Deficiency or toxicity?

[diseasedmind]

Deficiency or toxicity?

 

[revegeta666]

Deficity!

Jus kidding, looks like a phosphorus deficiency to me.
Take a look at the pics see if they relate to your symptoms

How to fix Cannabis Phosphorus Deficiency (P) Pics & Symptoms

Phosphorus deficiencies cause dark splotches on leaves and can appear at the bottom of the plant on some of the oldest leaves. Learn to spot & fix the issue.

www.growweedeasy.com

 

[PadawanWarrior]

Full plant pics will help.

 

[TanzanianMagic]

Deficiency or toxicity?


View attachment 18974558

A leaf doesn't suffer from deficiency or toxicity, plants do.

 

[chronosync]

temps and humidity? night/day tent and root zone temps?
are you venting air? are you mixing the air in the tent/space with circulation fans?
if you are venting air where is it going?

environment can play a role in this type of sever necrosis
too cold in the root zone will slow or stop P uptake, for instance

leaves that look like that can happen in un-ventilated spaces, not sure why exactly, other than that plants need to breathe

what was the last thing you fed them?

 

[Creeperpark]

Deficiency or toxicity?


View attachment 18974558

That is a good question friend, and it's asked a lot on many forums. For anyone to know what the soil problem is, the soil needs to be tested. It's so easy these days to check the liquid discharge or run-off and test it. If it's high, lower ppm or ec, if the ppm is low, then raise it with a complete fertilizer best suited for whatever growing stage the plant is in.

The answer to Deficiency of toxicity is easy to find the answer to.
Testing the runoff is the only real way to know for sure. All the other answers are just guess's until one stops and tests the runoff.

 

[TanzanianMagic]

Just a hint for newbies - this is the kind of list of information we're looking for - the more the better.

Minimum:

- medium used (brand, version)
- pH and EC or PPM of both the nutrients used and the medium.
- a picture of the whole plant where it's growing
- temperatures

The Complete Guide to Sick Plants, pH and Pest troubles!

I have put a lot of work into this for those who need it when I'm not around :) This thread has been updated 7/15/2010 All updates are in RED. Scroll down to the bottom for most of the updated stuff. If you need help please DO NOT post in this thread. Make a thread in the infirmary, or post...

www.icmag.com

*NOTE: Please Cut And Paste only the section that applies and add your response. The more information you can give the better and faster people can help you out.Pictures should be added to every thread to ensure a proper diagnosis, when using pictures please ensure your HPS if using one is not turned on while taking pictures, as the lighting hides the plants problems. Fill out

ARE YOU USING?

SOIL:


How long has this problem been going on?
What STRAIN are you growing?
What was the establishing technique? (seed or clone?)
What is the age of your plants?
How long have they been in the soil mixture they are in now?
Were they in the same mixture when they were seedlings/smaller plant? If not, what mixture were they in before?
How Tall are the plants?
What PHASE (seedling, vegetative or flower) are the plants in?
What Technique are you using? (SOG, SCROG etc)
What size pots are you using? (Include how many subjects to pot)
What substrate/medium are you using? What brand of soil mixture are you using?(percentage of perlite, vermiculite...etc?)
What brand Nutrient's are you using?
How much of each nutrient are you using with how much water? *Knowing the brand is very helpful*
How often are you feeding?
If flowering, when did you switch over to using Bloom nutrients?
What order are you mixing your nutrients? (example: veg nutes 1st, bloom 2nd ect)
What is the TDS/EC/PPM of your nutrients used?
What is the pH of the "RUN-OFF"?
How often are you testing pH/ppm/EC/TDS?
What method of pH test was administered? Using Strips? pH pen?
How often are you watering?
When was your last feeding and how often are you feeding?
What size bulb are you using?
How old is your bulbs?
What is the distance to the canopy?
What is your RH Factor? (Relative Humidity)
What is the canopy temperature?
What is the Day/Night Temp? (Include fluctuation range)
What is the current Air Flow? (cfm etc.)
Tell us about your ventilation, intake exhaust and when its running and not running ?
Is the fan blowing directly at plants?
Is the grow substrate constantly wet or moist?
Is your water HARD or SOFT?
What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water?
If using tap water, what is the ppm/EC/TDS of the water right out of the tap?(Only if you have a tds pen)
If using RO,Distilled,mineral water, what is the ppm/EC/TDS without any additives?(Only if you have a tds pen)
Are you using water from a water softener?
Has plant been recently pruned, cloned or pinched?
Have any pest chemicals been used? If so what and when?
Are plant's infected with pest's?


HYDROPONICS/Aero Ponics/Coco/Soiless/

How long has this problem been going on?
Are you growing in a PVC grow tent? (example: Hydrohut or any other non brand tents)
What system are you running? (DWC? Ebb flow? Aero? Water Farm? Flood Tables? and so on...)
What STRAIN are you growing?
What was the establishing technique? (Were the seed or clone?)
What is the age of your plants?
How long have they been in there mixture they are in now?(coco,soiless etc..)
How tall are the plants?
What PHASE are the plants in? (seedling, vegetative or flower) are the plants in?
What Technique are you using?
What substrate/medium are you using?(Hydroton, RockWool etc.)
What is the Water temperature?
What color are your roots? White? Brown? Are your roots slimy?
What Nutrient's are you using?(If growing soiless)
How much of each nutrient are you using with how much water? *Knowing the brand is very helpful*
How often are you feeding? (If using soiless)
How often are you giving nutrients? (If using soiless)
If flowering, when did you switch over to using Bloom nutrients?
What order are you mixing your nutrients? (example: veg nutes 1st, bloom 2nd ect)
What is the TDS/EC/PPM you are using
What is the pH of the "Tank"?
How often are you testing your pH/PPM/EC/TDS?
Are you sure your calibration is correct on your equipment?
When was your last watering?
What is your water temps?
When was your last feeding change? (ie. grow-bloom-micro-additional)
How often do you clean your system: example: Flush out water replace with clean water and nutrients?
What size bulb are you using?
How old is the bulbs you are using?
What is the distance to the canopy?
What is your RH Factor(Relative Humidity)?
What is the canopy temperature?
What is the Day/Night Temp? (Include flucutaion range)
What is the current Air Flow? (cfm etc.)
Tell us about your ventilation, intake exhaust and when its running and not running ?
Is the fan blowing directly at plants?
Is your water HARD or SOFT?
What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water?
If using tap water, what is the ppm/EC/TDS of the water right out of the tap?
If using RO,Distilled,mineral water, what is the ppm/EC/TDS without any additives?
Are you using water from a water softener?
Has plant been recently pruned, cloned off of or pinched
Have any pest chemicals been used? If so, What and When?
Are plant's infected with pest's