Sorry, you're wrong. 5-10-5 has 5 times as much available N, P, and K as
1-2-1. The values are percents of the total weight.

They can be simply worked out using the chemical formulas for the
ingredients and a table of atomic weights.

"George.com" wrote in message
...

"Carl 1 Lucky Texan" wrote in message
. com...
wrote:

Remember though that these numbers are ratios. The actual quantities
of
nutrients could be higher or lower. A soil test is the best place to
start. Say, for instance the 5-10-5 could also say 1-2-1, and still be
the the same ratio, but the quantity would be higher for each of
5-10-5.


Are there any recommended sites selling soil tests? I've never tested
mine but confess the idea intriques me.

Carl

Carl. There are the simple take home tests for ph levels, N P and K. There
are the more sophisticated soil tests run by specialised labs that require
you to submit soil and give you a wide range of tests they can run.

rob