Yellowing fan leaves with black spots?

[TraneRek]

How long has this problem been going on? 1-2 weeks
What STRAIN are you growing?Bag seed
What was the establishing technique? (seed or clone?) From seed
What is the age of your plants? Day 18 of Flower (~3 weeks veg)
How long have they been in the soil mixture they are in now? 18 days
How Tall are the plants? LST-ed, ~10 inches
What PHASE (seedling, vegetative or flower) are the plants in?Flowering
What Technique are you using? (SOG, SCROG etc)LST
What size pots are you using? (Include how many subjects to pot) 1gallon jugs. 1 plant per pot
What substrate/medium are you using? What brand of soil mixture are you using?(percentage of perlite, vermiculite...etc?)Topsoil (40%), Soil (I'll get the name later) (40%), Perlite (20%)
What Nutrient's are you using?GH 3-part series
How much of each nutrient are you using with how much water? FloraMicro: 5ml/gal. FloraGro: FloraGro: 5ml/gal. FloraMicro: 5ml/gal Previously ... 2.5ml/gal. FloraBloom: 5ml/gal. For the past week or so.
*Knowing the brand is very helpful*
How often are you feeding? Every 3 waterings or so
If flowering, when did you switch over to using Bloom nutrients? About a week ago
What order are you mixing your nutrients? (example: veg nutes 1st, bloom 2nd ect) Micro, Gro, Bloom
What is the TDS/EC/PPM of your nutrients used? Don't have anything to measure this w/
What is the pH of the "RUN-OFF"? ~7-7.2
What method of pH test was administered? Using Strips? pH pen? Aquarium drops
How often are you watering? Every 3-4 days
When was your last feeding and how often are you feeding?Last feeding was last night.
What size bulb are you using?150W HPS
What is the distance to the canopy? ~7inches
What is your RH Factor? (Relative Humidity)30-40%
What is the canopy temperature? Lights on, around 85-88 (it's in a closet so it gets pretty warm)
What is the Day/Night Temp? (Include fluctuation range) I'll check next time I'm able
What is the current Air Flow? (cfm etc.)I think it's around 250CFM, but it's slowed a bit b/c of the carbon filter. I'd guess around 170CFM
Tell us about your ventilation, intake exhaust and when its running and not running ? Intake is on the lower part of the back wall. Exhaust through the ceiling. The fan is always on, as well as 2 PC circ fans. But it is in a pretty tight fit in a closet
Is the fan blowing directly at plants? Not really
Is the grow substrate constantly wet or moist? Somewhat I think.. I've been waiting longer in between waterings as of late
Is your water HARD or SOFT? Not exactly sure? It's un pH-ed tap water..
What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water? Un ph-ed Tap
Are you using water from a water softener? Is that like a water filter?
Has plant been recently pruned, cloned or pinched? No, but I've had quite a few fallen leaves >.<
Have any pest chemicals been used? If so what and when?No chemicals used.
Are plant's infected with pest's? No pests so far.




I've been getting this yellowing leaves w/ black splotches on them, but it's only on one plant.. The other two plants are a bit yellow and the leaves are a little droopy (overwatering I believe). A little help?

Thanks in advance,
-Rek

 

[Hydro-Soil]

What Nutrient's are you using?GH 3-part series
How much of each nutrient are you using with how much water? FloraMicro: 5ml/gal. FloraGro: FloraGro: 5ml/gal. FloraMicro: 5ml/gal Previously ... 2.5ml/gal. FloraBloom: 5ml/gal. For the past week or so.

Ok.... great nutes there. Plenty of what you need to grow nice plants.

So... for a 150w HPS I'd recommend somewhere around 0-5-10 or 0-6-12 as your mix ratio. No Grow, 5ml Micro and 10ml Bloom.
If you were running a 250W or higher HPS I'd say go with the 0-8-16 full str formula.

You can use this ratio throughout the grow without any deficiencies and you'll get awesome plants.


If you want the science behind it, follow the link in my sig for the Lucas Formula.

 

[10k]

TraneRek,
yes you're overwatering. do you have drainage holes in the bottoms of those bottles and are they possibly obstructed (ie plugged off by sitting on that flat floor). Overwatered will give you alot of def looking problems as well as stressing if not root problems.

It's unclear what gh mix you're using. Looks like you're in the transitional GH mix of "the 123" at half strength http://www.drugs-forum.com/growfaq/95.htm

IE: (ratio expressed in parts, each part being a teaspoon or 5ml) a 1g,1m,1b ratio,
but you said you had been feeding them what looks like an og,.5m,1b the past week or so. Why?
The above mixes are very weak strengths btw.
Please clarify that question?
And what if anything were they being fed in veg ?


HydroSoil, no need to send people off site in your signature, unlike the growfaq, we have a good lucas mix thread here at icmag.
http://www.icmag.com/ic/showthread.php?t=21119

 

[TraneRek]

Ahh I'd misinterpreted the feeding guidelines.. Ya I've been waay under-feeding. In veg they were getting .5g and .5m, 0b.

Thank you both for the help. I'll poke more drainage holes and follow those feeding instructions from here on out, and see if that fixes things.

Thanks again,
-Rek

 

[Hydro-Soil]

HydroSoil, no need to send people off site in your signature, unlike the growfaq, we have a good lucas mix thread here at icmag.
http://www.icmag.com/ic/showthread.php?t=21119

I'm not linked to the growfaq as it's inaccurate.

The lucas thread you mention is great for peeps like you and I but it does little towards explaining the lucas method. Noobs just get glazed eyes in the first 5 posts and go somewhere else.

Got a Lucas Tech that lays it out plain and simple anywhere around here, I'll link to that one if it's correct.