How Much Is Too Much CalMag?

[Kilbarrog]

This is day 48 since 2nd set of leaves.
They're getting 3ml of Biobizz Grow, 2ml Acti Vera, 3ml Alga Mic, 3ml Bloom, 1ml Top Max, 2ml of Bud Candy, 2ml Nirvana & they've recently gotten 2 doses of Bloombastic PK booster at 0.3ml then 0.5ml per litre of water
I'm using RO water for the first time & I'm sure this is magnesium deficiency?
I've given her two doses of Biobizz CalMag at 0.3ml a litre, then 1ml a litre.
As you can see it didn't seem to help
Since Biobizz CalMag has no nitrogen in it, how much can I give her/them, per litre of water?

Thanks for your help as always

 

[DOA]

This is day 48 since 2nd set of leaves.
They're getting 3ml of Biobizz Grow, 2ml Acti Vera, 3ml Alga Mic, 3ml Bloom, 1ml Top Max, 2ml of Bud Candy, 2ml Nirvana & they've recently gotten 2 doses of Bloombastic PK booster at 0.3ml then 0.5ml per litre of water
I'm using RO water for the first time & I'm sure this is magnesium deficiency?
I've given her two doses of Biobizz CalMag at 0.3ml a litre, then 1ml a litre.
As you can see it didn't seem to help
Since Biobizz CalMag has no nitrogen in it, how much can I give her/them, per litre of water?

Thanks for your help as always
View attachment 1633478View attachment 1633479

Do you happen to know what that nutrient cocktails EC value is?

 

[Kilbarrog]

No, I think I read that you don't measure organic nutrients EC. But I could be wrong

 

[BII]

When did you do the cal-mag feeds? Enough time pass yet to expect to see results?

The more intense yellowing of lower vs. top leaves to me suggests low N could be the or an additional problem. And it looks more like Mg vs. Ca or both Ca-Mg deficiency (or block out), with no Ca deficiency-related brown spots. You may want to use just a Ca or Mg salt (epsom salt) to try to fix vs. feeding both.

If it's decided you should dose the plant with Ca and/or Mg, consider doing it by foliar feeding - faster and does not affect, add salts to, the medium/soil.

 

[Kilbarrog]

Here's my last few feeds
Biobizz recommends 0.8ml per litre of calmag to correct deficiency
I was thinking nitrogen, but from reading, magnesium starts from the bottom & works it way up

Date​

Litres of Water ​

Root Juice ml​

Grow ml​

Fish Mix ml​

Acti Vera ml​

Alga Mic ml​

Bloom ml​

Top Max ml​

Cal-mag ml​

Bud Candy ml​

Nirvana​

Bloombastic​

12th​

11​

-​

33​

-​

22​

22​

22​

11​

3ml + 0.5ml extra for plant with deficiency​

22​

22​

0.3​

​

​

​

​

​

​

​

​

​

​

​

​

​

17th​

10​

-​

30​

-​

30​

40​

30​

10​

5ml​

20​

20​

3ml​

 

[elcoloan]

Might not be a deficiency issue per se but a watering one. How do you water (fast, slow, sprinkle, pour, etc)? How much and how often do you water? How big are the pot? are they plastic or fabric pots?

 

[Kilbarrog]

Every 4 (sometimes 5) days
6.5l plastic pots
2 litres each plant
First litre poured slow to soak the soil. then I wait for run off as I'm also using Advanced Nutrients, then add the next litre & do the same

 

[Kilbarrog]

4 out of 5 girls are having the same problem.

I'm starting to think it's not a magnesium issue
They were only fed lastnight & look at them today.
The other 3 have gotten way worse overnight
What's more confusing, is the runt of the grow (that I was going to throw out in veg!!) is doing just fine.
They are all getting the exact same feed from the same 10litre bucket
What the actual f**k is going on?????

 

[Kilbarrog]

I said I'd post this separately
This is the smallest weakest girl in the tent

She is getting the exact same feed, at the same rate - 2 litres of water every 4 days
She looks perfect to me?!?

I just don't get it

 

[JP1]

This looks like N lockout to me. I'm not familiar with those nutes but looks like a lot. Are you giving plain water between feedings?