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.

2023 SUBSCRIPTIONS NOW ACCEPTED

DASHBOARD >>> Click on DASHBOARD for subscribing to 2023 season on our new web-based platform.
CLICK HERE FOR DASHBOARD INSTRUCTIONS
CLICK HERE FOR NEW LAB PORTAL INSTRUCTIONS

Sample schemes offered are shown below.
Regular sample scheme: 12 samples as currently sent in program ($360 plus shipping)
N sample scheme: 3 samples ($130 w/Regular scheme; $200 alone; plus shipping)
P sample scheme: 3 samples ($130 w/Regular scheme; $200 alone; plus shipping)
K sample scheme: 3 samples ($130 w/Regular scheme; $200 alone; plus shipping)

The current list of samples proposed for 2023 are shown HERE.

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.