How Calculate overal npk of an organic mix

[Limolax]

When we have a slow releasing source of organic NPK like green sand, rock phosphate ,etc lets say the number shows 0-33-0 comparing to a fast acting source like blood meal,kelp meal,etc.lets say the number shows 1-1-2 how can I calculate the npk in my soil? What portion of the slow acting organic is gonna be available for the plant to use ?
Idk if my question was completely clear. I just wana calculate the npk of my soil but I just don't understand how to calculate it npk amount for slow releasing organics. Anyone can clear that for me please?
I just wana be able to calculate some rough estimates.
Thank you

 

[Easy7]

The slow release is going to be broken down mostly via bacteria. I wouldn't worry that much about that. You could do a volume calculation using so many cups of peat, with so many cups of fert or what ever is in the mix. Yet your final calculation should be much lower than what the guano says it is....should be highly diluted. I have no idea what is a strong soil in Npk ratio looks like. It could be partly numbers from going on cheap Walmart soil that has a npk. Best to start weak and feed tea's. Super soil recipes are usually for a lot of plants.

 

[vapor]

http://soilminerals.com/Ideal_Soil_Main_Page.htm

if you look close there is a spread sheet....

 

[Limolax]

Anyone!?!?