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Old 03-10-2018, 10:40 AM #1
baxbax
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help me with this problem in 100 % coco ?

hello , this plant is 28 days since sprout it was doing fine when I started it in fresh coco , but now I have deficiency in it , I feed ro water my last watering : ph in 5.9 ph out (run off ) 6.2

What Strain is it? Critical kush from royal queen seeds
Is it Indica, Sativa or Hybrid? I think it is indica What percentages? ???
How Many Plants? 1
Is it in Vegetative or Flowering Stage? vegetative
If in Vegetative Stage... How Long? 27 days since sprout
If in Flowering Stage... How Long? -----
Indoor or Outdoor? indoor
Soil or Hydro? soilless 100 % coco coir
If Hydro, Reservoir size?
If Hydro, Reservoir Temperature?
If Hydro, what type of Medium?
If Hydro, what type of Setup?
If Soil... What is in your Mix? 100% coco
If Soil... What Size Pot? 1 gallon fabric pot
Size (Wattage) of Light? How Many? 65 watt cfl
Is it Air Cooled? yes
Temperature of Room/Cabinet? btween 20 and 25
RH of Room/Cabinet? 40 to 50 percent
PH of Medium or Reservoir? watering with ph of 5.5 run off > 6.2
Any Pests? no
How Often are you Watering? every 3 days
Type and Strength of Fertilizers used?
urea nitrogen 20 % > 1 ml per gallon
pk booster > 1 ml per gallon
general hydroponics bioweed > 1 ml per gallon
minerals complex (all trace minerals) > 1 ml per gallon
cal mag 1 ml per gallon
Size or Square Footage of Room? cabinet grow


plant at day 15 :



day 28 :





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Old 03-10-2018, 12:26 PM #2
low_and_slow
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5.5 in, 6.2 out...too high pH!

Are the rust spots mostly on the older lower leaves?
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Old 03-10-2018, 12:55 PM #3
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Quote:
Originally Posted by low_and_slow View Post
5.5 in, 6.2 out...too high pH!

Are the rust spots mostly on the older lower leaves?
I watered 5.9 and still read 6.2 , when plant was 15 days old I was feeding 6.1 and run off was 6.8 ( picture ) , yes they are at lower leaves and new growth is looking fine as new grow start to grow , lower leaves become spotted .
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Old 03-10-2018, 01:12 PM #4
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could this be rootbounded ?
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Old 03-10-2018, 02:25 PM #5
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Mg is locked out probably, as new growth develops the plant strips it from the lower leaves and you get those spots. Are you measuring the strength of your nutrients with a meter?
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Old 03-10-2018, 03:02 PM #6
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Quote:
Originally Posted by low_and_slow View Post
Mg is locked out probably, as new growth develops the plant strips it from the lower leaves and you get those spots. Are you measuring the strength of your nutrients with a meter?
no , I started feeding by 1 drop of each nutrients when plant was little seedling and started as plant grow , These spots happen after I topped plant and flushed coco with 5.5 ph after this I saw these spots ,
I just flushed plant recently with 20 gallon of 5.5 ph ,today I watered with ph of 5.9 and 1 ml of calcium magnesium for each gallon .
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Old 03-10-2018, 03:03 PM #7
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could this be calcium deficiency ?
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Old 03-10-2018, 03:47 PM #8
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Never ever ever water coco with plain water. ALWAYS water with nutrients. If you don't, you'll strip the cation bank.

I water plants from seed / clone through the beginning of flower with the same strength nutrient solution - 1.2-1.4EC. At least 2 times per day. It's that simple.
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Old 03-10-2018, 04:44 PM #9
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after feeding with ph of 5.9 ( compare this to 5.5 I was doing before ) and good aount of calcium magnesium plants feel much better I can tell this just few hours after feed plant growing better . is it possible with my nutrient line I use or my stuff higher ph like 5.9 or 6.0 work better ? as it is pure coco
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Old 03-10-2018, 05:05 PM #10
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Quote:
Originally Posted by baxbax View Post
after feeding with ph of 5.9 ( compare this to 5.5 I was doing before ) and good aount of calcium magnesium plants feel much better I can tell this just few hours after feed plant growing better . is it possible with my nutrient line I use or my stuff higher ph like 5.9 or 6.0 work better ? as it is pure coco
Anything between 5.4 and 6.3 is fine. Your problem is not pH, your problem is feeding plain water to coco, which should never ever ever be done. Feed your plant 1.2-1.4 EC nutrient solution every time you water it, a minimum of twice per day. I guarantee your problems will go away.
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