Calcium issues with autos and calmag

MIMedGrower · Dec 12, 2020

Your water is very hard. Read about alkalinity and water and gardening.

Also changes take at least a week and you wont see old damage repair much if at all. Have to look to new growth for improvement.

And flushing will stall things a while. Best tip is to always err on the side of underfeeding. You can always add more if needed. But removing too much doesnt work so well. Damage is done by then.

Dramadon3151 · Dec 12, 2020

Wolters_88 said:
Ok, so this is my third grow and once again I’m having the same issue. I can’t seem to not get a calcium deficiency. I put in 5ml of calmag per gallon with every single feed. The plants look great but it’s still happening. Attached are my girls just going into flower. Is there anything else I can add to help this issue?

Try adding a silica to your lineup too. It helps with everything overall.

Aqua Man · Dec 12, 2020

Tip from experience.

When you decide on a course of correction stick to it and wait to see results... this can take up to a week depending on the situation.

If you keep chasing your tail and doing more things.... your likely to make it worse... while we need instant gratification plants do not and will not give you that.

Patience

Dramadon3151 · Dec 12, 2020

Aqua Man said:
Tip from experience.

When you decide on a course of correction stick to it and wait to see results... this can take up to a week depending on the situation.

If you keep chasing your tail and doing more things.... your likely to make it worse... while we need instant gratification plants do not and will not give you that.

Patience

Excellent advice

Wolters_88 · Dec 12, 2020

Aqua Man said:
Tip from experience.

When you decide on a course of correction stick to it and wait to see results... this can take up to a week depending on the situation.

If you keep chasing your tail and doing more things.... your likely to make it worse... while we need instant gratification plants do not and will not give you that.

Patience

Ok, so just keep flushing it?

Wolters_88 · Dec 12, 2020

Dramadon3151 said:
Try adding a silica to your lineup too. It helps with everything overall.

I literally just got the GH Armor Si from Amazon 15 seconds ago in the mail.

Dramadon3151 · Dec 12, 2020

Wolters_88 said:
I literally just got the GH Armor Si from Amazon 15 seconds ago in the mail.

Gh is a good product imo. Ppl have wom canabis world cups growing w it amd barring like 2 brands i know of all the silica is the same basically. Gh armor si is as good as any.

Dramadon3151 · Dec 12, 2020

Dramadon3151 said:
Gh is a good product imo. Ppl have wom canabis world cups growing w it amd barring like 2 brands i know of all the silica is the same basically. Gh armor si is as good as any.

Silica is one of those things that is so beneficial that you wonder why everyone doesnt use it. Autos can be so sensitive compared to photos, anything that helps u to not be as effected by fluctuations is good imo

Dramadon3151 · Dec 12, 2020

Wolters_88 said:
I literally just got the GH Armor Si from Amazon 15 seconds ago in the mail.

Is your grow climate controlled? Indoors? Just asking because years ago i grew in a shed and the cool, humid nights caused this same exact rust formation on my leaves. Adding fans, dehumidifying and keeping my twmps within 15° from lights on to lights off, stopped it. If its cap mag deficient. Flushing is gonna be a slow road. When youre done try switching to botanicare sweet. Mag sulphur.

Wolters_88 · Dec 13, 2020

Aqua Man said:
Tip from experience.

When you decide on a course of correction stick to it and wait to see results... this can take up to a week depending on the situation.

If you keep chasing your tail and doing more things.... your likely to make it worse... while we need instant gratification plants do not and will not give you that.

Patience

Do I keep flushing this for a week?

Dramadon3151 · Dec 13, 2020

Wolters_88 said:
Do I keep flushing this for a week?

That seems exsessive to me but ive never had to do this. I know one thing. When u start back feeding nutes...take it slow. Dont jump right into full strength. . maybe 50%

Aqua Man · Dec 13, 2020

Wolters_88 said:
Do I keep flushing this for a week?

Typically when resetting the media flush with something like recharge 3x the volume of the pot (once) then give a light feed of balanced nutrients equal to 1x the volume of the pot right after.

Then continue as normal but giving a good dry cycle if this is soil.

The plant may look over watered and root temps will play a role in how fast she gets over that but then pay attention to new growth as was stated before.

Aqua Man · Dec 13, 2020

But you also need to figure out why you had the issue to begin with.

What the ppm of source water?

Nutrients and any additives used including ph up or down?

How do you mix them?

Media and pot size?

Temps and humidity day and night?

Wolters_88 · Dec 13, 2020

Aqua Man said:
But you also need to figure out why you had the issue to begin with.

What the ppm of source water?

Nutrients and any additives used including ph up or down?

How do you mix them?

Media and pot size?

Temps and humidity day and night?

That seems to be why people are saying I have an issue. My source water is like 279ppm. I have the lights on 20/4. The temps are humidity are always in the VPD chart.

Aqua Man · Dec 13, 2020

Wolters_88 said:
That seems to be why people are saying I have an issue. My source water is like 279ppm. I have the lights on 20/4. The temps are humidity are always in the VPD chart.

What VPD chart? Because there is not one VPD chart and should not use the pregenerated ones. Read this and pay close attention to how leaf temps need to be taken into account.. I am almost certain your humidity will be to high.

VPD (vapor pressure deficit)

Ok i was gonna sit down and write out a whole article but i have been lazy so instead instead I'm going to copy paste because im lazy. This is not my work so let start. You may find this very long but its worth the read. Some may want to skip ahead. I have added here and there to what i feel is...

www.thcfarmer.com

Do you have access to RO?

Wolters_88 · Dec 13, 2020

This is the chart I use. I have a home RO system for my drinking water with culligan.

Aqua Man · Dec 13, 2020

Wolters_88 said:
This is the chart I use. I have a home RO system for my drinking water with culligan.

Notice the top left of the chart says 1f difference? Thats the leafs temp in relation to the room temp. If under LED its likely 5-8f cooler than room temps... which make a huge difference. Eg.

77f room
76f leaf as that chart says
RH 60%

Gives a KPA of 1.16 good for late veg of early flower.

Now if LED and a guess of 6f difference.

77f room
71f leaf
60% RH

Gives a KPA of 0.69 far to humid for flower or even late veg. More suited to seedlings and clones

Aqua Man · Dec 13, 2020

What lights are you using?

Mix the RO 50/50 with tap and your good for source water

Wolters_88 · Dec 13, 2020

I’m like two weeks into flower and my temp is averaging 75 and my RH is 55. I have a HLG 600H in both my 5x5 and 4x4.

Aqua Man · Dec 13, 2020

If you can find or buy an IR temp gun you can calculate to a tee. They are cheap. If not I suggest using around 5f diff for leaf temps.

Hope you read that thread I linked because I'm going to assume you understand it. VPD is only needed for lights on and if possible night humidity should be lower. 10-15% is ideal but not absolutely needed

Use this calculator. It has the VPD for stages of growth listed right in it.

VPD Calculator - Vapor Pressur - Apps on Google Play

Simple calculator to generate VPD based on Air/Surface Temps and Humidity.

play.google.com

Calcium issues with autos and calmag

Calcium issues with autos and calmag

MIMedGrower

Dramadon3151

Aqua Man

Dramadon3151

Wolters_88

Wolters_88

Dramadon3151

Dramadon3151

Dramadon3151

Wolters_88

Dramadon3151

Aqua Man

Aqua Man

Wolters_88

Aqua Man

VPD (vapor pressure deficit)

Wolters_88

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Aqua Man

Aqua Man

Wolters_88

Aqua Man

VPD Calculator - Vapor Pressur - Apps on Google Play

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