Organic Run - Burnt tips - Toxicity?

[hightech316]

Gromies!

She is seems to be getting worse. 2nd week of flower.
Adjusted for mag and nitro deficiency , off and on the entire run. She Also experienced nutrition lockup last month . Shes been through it .

76 degrees / 30 RH .
3 Gallon Pro-Mix .
Gaia Greens All purpose / Flower top dressing .
Distilled / Purified water around 6 pH.
Medigrow Sun v2 - 320w Light .

Is this some sort of toxicity ?

 

[Gmix]

Well your ph is wack
Soil should be 6.3-6.9
Your growing organicly you shouldn’t be adjusting the ph
The distlted water isn’t helping it has all the goodness removed

 

[carlosescobar]

have you got the light on 100% or less than 12 inches from the plant ? that looks to me like light stress which locks out potassium (yellowing of the leaves with dark green veins) i think the random brown spots are calcium defeciency, and calcium magnesium and potassium all compete for space on the roots...? I see this issue a lot so i wonder if we are feeding with too much cal mag , when it might already be in our base nutrients , and perhaps too much magnesium will lock the other two out ,
your RH seems a bit low i wonder if the high temps and low rh has stressed it ?

 

[RootFarmer]

have you got the light on 100% or less than 12 inches from the plant ? that looks to me like light stress which locks out potassium (yellowing of the leaves with dark green veins) i think the random brown spots are calcium defeciency, and calcium magnesium and potassium all compete for space on the roots...? I see this issue a lot so i wonder if we are feeding with too much cal mag , when it might already be in our base nutrients , and perhaps too much magnesium will lock the other two out ,
your RH seems a bit low i wonder if the high temps and low rh has stressed it ?

How exactly does light stress lock out K? Could you explain how that works and where you got your info from because I'd like to read about it. Same for the roots space competition. I read A LOT of stuff but never ran across any of that. I'd love to read about it.

 

[LoveGrowingIt]

2nd week of flower.

Do you mean the second week since changing the light schedule? Actual flowering begins a week or two after changing the light. Until then, the plants stretch, which is very much like vegetation as far as nutrients are concerned.

Adjusted for mag and nitro deficiency, off and on the entire run. She Also experienced nutrition lockup last month Shes been through it.

I see indications of Mg deficiency.

76 degrees / 30 RH.

The RH is too low. That can cause necrotic leaf tips.

3 Gallon Pro-Mix.
Gaia Greens All purpose / Flower top dressing.
Distilled / Purified water around 6 pH.
Medigrow Sun v2 - 320w Light.

Gaia Green nutrients are organic. Usually, there's no need to use distilled water or to adjust the pH when using organic nutrients.

There typically no need to adjust the Ph of distilled water. Tap water usually has dissolved minerals that are beneficial for the plant. Problems with tap water are possible, but rare.

Is this some sort of toxicity ?

I doubt it. I suggest increasing the RH to 55% till the plants recover. It can be lowered gradually as the plant is further into flowering. I also suggest adding Mg. Epsom salt at 1 tablespoon per gallon of water works well for that. Correct the Mg deficiency before "fixing" other problems. Keep using it till a few weeks before harvest. Adding beneficial microbes might be helpful, too.

 

[OODAloop]

You dont think humans overthink things trying to be perfectionists do ya? They dont look that bad.

 

[hightech316]

Do you mean the second week since changing the light schedule? Actual flowering begins a week or two after changing the light. Until then, the plants stretch, which is very much like vegetation as far as nutrients are concerned.


I see indications of Mg deficiency.


The RH is too low. That can cause necrotic leaf tips.


Gaia Green nutrients are organic. Usually, there's no need to use distilled water or to adjust the pH when using organic nutrients.

There typically no need to adjust the Ph of distilled water. Tap water usually has dissolved minerals that are beneficial for the plant. Problems with tap water are possible, but rare.


I doubt it. I suggest increasing the RH to 55% till the plants recover. It can be lowered gradually as the plant is further into flowering. I also suggest adding Mg. Epsom salt at 1 tablespoon per gallon of water works well for that. Correct the Mg deficiency before "fixing" other problems. Keep using it till a few weeks before harvest. Adding beneficial microbes might be helpful, too.

Thanks everyone for chiming in!
Thank you for in depth response .

In the vegging phase, I over did it. Used Gaia Green All purpose , I also put a few extra amendments. The ones I had added , ended up also being in the all purpose blend ( I have learned alot of what NOT to do now ) . I believe that through her into nutrient lock .

This is my second week since light schedule change to 12/12.

Yeah, Once I took out the humidifier, these issues started worsening . I am going to up the RH back up.

Now she is in a 3x3 lights hung at 21" , I'm hoping these issues will start resolving .

I'm concerned about cranking lights from 40% to 100%. These leafs do not seem healthy enough to take all of it, I am gradually going up .

Currently at 60% for 2 days, Which the plant is loving .

 

[carlosescobar]

View attachment 2376470View attachment 2376472



How exactly does light stress lock out K? Could you explain how that works and where you got your info from because I'd like to read about it. Same for the roots space competition. I read A LOT of stuff but never ran across any of that. I'd love to read about it.

https://issuu.com/sandrasoftsecrets/docs/gb-softsecrets_issue-2023-06 page 22 but i think i learnt about lights locking out potassium watching youtube vids

 

[hightech316]

Well your ph is wack
Soil should be 6.3-6.9
Your growing organicly you shouldn’t be adjusting the ph
The distlted water isn’t helping it has all the goodness removed

That's what I figured, the soil should buffer the pH.

Would using RO purified drinking water be a better substitute ?

I've been adding little bit of Epson salt the distilled water to bring EC up.

 

[carlosescobar]

View attachment 2376470View attachment 2376472



How exactly does light stress lock out K? Could you explain how that works and where you got your info from because I'd like to read about it. Same for the roots space competition. I read A LOT of stuff but never ran across any of that. I'd love to read about it.

i just found the vids but because its age restricted i cant post them here, it appears to happen in the veg stage a lot because the plants dont need that much light in veg as they do , and can handle in flower, and apparently you can combat it by introducing Co2 .(and i would assume turning the light down a bit)

 

[hightech316]

the plants dont need that much light in veg as they do , and can handle in flower,

Right.

I went through light stress .

Came across this great calculator to get the correct Daily light integral (DLI) .
https://growlightmeter.com/calculator/ .

 

[Gmix]

i just found the vids but because its age restricted i cant post them here, it appears to happen in the veg stage a lot because the plants dont need that much light in veg as they do , and can handle in flower, and apparently you can combat it by introducing Co2 .(and i would assume turning the light down a bit)

You can post age restricted vids here

 

[Gmix]

That's what I figured, the soil should buffer the pH.

Would using RO purified drinking water be a better substitute ?

I've been adding little bit of Epson salt the distilled water to bring EC up.

Tap water is best
Ro sucks again it has everything good for the plant removed.

You can’t read ec in organic feed you shouldn’t even be bothering with ec it’s has no relevance when growing organicly

I would stop adding Epsom salts to the water. It’s a source of mg witch you might be overdoing

Are you adding any calcium

Your in flower now the you really need a food with a higher pk compared to n

The all purpose was good for veg however for flower you really want a bloom feed

 

[hightech316]

Tap water is best
Ro sucks again it has everything good for the plant removed.

You can’t read ec in organic feed you shouldn’t even be bothering with ec it’s has no relevance when growing organicly

I would stop adding Epsom salts to the water. It’s a source of mg witch you might be overdoing

Are you adding any calcium

Your in flower now the you really need a food with a higher pk compared to n

The all purpose was good for veg however for flower you really want a bloom feed

Thanks, I only add a pinch of agricultural grade Epson . Good to know I can stop , and EC is no factor.

last top feed two weeks ago was half all purpose and half bloom.
Once she dries , I'll give her a top feed of full Gaia bloom dose. ( Cannot be any worse than now ) .

So yeah, Originally during veg I added did Calcium, and during transplant . Via Fish Bone Meal as well as kelp ,alfalfa meal etc . That was added on top of the Gaia Greens dose of All Purpose . ( We learn from our mistakes. Lesson Learned ).

A language model told me Too much C could of locked out less Mag intake . Check out what Claude.ai had to say about my soil recipe .

Let me analyze these ingredients for potential issues with cannabis cultivation:


This combination of ingredients generally provides a well-rounded nutrient profile, but there are a few considerations to watch for:


Potential Issues:

1. Salt Build-up:

• Worm castings + Bone Fish Meal together can lead to salt accumulation
• Watch for leaf tip burning or nutrient lockout

1. Nutrient Overlap/Excess:

• Multiple calcium sources (Gypsum + Bone Fish Meal)
• Could potentially lock out magnesium uptake if too concentrated

1. pH Considerations:

• Bone Fish Meal can lower pH over time
• Gypsum is pH neutral but can affect nutrient availability

Deficiency Risks:

• Magnesium might become deficient due to high calcium levels
• Iron availability might be reduced due to pH fluctuations
• Nitrogen could become limited during heavy flowering

To avoid these issues:

1. Monitor plant leaves for signs of deficiency/toxicity
2. Consider reducing Gypsum amount since you have calcium from other sources
3. Test and maintain pH between 6.0-6.8 for optimal nutrient uptake
4. Consider adding:
   • A small amount of magnesium (like Epsom salts)
   • More nitrogen source for flowering stage

Would you like specific recommendations for adjusting any of these amounts?

 

[Bobcat.Branch]

My concern here is unwarranted pH adjustments possibly causing nutrient(s) lockout, and unwarranted EC adjustments/overfeeding.

Testing your runoff after watering will let you know if pH is terribly out of whack. I'd be interested in EC/ppm of the runoff, as well.

 

[Gmix]

My concern here is unwarranted pH adjustments possibly causing nutrient(s) lockout, and unwarranted EC adjustments/overfeeding.

Testing your runoff after watering will let you know if pH is terribly out of whack. I'd be interested in EC/ppm of the runoff, as well.

You cannot get ec readings in organic grows !

 

[Bobcat.Branch]

You cannot get ec readings in organic grows !

See... That's me and my stupid hydro brain again. And I'm going back to soil and organic, why?

I mean, you can get readings, but yeah I see what you're saying.

 

[Gmix]

See... That's me and my stupid hydro brain again. And I'm going back to soil and organic, why?

I mean, you can get readings, but yeah I see what you're saying.

lol I do it all the time with regulars vs fems lol we all do it

Have fun bud

 

[hightech316]

You cannot get ec readings in organic grows !

I am only growing in a 3 Gallon pot, and definitely do not plan on recycling this "tainted" soil. I'll test run off after chop See where pH is .

My concern here is unwarranted pH adjustments possibly causing nutrient(s) lockout, and unwarranted EC adjustments/overfeeding.

Testing your runoff after watering will let you know if pH is terribly out of whack. I'd be interested in EC/ppm of the runoff, as well.

That's my main concern now. Water .

I've been buying gallons of distilled water . The first couple times I watered , I checked pH . Was consistent 6ish . So I figured all distilled water was basically neutral , and around that pH . Then I read somewhere, Distilled water pH changes when O2 hits. That made me check this last gallon and reading was 5.0 !

And I understand that water pH value doesn't have a huge impact when growing organic / living soil. Due to natural buffers in the amendments .

The way this run went, I am surprised shes alive !

Learned a lot from this ! Hopefully I can still get her to fully flower

 

[Gmix]

I am only growing in a 3 Gallon pot, and definitely do not plan on recycling this "tainted" soil. I'll test run off after chop See where pH is .

That's my main concern now. Water .

I've been buying gallons of distilled water . The first couple times I watered , I checked pH . Was consistent 6ish . So I figured all distilled water was basically neutral , and around that pH . Then I read somewhere, Distilled water pH changes when O2 hits. That made me check this last gallon and reading was 5.0 !

And I understand that water pH value doesn't have a huge impact when growing organic / living soil. Due to natural buffers in the amendments .

The way this run went, I am surprised shes alive !

Learned a lot from this ! Hopefully I can still get her to fully flower

Ro water & distilled water are 2nd par to tap water as tap water has lots of trace elements your plants like

Is there a reason you don’t use it

if you do let it sit for 24hrs to gas off chlorine if they still use that were your at otherwise it’s top dollar compared to Ro & distilled unless your city warns you about a excess of x in it & not to drink it for x amount of time you’d be far better off just using that

Saying you money to boot