What’s everyone using for cal-mag supplements that don’t contain nitrogen?

[Stomate]

Title says it all haha
I’m running an rdwc with Floraflex and RO water. I’ve been using bontanicare cal/mag (2-0-0) and always run into dark leaves in flower, assuming from an excess of nitrogen. So I’m in the market for something else to supplement in that doesn’t contain nitrogen

 

[shnkrmn]

Title says it all haha
I’m running an rdwc with Floraflex and RO water. I’ve been using bontanicare cal/mag (2-0-0) and always run into dark leaves in flower, assuming from an excess of nitrogen. So I’m in the market for something else to supplement in that doesn’t contain nitrogen

Someone else here is running the same regimen and they ran into deficiencies without cal/mag just recently. They're in a drain to waste system not rdwc. I use GH Calimagic which is 1-0-0. Maybe that would be a sufficient reduction in N?

 

[Billy the Mountain]

Title says it all haha
I’m running an rdwc with Floraflex and RO water. I’ve been using bontanicare cal/mag (2-0-0) and always run into dark leaves in flower, assuming from an excess of nitrogen. So I’m in the market for something else to supplement in that doesn’t contain nitrogen

It's doubtful that the minor contribution of N from the CalMag is the primary cause of excess Nitrogen.
A ml/G of the Botanicare CalMg provides ~ 5 ppm Nitrogen.
You could half that by using GH CalMg as mentioned above.
The overwhelming majority of N will come from the base nutrients.

 

[Stomate]

It's doubtful that the minor contribution of N from the CalMag is the primary cause of excess Nitrogen.
A ml/G of the Botanicare CalMg provides ~ 5 ppm Nitrogen.
You could half that by using GH CalMg as mentioned above.
The overwhelming majority of N will come from the base nutrients.

Yeah I was admittedly over feeding for a bit and burned up some leaves but I’d still like to cut out a bit of the nitrogen. I suppose I’ll give GH’s formula a try. Thanks

 

[Billy the Mountain]

Yeah I was admittedly over feeding for a bit and burned up some leaves but I’d still like to cut out a bit of the nitrogen. I suppose I’ll give GH’s formula a try. Thanks

Swapping the CalMg brands will help a bit, but reducing the base nutrient source of Nitrogen is a better alternative if your objective is to reduce the Nitrogen concentration in your nute mix.

 

[plumsmooth]

BIlly has a good point. The only thing I would add is if you really want to try adding Cal without N you can use some Calcium Sulfate which is soluable 'enough' to work with. You can read this article.

Using calcium sulfate in hydroponics – Science in Hydroponics

scienceinhydroponics.com

 

[plumsmooth]

Another thing you could try is the Masterblend Cannabis formula which I believe is primarily designed for finishing up with less N at the end i.e. a good fade and less chorophyl...

MasterBlend 0-12-24 Cannabis Bloom Formula 1 lb.

customhydronutrients.com

 

[Lou66]

All "CalMag" type fertilizers contain calcium nitrate, magnesium nitrate and some chelated iron.
If it doesn't contain nitrogen it is not 'CalMag'.

The sulfates of calcium and magnesium can be used but gypsum takes it's time to dissolve. You need agitation.