- Magruder
Check Sample Program. Each subscribing laboratory receives
one or two samples each month. Each month's samples contain the
primary plant nutrients N, P and K, and about four samples each
year contain secondary and minor nutrients, as well as contaminants
of interest. Samples are analyzed by methods chosen by the individual
participating laboratories. Their results, with designation of
method used, are reported directly to the statistician. A comprehensive
statistical report is prepared noting inter-laboratory bias,
precision and accuracy for each method and analyte, and ranking
of coded individual laboratories. These reports are sent to the
subscribers to allow them to evaluate their performance. Laboratories
are identified only by a confidential number, one being assigned
to each subscriber. Individual laboratory performance is held
in strict confidence. The Magruder Check Sample results can be
found on the internet site of Magruder (http://www.magruderchecksample.org).
- Association of American
Plant Food Control Officials. The purpose of the AAPFCO is
to provide a forum through which officials of any state, territory,
dominion, province, federal or other governmental entity on the
North American Continent, Hawaii and Puerto Rico, and employees
thereof, charged with a responsibiltiy in the enforcement of
laws regulating the production, storage, labeling, distribution,
sale or use of fertilizers may unite to (1) promote uniform and
effective legislation, definitions, rulings and enforcement practices;
(2) encourage and sponsor the adoption of the most effective
and adequate analytical methods for fertilizer by all member
agencies; (3) develop high standards of fertilizer inspection
techniques and procedures; (4) promote adequate labelling and
safe use of fertilizers; (5) provide facilities and opportunities
for the free exchange of information, discussion and cooperative
study of problems confronting members of the Association; and
(6) cooperate with members of industry in order to promote the
usefulness and effectiveness of fertilizer products and the protection
of soil and water resources.