yellowing leaves? Plants have me guessing...

[spadedNfaded]

SOIL:

How long has this problem been going on? last couple weeks
What STRAIN are you growing? MInistry of Cannabis WW and a chocolope bagseed
What was the establishing technique? (seed or clone?) clones of the original plants
What is the age of your plants? week or two veg, week 4 flower
How long have they been in the soil mixture they are in now? since 12/12
How Tall are the plants? approximately 12, 15, 18 inch
What PHASE (seedling, vegetative or flower) are the plants in? flower
What Technique are you using? (SOG, SCROG etc)
What size pots are you using? (Include how many subjects to pot) 1gal growbags
What substrate/medium are you using? What brand of soil mixture are you using?(percentage of perlite, vermiculite...etc?) promix potting soil 3:1 to perlite, 2 tablespoon per gallon pelletized garden lime Espoma, didn't have the powdered stuff that i have now
What Nutrient's are you using? Lucas Formula GH micro/grow
How much of each nutrient are you using with how much water? *Knowing the brand is very helpful* SEE POST FOR FEEDING SCHEDULE
How often are you feeding? "
If flowering, when did you switch over to using Bloom nutrients?
What order are you mixing your nutrients? (example: veg nutes 1st, bloom 2nd ect)
What is the TDS/EC/PPM of your nutrients used? Always buffered to 6.5-6.7 ph
What is the pH of the "RUN-OFF"?
What method of pH test was administered? Using Strips? pH pen? Hanna pH/TDS black pen kept in storage solution. Cleaned via instructions and re-calibrated every 1.5months
How often are you watering?
When was your last feeding and how often are you feeding?
What size bulb are you using? 400w HPS
What is the distance to the canopy? >12"
What is your RH Factor? (Relative Humidity) ~40-45%
What is the canopy temperature? 78-80 lights on
What is the Day/Night Temp? (Include fluctuation range) 78-80 lights on, 69-71 lights off
What is the current Air Flow? (cfm etc.) 172cfm, 2 circulating fans
Tell us about your ventilation, intake exhaust and when its running and not running ?scrubber to exhaust, independent cooltube
Is the fan blowing directly at plants?1 4" fan blowing at cooltube, 1 6" oscilating desk fan on the ground, blowing at/around the bases of the plants
Is the grow substrate constantly wet or moist? no
Is your water HARD or SOFT? filtered tap water using Mr Clean CarWash DIY, bubbled for 24 hours
What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water?
Are you using water from a water softener?
Has plant been recently pruned, cloned or pinched?
Have any pest chemicals been used? If so what and when? no
Are plant's infected with pest's? no


Ok, these are from clone, received 1/2 str lucas under CFLs for 1-1.5 weeks before being put into flower.
First time then dried out (~4-5 days)they got 6.5ph water till runoff then:
~4-5 day intervals
Lucas formula 8ml/16ml GH micro/bloom
6.5 water flush cuz i noticed they were yellowing then
Lucas formula 8ml/16ml GH micro/bloom
That didn't help so i flushed again and did Lucas at 6ml/12ml micro/bloom because i thought they might've been being burned.

THey've stayed like this since and i'm trying to figure out if it's a burn or a deficiency. It really looks like it need N.....like it needs to green-up. What do you think?

BTW i know the Chocolope bagseed looks heat stressed but i assure you it's been adequately away from the bulb and it's about 75-78 degrees around that plant at all times during lights on. it gets cooler when lights are off, my ChemDDs are purpling naturally with no A/C.

WW2

WW1

Chocolope Bagseed

any ideas?? Thanks!!!

- SubN

 

[Tonatiuh]

honestly bro,it looks like they didnt get enough N during veg and the stretch yellowed them up.other then that they look health..you could get some earth worm castings and top dress the pots and mix it in the 1st inch or so,you should be able to get them to green up for you...also id be gettin some cal-mag on them soon or that will be the next issue i think bro...also right about now it looks like they might be beggin you for phos...
peace-T-

 

[spadedNfaded]

hmm, interesting. I would've done the earthworm casting addition to the soil mix but the trouble is i cant find any anywhere, unless i just don't know where to look?

I have cal-mag, too. i can use that.

So full str lucas formula is not enough for these strains?

- SubN

 

[EvilTwin]

sNf,
A couple other things can cause yellowing. Soil staying too wet and being rootbound. But if it's not either of those...they need more N. They have a ways to go and will probably run out of steam if you don't give them a boost.
ET

 

[spadedNfaded]

I just did a bit of research and stumbled onto a potential supplier of EWCs.

I gave them a bit of water yesterday until they drained.
How much EWCs should i mix in the top inch of soil?

Mix in EWCs first inch, feed with 8ml/16ml micro/bloom and 1tsp/gal Cal-Mag? .5tsp?

Thanks for your opinions, id like to get this right on the first shot!!

- SubN

 

[spadedNfaded]

The potential source of EWCs said they only carry them in the summertime.

I fed them 9ml/16ml micro/bloom and 1/2 tsp cal-mag per gallon.
the 3 plants shared the feeding, they each get like ~40oz

- SubN

 

[EvilTwin]

SnF,
Put in worm castings in eBay and you'll get over 50 hits of sellers offering worm castings in various amounts.

You're far enough from harvest that you can get away with chemical nutes right now...but you've started flowering behind the curve so later you might need some castings.
ET