NEW PROGRAM INFO:
Introduction
Method Codes
Data Entry Instructions
Training Videos
Statistical Reports
FAQs on DLs
Contacts

All Labs Proficiency Reports

JAN 2015
2015-01
DAP, old report
analyte report
method report
FEB 2015
2015-02-A,
KCl, old report
analyte report
method report
FEB 2015
2015-02-B
Zn, old report
analyte report
method report
MAR 2015
150311
6-9-22
analyte report
method report
APR 2015
150411
UAN
analyte report
method report
APR 2015
150412
SPM
analyte report
method report
MAY 2015
150511
32-0-4
analyte report
method report
JUN 2015
150611
micros
analyte report
method report

2014 Samples and Reports

2014-07
MAP
report
2014-08
5-8-21
report
2014-09
20-0-5
report
2014-10
biosolid
report
2014-11
3-9-18
report
2014-12
9-3-4
report
2014-01
13-13-13
report
2014 -02
DAP KCl
report
2014-03
8-8-8
report
2014 -04
GTSP, Zn
report
2014-05
12-13-14
report
2014-06
5-2-0
report

Click on the Sample Number when underlined to open the MSDS (pdf).
Click on the Sample Description when underlined to view guarantees (pdf).
Click on report, analyte report, or method report when underlined to open proficiency reports (pdf).

Previous Proficiency Reports

FREE Membership to the Magruder Check Sample Program

November 2014 Newsletter
April 2014 Newsletter
October 2013 Newsletter
June 2013 Newsletter
Sept 2012 Newsletter

  • Request a Reserve Check Sample, A Certified Homogeneous Sample is Available - 2009-11

  • Magruder Sample Schedule and Committee Minutes

  • Magruder Payment Invoice (pdf)

  • Magruder Payment Invoice (doc)

  • Magruder By-Laws

  • Magruder Brochure (pdf)

  • Magruder Brochure (doc)

  • Magruder Membership Application in Word Format

  • Magruder Membership Application in Adobe PDF Format

  • Instructions for Supplying Product to Magruder

  • Magruder Committee Roster

  • SUIP 25 Heavy Metals Calculator

  • General Instructions Shipped with Samples (pdf)

  • Documents for Magruder Program prior to March 2015

  • Magruder Report Form (xls)

  • Magruder Report Form (pdf)

  • Magruder Report Form (Fillable pdf)

  • Magruder General Instructions (pdf)

  • Magruder Method Codes (doc)

  • Magruder Method Codes (pdf)

  • Magruder Check Sample Statistics



  • Download the Adobe Acrobat PDF Reader (FREE!)

    History

    Round robin samples are frequently used to provide comparisons of analytical results. The first such program to make use of comprehensive statistical techniques is the Magruder Fertilizer Check Sample Program. The program bears the name of its originator, Dr. E. W. Magruder. Dr. Magruder was a chemist with the F.S. Royster Guano Company. He distributed the first sample to 29 laboratories in November, 1922. The Royster Guano Company and its successors continued to totally support this program for 36 years, first under the direction of Dr. Magruder and later under the direction of Dr. S. F. Thornton.

    In 1958 the sponsorship of the program transferred from Royster to the joint co-sponsorship of the Association of American Plant Food Control Officials (AAPFCO) and The Fertilizer Institute (TFI). TFI asked AAPFCO to assume administration of the program in 1971. It continues to function under this arrangement today. In addition, W. R. Grace & Company agreed to subsidize the program by furnishing statistical evaluations of the data through its statistician, Edwin Glocker. This continued until the death of Ed Glocker in 1989. The statistical evaluations continue via an independent statistical consultant engaged by the Magruder Committee.

    Administration

    The Magruder Program is administered by a committee appointed by the President of AAPFCO. Membership is balanced between control officials and industry representatives, with six members from each sector. This is the only AAPFCO committee which permits industry representatives to hold full committee privileges, including holding committee offices and voting. The committee sets subscription fees, selects the samples comprising the series, contracts with a commercial laboratory to prepare and distribute samples, retains a consultant statistician, and authorizes educational programs.

    Current Programs

    Each subscribing laboratory receives one or two, (5 to 6 ounce, 142 to 170 gram) 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.

    Interorganizational Cooperation

    The Magruder Program objectives and goals are those of AAPFCO , AOAC International, and TFI. In turn, each of these organizations strongly supports the Magruder Program. The methods designated on reports are those of AOAC International. TFI supports the program by printing and mailing the monthly statistical reports.

    Participants

    There are around 100 laboratories subscribing to the Magruder Program. Most of the state laboratories in the United States are participants. The remaining number are about equally divided between commercial and industrial laboratories on all continents except Antarctica.

    Quality Assurance

    Interlaboratory evaluation of methods of analysis and personnel performance is increasingly important in the modern laboratory.

    Instrumentation in laboratories is a great time saver, but needs careful control. Both precision and accuracy should constantly be monitored by every laboratory. These areas can be improved by an Interlaboratory statistical evaluation of your laboratory. The Magruder Program offers this service to all organizations involved in fertilizer analysis.

    Magruder Check Sample Committee

    Appointments through 2015

    Ametra Berry
    Georgia Dept of Ag
    Kerry Cooner
    Agrium U. S. Inc.
    Michael Hojjatie
    Tessenderlo Kerley
    Patricia Lucas, Sec.
    Florida Dept of Ag
    Terrence Field
    Canadian Food
    Teresa Grant
    NC Dept of Ag.
    Hugh Rodrigues
    Thornton Labs
    Brian White
    CF Industries

    Appointments through 2016

    Gregory Haberkost
    Lebanon Seaboard
    Bill Hall, Chairman
    Mosaic
    Keith Wegner, Vice Chair
    CO Dept of Ag
    Sharon Webb
    University of Kentucky

    Appointments through 2017

    Rhonda Boles
    University of Missouri
    Harold Falls
    CF Industries
    Barbara James
    PCS Phosphate
    James Bartos
    Office of IN State

    Magruder Contacts

  • Andy Crawford, Statistician
  • Jamey Johnson, Treasurer
  • Robert Kieffer, Able Laboratory, Sample Preparation
  • Frank Sikora, Web Site Administrator

  • Other Links:

    The Association of American Plant Food Control Officials AAPFCO

    The Association of Fertilizer and Phosphate Chemists AFPC

    The Fertilizer Institute TFI

    AOAC, Intl.


    last updated March 28, 2015