Terminal calcium deficiency?

swantip · Mar 3, 2022

I believe this is a calcium deficiency right? It starts from the top of the plant and it is spreading down.I just got my hands on some calmag supplement, how much should i give per L? Is this saveable or it will destroy my plant?

Star Dog · Mar 3, 2022

Take a picture with the light off.

swantip · Mar 3, 2022

Here you go

Star Dog · Mar 3, 2022

swantip said:
Here you go

Deficiencies aren't a strong point of mine so double check with others but it looks more like magnesium to me.
I'd give it calming at rated dose.

T Ray · Mar 3, 2022

Just bless it with cal mag….

swantip · Mar 3, 2022

T Ray said:
Just bless it with cal mag….

View attachment 5095898

How much would you give it,given the current deficiency?I am giving it 1ml/L right now but I was thinking of bombarding it with 5ml/L just for once and then back to 1... Good idea or not?

jimihendrix1 · Mar 3, 2022

IMHO, not a good idea to megadose them. You can always add smaller increments if the dose youre giving them now doesnt work, but you cant take back overdosing them.

Rurumo · Mar 4, 2022

What are your temps like in there, and do you have any fans blowing directly on the plant?

Kassiopeija · Mar 4, 2022

Beware the books not slaying the plants unintentionally :lol:

McShnutz · Mar 4, 2022

Looks like Magnesium to me.
Calcium is an immobile element. It's ALWAYS taken from the oldest growth to supplement to the newest. It appears as spots.

Magnesium is mobile and is take from all over. Growers generally see it on the upper portions of their plants because it's an essential element for photosynthesis. PPFD levels are always higher more towards the top of the plant. (Closest to the light) and consequently the photosynthesis activity is highest in said leaves. This is where your deficiency is most likely to show its ugly face.

Epson Salts @ 1tablespoon/gallon of h20.
Rest easy, Magnesium sulfate will not change your pH(h20) or (KCI). Just don't over apply it as it can antagonise other elements.

Alternatively it can be foliar sprayed. Your very early into flower set and it won't affect the buds. Don't use a wetting agent.
Spray @ 1.5tsp/gallon

speedwell68 · Mar 4, 2022

McShnutz said:
Looks like Magnesium to me.
Calcium is an immobile element. It's ALWAYS taken from the oldest growth to supplement to the newest. It appears as spots.

Magnesium is mobile and is take from all over. Growers generally see it on the upper portions of their plants because it's an essential element for photosynthesis. PPFD levels are always higher more towards the top of the plant. (Closest to the light) and consequently the photosynthesis activity is highest in said leaves. This is where your deficiency is most likely to show its ugly face.

Epson Salts @ 1tablespoon/gallon of h20.
Rest easy, Magnesium sulfate will not change your pH(h20) or (KCI). Just don't over apply it as it can antagonise other elements.

Alternatively it can be foliar sprayed. Your very early into flower set and it won't affect the buds. Don't use a wetting agent.
Spray @ 1.5tsp/gallon

That was a really good post. I actually learned something. I have noticed people describing elements mobile and immobile and never really understood it.

Thanks.

fskitch · Mar 4, 2022

Rurumo said:
What are your temps like in there, and do you have any fans blowing directly on the plant?

This is an important question. Also what type of lights?

swantip · Mar 4, 2022

Rurumo said:
What are your temps like in there, and do you have any fans blowing directly on the plant?

fskitch said:
This is an important question. Also what type of lights?

24-25C(74-78F) rh:55-60% but i had humidity problems early on,before i go and buy a humidifier. 600W HPS. I also have an oscilating fan which blows on the top of the cola a bit,I dont have any more room to fit everything.This is an autoflower and its growing very vigorously its 115cm(45in) and only 40 days since sprout,so this really surprised me.

waterproof808 · Mar 4, 2022

what is the distance from your light?

swantip · Mar 4, 2022

waterproof808 said:
what is the distance from your light?

more than 18in.I had a light burn also at the top leaves but fixed that

swantip · Mar 4, 2022

So the verdict is that i should use both epsom salts and calmag at the same time?

Kassiopeija · Mar 4, 2022

McShnutz said:
Calcium is an immobile element. It's ALWAYS taken from the oldest growth to supplement to the newest.

that's wrong, Ca cannot be re-mobilised (better: retranslocated) which is the reason why a Ca-def results in stunted chlorotic shootgrowth, the necrotic spots appear somewhat later when the leaf becomes dysfunctional. And why you need a steady supply of Ca in water.
Mg is mobile and that's the reason why it's taken from the older leaves. In times of need, plants disassembles lower chlorophyll, attach the minerals to transporter-proteins, and feed these into the phloem where they can travel up or down.
But pH problems (xylem not neutral) can actually "sabotage" the ability to retranslocate nute-ions, then mobile nute defs can also appear mid or top the plant. The xylem's and phloem's pH is apart by +-1.5 - 2.0 and this creates a "pressure" to make it possible.

McShnutz said:
This is where your deficiency is most likely to show its ugly face.

only in the case of photodestruction from too high irradiance, then - and with a true Mg def, the leaves will show striped chlorosis, unlike N or S def, which will affect the complete leafcolour

Billy the Mountain · Mar 4, 2022

McShnutz said:
Looks like Magnesium to me.
Calcium is an immobile element. It's ALWAYS taken from the oldest growth to supplement to the newest. It appears as spots.
....

Calcium is immobile so it will NOT be moved from old to new growth.

HydoDan · Mar 4, 2022

Medium? PH?

waterproof808 · Mar 4, 2022

swantip said:
So the verdict is that i should use both epsom salts and calmag at the same time?

Have you looked at the manufacturers feed chart at all? You dont need the protekt or the zyme, but they want you to still use grow and calmag during flower.

Terminal calcium deficiency?

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