When an organic fertilizer is applied to the soil it is a
food source for the microbes. Initially there is very little in a pure organic
fertilizer that can be directly used by the plants. The energy source for these
microbes is carbon and carbon is contained in amino acids. The microbes consume
this energy and use it to build their populations to higher levels. They have
life cycles of about twenty minutes, so they are constantly dying off and
releasing nutrients in the forms that can be used by plants. It is obvious then
that the fertilizer that contains the highest level of amino acids is the one
that will ultimately provide the most nutrition for the plant.
What you are really purchasing when buying an organic
fertilizer is a pile of amino acids, not an NPK source. When you purchases a
product that has a high percentage of amino acids, you are getting a bigger
pile of amino acids for your money. If you purchases a ton of a typical manure
based product that contains between 5% and 10% amino acids, you will getting
between 100 and 200 pounds of amino acids for your money. If, on the other
hand, you purchase a ton of Nature Safe 10-2-8, which contains 60.28% amino
acids, you will be getting over 1,200 pounds of amino acids for your money.
When viewed in those terms, it is relatively easy to see
where you are getting the biggest bang for your buck.
The traditional way of comparing fertilizers is to look at
the cost per pound of nitrogen that is being applied. A better comparison would
be the number of pounds of amino acids that are being applied for every pound
of nitrogen. That is usually calculated on the basis of pounds per thousand
square feet. The following chart shows the number of pounds of amino acids that
are being applied per 1,000 square feet when each fertilizer is applied at the
rate of 1 pound of nitrogen per 1,000 square feet.

The amount of amino acids that are being provided is only
part of the story. The other important consideration is the availability or the
digestibility of the amino acids provided. The amino acids in Nature Safe are
pet food grade amino acids that are all produced in our own plants. This allows
Nature Safe to carefully control the way its proteins are produced to insure
consistency and that they are very digestible by soil microbes. Other companies
do not produce their own ingredients, so they do not have the kind of control
that guarantees both digestibility and consistency.