A little advise would be appreciated

C

Clump354

Member

• Jul 12, 2020

• #1

Hello everyone...looks to me to be a cal mag deficiency but I'm a new grower so I wanted a OG's opinion. Im growing in soil its my 2ed month in veg..nutes are ff trio and I just started cal mag plus last week due to these spots on my leaves.. Soil ph is a little above 7 (one of those 10$ meters for light..moistened of soil and ph) so not really sure whats wrong. Also the spots are on upper newer growth..found 3 leaves like this

 

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JCGreen81

Well-Known Member

• Jul 12, 2020

• #2

I’m not an OG but cal mag issue pretty rare unless you’re using RO water

what type of water are you using?

do you have picture of the entire plant and the other leaves around this particular one ?

 

C

Clump354

Member

• Jul 12, 2020

• #3

JCGreen81 said:

I’m not an OG but cal mag issue pretty rare unless you’re using RO water

what type of water are you using?

do you have picture of the entire plant and the other leaves around this particular one ?

Click to expand...

I'm using flitered water..ppm 100ish..I cut that leave during trimming...pics coming soon

 

C

Clump354

Member

• Jul 12, 2020

• #4

Here they go

 

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C

Clump354

Member

• Jul 12, 2020

• #5

Also do u think indirect sunlight could have done this...i had to take her out the tent and i put it in another room with little sunlight coming through

 

Wattzzup

Well-Known Member

• Jul 12, 2020

• #6

Why do people use RO water in soil? Then post cal mag issues? Switch to tap water and ph to 6.5

 

Shape Shifter

Well-Known Member

• Jul 12, 2020

• #7

phosphorus excess

https://i.redd.it/qhrj8qmjl7az.jpg

 

Shape Shifter

Well-Known Member

• Jul 12, 2020

• #8

Wattzzup said:

Why do people use RO water in soil? Then post cal mag issues? Switch to tap water and ph to 6.5

Click to expand...

Hes not using RO water. Its 100ppm.

 

C

Clump354

Member

• Jul 12, 2020

• #9

Shape Shifter said:

Hes not using RO water. Its 100ppm.

Click to expand...

I'm use tap with Pur filter

 

Shape Shifter

Well-Known Member

• Jul 12, 2020

• #10

Clump354 said:

I'm use tap with Pur filter

Click to expand...

That's fine. It's not RO. It doesn't filter minerals.

 

C

Clump354

Member

• Jul 12, 2020

• #11

Cool..so does anyone second the phosphorus idea??

 

Shape Shifter

Well-Known Member

• Jul 12, 2020

• #12

The problem is starting from the top. That narrows it down quite a bit.

 

C

Clump354

Member

• Jul 12, 2020

• #13

Shape Shifter said:

The problem is starting from the top. That narrows it down quite a bit.
[/

Shape Shifter said:

The problem is starting from the top. That narrows it down quite a bit.

Click to expand...

Thanks Shape Shifter

Click to expand...

 

Kalebaiden

Well-Known Member

• Jul 12, 2020

• #14

It's a Cal/Mg issue.

Fix that and you're golden.

 

Shape Shifter

Well-Known Member

• Jul 12, 2020

• #15

 

Kalebaiden

Well-Known Member

• Jul 12, 2020

• #16

Phosphorus issues start at the bottom of the plant.

His issue is at the top, which indicates it's a Cal/Mg issue.

 

Budzbuddha

Well-Known Member

• Jul 12, 2020

• #17

Clump354 said:

Cool..so does anyone second the phosphorus idea??

Click to expand...

NO ....

You at the upper limits of ph at 7.0 for soil.
There is no reason to rely on cheap soil meters when all you have to do is keep a stable ph of whats going in. Meaning control the ph of your water and or mix to “ better “ match the range needed for soil ..... 6.5.

Those leaf issues are signs of a PH issue or swing.
Cannabis does NOT need special water ...

 

Shape Shifter

Well-Known Member

• Jul 12, 2020

• #18

Budzbuddha said:

You at the upper limits of ph at 7.0 for soil.

Click to expand...

Not a reliable reading.

 

Budzbuddha

Well-Known Member

• Jul 12, 2020

• #19

If you use RO or distilled water, the chances are high that your plants are getting next to no Cal-Mag. The same also applies to situations where you are using growing media like coco coir.

 

Kalebaiden

Well-Known Member

• Jul 12, 2020

• #20

Clump354 said:

Soil ph is a little above 7

Click to expand...

Good catch, I missed that part.

It still looks like a Cal/Mg issue but the pH needs to be fixed.

A easy fix is dolomitic lime as a top dressing. It stabilizes soil and gives Cal/Mg as well.