• Home
  • Forums
  • Medical Cannabis Cultivation
  • Cannabis Infirmary
  • What's Going On?

What's Going On?

  • Thread starter Thread starter PharmTox13
  • Start date Start date Sep 7, 2017
  • Tagged users Tagged users None

What's Going On?

PharmTox13 Sep 7, 2017 10 Replies 1,177 Views
Page 1 of 1 · Replies 1–11 of 11
1
P

PharmTox13

Posts
3
Reactions
2
Joined
Sep 7, 2017
Points
3
Sep 7, 2017
#1
Hey Folks,

So my plants look very happy except various leaves are dried up and brittle, showing browning along the edges. I've posted pics to help with the description. Plants are being grown in an outdoor closet with air from inside the house routed into the closet. I've also got an exhaust fan on the door of the outdoor closet. pH is fine at 6.5 and plants are in FFOF. Temps have hovered around 70-80 over the last week since I started flowering, but prior to that temps got up to 90F but this was uncommon. Veg temps consistently 80-85F. Humidity between 40-55% RH. I've fed them a couple times with FF Big Bloom and Grow Big, but backed off because I saw some of the leaf tips were burnt. Any insight into what is going on? Our water recently switched from groundwater to mostly surface water which is much more soft-could this be a cal-mag deficiency of some sort? Thanks for any help.
 

Attachments

  • whats-going-on.jpg
    122.2 KB · Views: 109
  • whats-going-on-2.jpg
    189.1 KB · Views: 101
  • whats-going-on-3.jpg
    212.1 KB · Views: 101
  • whats-going-on-4.jpg
    163.9 KB · Views: 102
Quote Reply
G

GrowingBeard

Posts
10
Reactions
4
Joined
Jul 30, 2017
Points
3
Sep 7, 2017
#2
I just posted a moment ago about a different issue but I think you are dead on with the call of Cal-Mag deficiency. I started with similar issue to what you have and cleared it right up with CaliMagic. Good luck!
 
Quote Reply
G

GrowingBeard

Posts
10
Reactions
4
Joined
Jul 30, 2017
Points
3
Sep 7, 2017
#3
This may help too. It is what I'm using until I can get some advice.

https://www.thcfarmer.com/community/threads/there-is-no-such-thing-as-a-cal-mag-deficiency.62747/
 
Quote Reply

Leew421

Posts
1,632
Reactions
5,116
Joined
Mar 1, 2017
Points
263
Sep 8, 2017
#4
I would move away from cal-mag and get some epsom salt and biomin calcium. The calcium is fully chelated. Most likely you have a lock out. To help this you need lots of RO or distilled. Run about 3 gallons of water and then on the last gallon run calcium and Epsom salt. 3 days later do it again except this time run a low dose of nutrients and add calcium again. The purple stem clear up from a proper dose of Epsom salt. I usually do 1/2 cup epsom to 30 gal water and I'll do 4-5 oz calcium to my res. Of course you can scale it down to your needs. I would do a tsp of Epsom and 2 tsp calcium. Clears up over a week. Check new growth for necrosis or spots
 
Reactions: GrowingBeard
Quote Reply

Leew421

Posts
1,632
Reactions
5,116
Joined
Mar 1, 2017
Points
263
Sep 8, 2017
#5
I would also stop using any pH up or down
 
Quote Reply
G

GrowingBeard

Posts
10
Reactions
4
Joined
Jul 30, 2017
Points
3
Sep 8, 2017
#6
Excuse the newbie question but is RO or distilled water already at a proper ph? Or why would you stop?

Leew421 said:
I would also stop using any pH up or down
Click to expand...
 
Quote Reply

Leew421

Posts
1,632
Reactions
5,116
Joined
Mar 1, 2017
Points
263
Sep 8, 2017
#7
The soil is the buffer. If you add pH up and down you throw the soil out of whack. Ro or distilled is 7 and very neutral.
 
Reactions: GrowingBeard
Quote Reply
P

PharmTox13

Posts
3
Reactions
2
Joined
Sep 7, 2017
Points
3
Sep 8, 2017
#8
Leew421 said:
The soil is the buffer. If you add pH up and down you throw the soil out of whack. Ro or distilled is 7 and very neutral.
Click to expand...
While RO/distilled water should have a pH of 7, it has no minerals in the water so therefore it has no buffering capacity. This means adding pH down to RO water will reduce the pH much more than if you were to add pH down to hard water. The minerals in "hard" water act as a buffer. I would agree that the soil acts as a buffer, but I don't see how adjusting the pH of my water will throw off the pH of my soil. I tested the pH of my soil and it was 6.5, the same pH of the water I put in the soil. The only thing I can think of is that salts formed from adding acid (remember your standard neutralization reaction of an acid with a base) and this may inhibit absorption of nutrients at the roots, but this seems rather farfetched. It definitely seems better than the alternative which is to not add any pH adjuster and give the plants highly acidic (pH of ~6) water when adding fertilizer, which would definitely cause nutrient lockout.
 
Reactions: GrowingBeard
Quote Reply

Leew421

Posts
1,632
Reactions
5,116
Joined
Mar 1, 2017
Points
263
Sep 8, 2017
#9
The pH up and down stay in the soil causing issues that shouldn't be there. Just cause the water goes in a certain pH doesn't mean it will stay.
 
Quote Reply

KlipschGuy

Posts
282
Reactions
277
Joined
Sep 17, 2017
Points
63
Sep 18, 2017
#10
That doesn't appear to be ph fluctuation to me. It doesn't look like a common nutrient deficiency or toxicity. That could be to early stages of root rot. I hope I'm wrong!
 
Reactions: GrowingBeard
Quote Reply

KlipschGuy

Posts
282
Reactions
277
Joined
Sep 17, 2017
Points
63
Sep 18, 2017
#11
I'm 29 days bloom today and I don't have nothing like that going on.
 
Quote Reply
Page 1 of 1 · Replies 1–11 of 11
1

Thread info

Replies 10
Views 1,177
Started Sep 7, 2017
Latest post Sep 18, 2017
Starter PharmTox13
Forum Cannabis Infirmary

Latest posts

  • Eternal Sun 2026 outdoor garden grow
    • Latest: EternalSun
    • 3 minutes ago
    General Outdoor Growing
  • J
    Is it ready to harvest
    • Latest: josh65
    • 3 minutes ago
    Photography Help
  • Are my seedlings too slow? (10 Days old)
    • Latest: juliando
    • 36 minutes ago
    General Indoor Growing
  • how to Bubble washing and tips 2024
    • Latest: Derelict999
    • 41 minutes ago
    Concentrates & Processing
  • 2026 Outdoor Grows! let's see em!
    • Latest: grayoldnproud
    • Today at 6:28 PM
    General Outdoor Growing
  • Home
  • Forums
  • Medical Cannabis Cultivation
  • Cannabis Infirmary
  • What's Going On?
  • Contact us
  • Terms and rules
  • Privacy policy
  • Help
  • Home
Community platform by XenForo® © 2010-2026 XenForo Ltd.
Menu
Log in

Sign up

  • Home
  • News
  • Classifieds
  • Forums
    • What's new Featured content New posts New Articles New articles New products Latest activity
  • Social
  • Strains
  • Live
  • Learn
  • Brands
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?