First Grow (COCO) 1 out of 6 strains not playing ball

MisterTHC

MisterTHC

Member
Hello All,

long time reader, first time poster.

So i was hoping to get one grow under my belt before i came online and id my own journal but alas im having issues that i cannot get on top of for the life of me.

Ok a little background

Medium - COCO
Grow - INDOORS
Nutirents - General Hydroponic and CalMag ( runnin approx 500ppm)
Lighting - 140w CFL for veg and 1600W mars hydro LED for flower
Temps - 83 constant when lights on 72 when lights off

Humidity - 50% lights on 60% lights off
Schedule - Regular PH'd water in morning and Nutrients to 20% run off at night.
Method - SCROG/LST/TOPPING

PLANTS with issue 2 x Bubblegums ( week 3.5 flower)

SAME age plants with NO issues on same feeding schedule 0 1 x Currant Kush, Arjans Haze number1 and some autos

ALso have two autos in there a few week ahead of there sisters

Tale of the Tape
  • Noticed yellow tips on leaves two weeks ago ( assumed it was light burn and lifted lights an additional foot)
  • A few days later yellow tips were getting more pronounced (thought nute burn, ran half strength nutes for a week)
  • Tips started looking "rusted" see pics
  • I flushed with just P'Hd water 10-x the pots holding capacity
  • began regular nutes the following day
  • This is just starting to happen on the second bubble gum and has smaller rusted tips

from what i have read i may have MG deficiency, phosphorous or Zinc ??

Thank You community all the help!




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MisterTHC

MisterTHC

Member
Oh, washed and sterilized beach sand. got the idea off of another journal. it stops bugs from being able to enter the root zone as it acts like glass. the sand has been present from day 1 .

Anyone have any input? im lost
 
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420monster

420monster

Well-Known Member
What's your run off ph? especially with coco it can acidify over time and cause ph problems also what are you phing to? coco perfers hydro ph

I second mg
 
MisterTHC

MisterTHC

Member
420monster said:
What's your run off ph? especially with coco it can acidify over time and cause ph problems also what are you phing to? coco perfers hydro ph

I second mg
Click to expand...
superbak3d said:
MG def for sure.
Click to expand...
Magnesium huh.... so adding additional CalMAg should fix the problem? The thing is i am already using it in the same ration with the other plants. Could it be that this strain of bubblegum just has higher MG requirments?

420monster, my run off is 6.6 and going is is 5.8-6.0. using tap water with starting PPM of 83
 
Resinhound

Resinhound

Well-Known Member
well i dunno doesnt look anything like magnesium deficiency to me.Looks more like a P deficiency to me .I think those strains are P hungry apparently..In this case something like mag pro by dynagro is good, a source of phos and magnesium,i have an 8oz bottle ive had for a while,dont use it much,but i think its just what you need.
 
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MisterTHC

MisterTHC

Member
Now im torn Resinhound!.... any advise? anything i can do to make a determination? seeing as i am already giving CalMag P could be an explanation. What would be the best fix for COCO? im already feeding with GH Flora series
 
MisterTHC

MisterTHC

Member
regular tap water, i fill a 60l resevour and let it sit out for 48 hours PPM goes from 97 to around 80. I then mix nutes and PH and use the next day
 
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