A New Study on Deficiencies and finally some good Photos Published Jan 17 2023

[Choppr]

Foliar Symptomology, Nutrient Content, Yield, and Secondary Metabolite Variability of Cannabis Grown Hydroponically with Different Single-Element Nutrient Deficiencies

In controlled environment production systems, Cannabis sativa (hereafter cannabis) is a commodity with high nutrient demands due to prolific growth under optimized environmental conditions. Since nutrient deficiencies can reduce yield and quality, cultivators need tools to rapidly detect and...

www.mdpi.com

a must read article for the geeks (like me) -

 

[mysticepipedon]

Good stuff, but symptoms are not always the same on different cultivars, IMO. For instance, P and K deficiencies can look different from plant to plant.

I'd like to see them purposely cause a lockout and show mulitple problems at once, which is what growers normally face, rather than missing one single element.

 

[steamroller]

Decent info.
Someone posted it the other day.
I saved it then to use along with my other diagnostic guides.
Plus one with @mysticepipedon .
There is often more then one issue[ some secondary] that would be nice if recognized in their relationships.

 

[RootsRuler]

Good stuff, but symptoms are not always the same on different cultivars, IMO. For instance, P and K deficiencies can look different from plant to plant.

I'd like to see them purposely cause a lockout and show mulitple problems at once, which is what growers normally face, rather than missing one single element.

Decent info.
Someone posted it the other day.
I saved it then to use along with my other diagnostic guides.
Plus one with @mysticepipedon .
There is often more then one issue[ some secondary] that would be nice if recognized in their relationships.

Agreed. Too many variables to be able to pinpoint one specific cause. Maybe a flowchart of some kind showing the interconnecting relationships that bring about certain conditions?

 

[steamroller]

Maybe a flowchart of some kind showing the interconnecting relationships that bring about certain conditions?

Mulders chart is a good starting point.
I always like to have more resources than needed.


Stimulation: This occurs when the high level of a particular nutrient increases the demand by the plant for another nutrient. For example, increased nitrogen levels create a demand for more magnesium.

 

[RootsRuler]

I'm very angry at you.

 

[steamroller]

I'm very angry at you.

Moi?
It is almost past my bedtime.
Punish me as you see fit.

 

[RootsRuler]

You're holding out on us!!!!

Why have we not seen this before? This is awesome but do you have one with plant issues rather than nutrient ion reactions?

 

[steamroller]

I am sure there are in depth pages that would make a plant guru out of whoever read them [ AKA Aman].
Search Mulders chart I thought this one was plant related.
You need to combine the plant def guides with the chart to reach the most reasonable conclusion.
Eventually practiced enough it would be old hat I would think. More than a few frows probably?
I have 7 different deficiency guides [ 3 or 4 may be useless 95% of the time] and a couple articles on pest.
You really don't need to know the answer if you know where to look? When I see info of value, I save it.
When I bred tropical fish knowing disease and ailments was paramount.
One of my favorite disease links first sentence was " Know your enemy".
Having guides handy can be very helpful in determining your enemy.

 

[RootsRuler]

I am sure there are in depth pages that would make a plant guru out of whoever read them [ AKA Aman].
Search Mulders chart I thought this one was plant related.
You need to combine the plant def guides with the chart to reach the most reasonable conclusion.
Eventually practiced enough it would be old hat I would think. More than a few frows probably?
I have 7 different deficiency guides [ 3 or 4 may be useless 95% of the time] and a couple articles on pest.
You really don't need to know the answer if you know where to look? When I see info of value, I save it.
When I bred tropical fish knowing disease and ailments was paramount.
One of my favorite disease links first sentence was " Know your enemy".
Having guides handy can be very helpful in determining your enemy.

Agreed!! I post charts all the time for newbs so that they have some sort of guide to look to so they don't freak out!!!

 

[mysticepipedon]

You're holding out on us!!!!

Why have we not seen this before? This is awesome but do you have one with plant issues rather than nutrient ion reactions?

That chart has been posted a number of times here. It's one of my bibles.