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.

2024 SUBSCRIPTIONS NOW ACCEPTED

PURCHASE DASHBOARD >>> Click on PURCHASE DASHBOARD to subscribe for samples in 2024 season.
CLICK HERE FOR DASHBOARD INSTRUCTIONS
CLICK HERE FOR LAB PORTAL INSTRUCTIONS

Sample schemes offered are shown below.
Regular sample scheme: 12 samples ($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 2024 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.