Magruder Fertilizer Proficiency Testing Program

The Magruder program is a proficiency testing program for fertilizers. Each subscribing laboratory receives one or two samples each month. The samples contain varying levels of plant nutrients as well as trace metal contaminants.

2025 SUBSCRIPTIONS NOW ACCEPTED

PURCHASE DASHBOARD >>>> to subscribe for samples for 2025 season.

DASHBOARD INSTRUCTIONS

LAB PORTAL INSTRUCTIONS

Sample schemes are as follows:

  • Regular Sample Scheme: 12 samples ($360 plus shipping)
  • N Sample Scheme: 3 samples ($130 w/Regular Sample Scheme; $200 alone; plus shipping)
  • P Sample Scheme: 3 samples ($130 w/Regular Sample Scheme; $200 alone; plus shipping)
  • K Sample Scheme: 3 samples ($130 w/Regular Sample Scheme; $200 alone; plus shipping)

View the Current List of Samples for 2025

Samples are sent according to the scheduled date after payment is made. Lab must enroll in all the samples for a particular sample scheme. All samples in a previous round will be sent with payment made during the subscription year.