. The holes between the veins would also indicate that this is a possibility. What keeps me from being positive, is the fact that it seems to occur on the lowest leaves- ie: the ones farthest from the light source.

This, and one of the photos, leads me to another thought. Is it possible that while watering, you splashed some nutrient solution on the affected leaves? I did see drippers though, so you'd prolly have to be supplementing with hand watering.

If I had to pick one of the two, it would be the former. Let's not rule out other possibilities yet, though. I'm sure others will chime in...

HuffAndPuff

[EDIT: 420th POST!!!]

 

[MynameStitch]

can you take some pics without the hps on? Like huff said the pics are hard to really see what is wrong.

 

[wacked]

Sorry I should have metioned this before, there under 2, 400w sontagro's, been under 18 hours light for 21 days from clone, the plants I having the trouble with are being hand water so it's very posible that I've spashed some nutrient on the leaves, the other 2 at the back of the room are in a perlite vermiculite mix and are on 15 flow every 3 hours and these are doin fine, the lights have been raised to 60cm above the plants, I used the tap water today along with ph down got it down to 6 with a mix at 2ml per ltr, 2 ltrs per plant twice a day, Im also folar feeding in the morning and folar spraying with rain water every everning as lights go off. i will get some better pic's when the lights come back on tonight.

Cheers Wacked

 

[HuffAndPuff]

Ok, so it could be nute splash, then. Look up light burn, and see if those pics look at all like it though, because that much light on young clones could also cause this, potentially.

FYI, I don't mean that the light has crisped the leaves from heat, either indirectly or because a light was touching a leaf, for example. What I'm talking about is a situation where the light is basically too strong for the plant, and it causes bleaching, and tears/holes in foliage.

When the lights come on, make sure you take the photos in a place with some good neutral lighting, not under the HPS. You prolly got that, but I don't want you to have to post shit three times.

Ok, I gotta go write this paper....
HuffandPuff

 

[wacked]

I managed to snap a pic before the battery in my camera went flat, HuffandPuff It does look a lot like nute burn in the pic, I think you might be right.
will get some more pic's when the camera charges up.

Cheers Wacked

 

[HuffAndPuff]

Based on that pic, I'm going with nute splash. If you look at the photo, it almost looks like you poured the solution into the gap at the top part, and then when you finished pouring, you pulled your arm straight back, across the plant, where some more dripped off the bottom of the container and splashed the plants. With the color issue resolved, it is clear it is not the light burn it resembled in earlier photos. So, until you post more photos, that's what I'm going with. And if you ignore that, the rest of the plant looks pretty damn hearty.

HuffAndPuff

 

[wacked]

Thanks huffandPuff, here's some more pic's.











Cheers Wacked

 

[MynameStitch]

How often are you feeding your plants...
How are you testing your ph, need to know the exact ph if possible. what mixture of soil are you using?

How often are you testing your ph? 3 ml per liter is ALOT of nutrients...... you could be causing your ph to go lower with that amount of nutrients man.....

2ml per ltr, 2 ltrs per plant twice a day

That's insane dude......

m also foliar feeding in the morning and folar spraying with rain water every evening as lights go off. i will get some better pic's when the lights come back on tonight.

Never foliar spray at night before lights go off; you have a higher chance of raising your humidity and you do not want to invite powdery mildew.

Are you foliar feeding and watering with feedings too?????

 

[Stoned Cold]

It looks to me like 'nute splash'. Did I miss the temps?
Would pic#4 be a manganese def.?

 

[MynameStitch]

No, mangaense are extremely rare and I have only seen 2 cases of it.

 

[wacked]

temps are stable runs between 25 degree c and 27 dgrees c , sometimes I do get the odd temp spike upto around 31 degrees c, when lights are off it stays around 20 dgrees c, I've stopped folar feeding and started a flush as Im going to switch lights to 12 12 in a couple of days.
My humidity is high at the moment at 80% Im not to worried about this at the moment, I've got the fans running on high to help bring it down, but we've had lots of rain over the past few days, out side humidity is at 95%.

Cheers Wacked

 

[10k]

Never foliar spray at night before lights go off; you have a higher chance of raising your humidity and you do not want to invite powdery mildew.

Not to mention the problem a plant can have with getting rid of all that transpired moisture during the darkness...and the problem of it 'back feeding' foliarly if that moisture dosent get evaporated off the plants in such high rH conditions.

with a mix at 2ml per ltr, 2 ltrs per plant twice a day, Im also folar feeding in the morning

Pfeeew thats an awful lot of feeding. Pics look VERY green. I suspect an N tox begining soon.

 

[R.A.]

"Pfeeew thats an awful lot of feeding. Pics look VERY green. I suspect an N tox begining soon."

Good prediction from 10K and good advice from everyone else here.

The only time i would spray my plants is to remove a pest, or if nutes where spilled on them.

I would stop Foliar feeding and never do it again. Ever. You actually make it hard for the plants to transpire, plus you have all that humidity coming from outside.

Simply, water when soil is dry.

Nice looking plant, good potential. Let it do it's thing.

 

[MynameStitch]

and the problem of it 'back feeding' foliarly if that moisture dosent get evaporated off the plants in such high rH conditions

Hey 10k what do you mean by back feeding?

 

[wacked]

thanks to everyone for the help, I've flushed them all with rain water, everything is looking good today and there's no sign of nute burn on the new growth.

I've got the humidity back down around 68% , temps are around 27 degree's c , Im going to 12/12 this week, Im using the canna coco A+B nutes.

So when should I start to feed the plants again?


Cheers Wacked

 

[10k]

Hey 10k what do you mean by back feeding?

MynameStitch, in some enclosed grows, especially totally enclosed hydro grows with poor circulation and exhaust flow, where the RH goes very high at night, the moisture output from the foliage during night time (transpiration) can be so extreme that it has no way of evaporating off the plants. In effect, the plants become soaking wet and stay that way until the lights come back on, and then some of this wetness gets re-absorbed back into the plant, just like a soaking wet foliar spraying. It can interfere with nute uptake in the process, and eventually causes mold and bud rot if it continues. Always the worst in flowering because the buds have many closely and tightly packed calyxes and foliage to grab onto and hold that excessive moisture.