problem with calcium RO water

[10piotr74]

hello, aeroponic system with reverse osmosis water and from the beginning I have a problem with calcium deficiency, vegetation lasted 3 weeks, flowering 3 days
I use masterblend 4-18-38, calcium 15.5-0-0 (19%) and epson salt and add monosilicon (power si) and amino acids
Co2-1400
ppfd-1000
RH- 65%
I choose masterblend 4-18-38 [2g-3g-1g/gal] please help me thank you

 

[freezeland2]

Have you added any calmag? RO water needs calmag added back in since an RO filter will remove it.

 

[10piotr74]

Have you added any calmag? RO water needs calmag added back in since an RO filter will remove it.

if i use pure calcium, should i add calmag?

 

[freezeland2]

if i use pure calcium, should i add calmag?

I’m sorry I missed that you were adding that calcium. That could be your issue. To much of that can lock your plant out.

 

[freezeland2]

I’ll let a hydro guy take it from here. Been to many years away from hydro and I don’t want to give you bad advise.

 

[mysticepipedon]

That's a magnesium deficiency, not a calcium deficiency.

 

[10piotr74]

That's a magnesium deficiency, not a calcium deficiency.

just increase the epsom salt, at the moment it gives 1g/gal then maybe try 1.6g/gal? Thx

 

[Oldguy71]

Is that calcium nitrate your adding?

 

[freezeland2]

That's a magnesium deficiency, not a calcium deficiency.

But could be caused by too much calcium and magnesium is locking out. I would ditch the calcium and epsom at next reservoir change and use a commercial calmag solution. To easy to get things out of whack in hydro when mixing your own brew.

 

[10piotr74]

Is that calcium nitrate your adding?

Yes 15.5-0-0 3g/gal

 

[Oldguy71]

I’m kinda thinking light burn. Have you tried raising your light? I think I’d stop the silica for now, it can lock out other nutrients.

 

[Imzzaudae]

I'm also leaning towards light burn. Dark green with burnt tips makes me think over feeding as well. Not bad but it needs to be corrected.

 

[Aqua Man]

I dont see a calcium deficiency either.

Whats the temperature?

can you show some pics of how you have your equipment arranged?

i would lower humidity to about 55% with those numbers of co2.

looks like a transpiration issue and i agree back the lights up a bit

 

[hypertyper]

Isn't 2.5 EC quite a lot? I've made the mistake of trying to figure out what my deficiency was when really it was toxicity...