Happy day! Test results are in.
This is 5 parts blonde Latvian peat + 1 part 2 year old leaf mold + 5g 34% Ca Maerl/l of moist soil
Excel sheet: https://bit.ly/2GuREtD
- First calculation is based on the Mg value of the sample:
Ca = 8* Mg
K = 0.5 * Mg = P = S
- Second calculation is based on the wanted base saturation's and uses the TCEC calculation.
I've used this formula for TCEC:
TCEC = Ca/200+K/390+Mg/120+Na/230 + 12(7-buffer pH)
If you have suggestions for changing my calculation methods I would love to hear it
What I see is a big difference in needed Ca input between the two calculations. I think I'd opt for the first one.
My interpretation: If I look at the soil test I see manageable numbers.
- I definitely need more P and S.
- More Mn aswell to get that Fe/Mn balance better.
- I also will need more K: a little from the start and build up during veg.
I will add 1 part pumice instead of perlite.
The CEC on my analysis says 32, my calculations says 67. This is something I don't get since I'm using the formula of their website.
A CEC of 67 would be way too big, I'm clueless on how to think about that part.
Edit: spectrum works with lbs, I did with meq. 1ppm=2lbs so 67/2=+-32?