What do you think about this fertilizer?

I saw it on sale locally for $25 for 20 lbs, is it any good?
If it's missing anything, how difficult will it be to complement it?
I can't find calcium mentioned anywhere, does it mean it's missing?

Here's the breakdown:

NPK: 13 - 7 - 20
Mg, S: 1 - 5

N:
Ammonium (NH4) 5.9%
Nitrate(NO3) 7.1%

P:
water soluble 7%

K:
water soluble 20%

Mg:
1.2%

S:
4.6%

B:
water soluble 0.02%

Cu:
EDTA chelated 0.01%

Fe:
EDTA chelated 0.1%

Mn:
EDTA chelated 0.1%

Mo:
water soluble 0.002%

Zn:
EDTA chelated 0.01%

I have confirmed that it does indeed lack Calcium.
What is the simplest and cheapest way to supplement it?

Thank you for your help!

DaveInCave said:

I have confirmed that it does indeed lack Calcium.
What is the simplest and cheapest way to supplement it?

Thank you for your help!

Click to expand...

ZenHydro has GH Calcium quaty $11.67

If it doesn't have calcium, it's probably meant for soil, which should have lime in it. What would give this away is whether it uses urea or nitrate salts for N, and lacking calcium (lacking the nitrate salt calcium nitrate).

If I happen to have a bunch of left over drywall pieces from a renovation, would pulverizing them and adding them to my soil do anything to offset the lack of calcium?

If so, how much would you add?

Do not use drywall as a source of gypsum. You can buy a 10lb box of agricultural gypsum for cheap or better yet get some dolomitic lime for cheap too.

Drywall gypsum is chock full of heavy metals and other toxic contaminants as it's not made to grow things so purity is not required.

Gypsum adds calcium and sulfur where dolomitic lime adds calcium and magnesium. I'd get the lime and use some epsom salts if you want extra sulfur.

OldMedUser said:

Do not use drywall as a source of gypsum. You can buy a 10lb box of agricultural gypsum for cheap or better yet get some dolomitic lime for cheap too.

Drywall gypsum is chock full of heavy metals and other toxic contaminants as it's not made to grow things so purity is not required.

Gypsum adds calcium and sulfur where dolomitic lime adds calcium and magnesium. I'd get the lime and use some epsom salts if you want extra sulfur.

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Thanks for the info! I was only asking about the drywall because I already have a lot of left over pieces.
How much gypsum per soil should I add?

DaveInCave said:

Thanks for the info! I was only asking about the drywall because I already have a lot of left over pieces.
How much gypsum per soil should I add?

Click to expand...

a few years ago there was a big hub bub about drywall from China and how much shit was in it. a lot of people had to rip it all out and start over.

rkymtnman said:

a few years ago there was a big hub bub about drywall from China and how much shit was in it. a lot of people had to rip it all out and start over.

Click to expand...

For better or worse, I live at the moment in one of the most environmentally strict countries in the world, I can be quite sure nothing sold here has any of that shit in it.
I knew someone who built a house and thought they are saving $4000 buying Chinese drywalls, guess again...
Had to redo the whole thing.

Figuring out how much insoluble calcium your soil needs, or already has in it, is voodoo and it's why I love hydro. (so much easier).

Your soil could already have enough calcium in it.... or you need more calcium... who knows.