Early veg. brown spots

[Atulip]

What Strain is it? Fast and Vast Autoflower
Is it Indica, Sativa or Hybrid? What percentages? Indica
How Many Plants? 3 in the same container, 2 showing problems
Is it in Vegetative or Flowering Stage? Veg
If in Vegetative Stage... How Long? 19 days from germination
Indoor or Outdoor? Indoor
Soil or Hydro? Hydro DWC
If Hydro, Reservoir size? 10gal, 3 plants
If Hydro, Reservoir Temperature? 70℉
If Hydro, what type of Medium? Hydroton
If Hydro, what type of Setup? DWC
Size (Wattage) of Light? How Many? 130 true watts led x2
Is it Air Cooled? Yes
Temperature of Room/Cabinet? 75℉
RH of Room/Cabinet? 55-65%
PH of Medium or Reservoir? 6.0
Any Pests? No
How Often are you Watering?
Type and Strength of Fertilizers used? Gen Hydro Duo series 1/4 strength
Size or Square Footage of Room? 3'x3'



Two different plants showing defficiency. Noticed brown spots on the tips of one plant and kinda in the center of another's leaves.

My guess would be calcium lockout from too high ph. I'm using ph droplets primarily for checking ph, so there could be inaccuracies.

 

[yazz]

I had the same problem with some autos...gave cal/mag made sure ph was spot on and it solved the problem, hope this helps.

 

[Atulip]

Dropped ph to 5.6 according to my new meter. It was reading 6.2 so hopefully that's all it was.

 

[BuddroGreen]

In DWC you can let the pH swing from 5.6 - 6.2, it will allow the plant to absorb different elements at different pH. When it rises to 6.2, that's when you adjust it back done. Could be Mag from the LED's, they tend to make a plant use more Cal-Mag, also if you're using tap water it can do that as well.