John Breker is a soil scientist with AGVISE Laboratories. He provides information on soil fertility and plant nutrition to agronomists and growers in the Midwest, Northern Plains, and Canadian Prairies. John was raised on his family’s grain farm in southeastern North Dakota and has studied soils as an amateur or professional since 2007. He received B.S. and M.S. degrees in soil science from North Dakota State University in 2015 and 2017, respectively. With his M.S. advisor Dr. David Franzen, John studied several soil potassium testing methods, corn yield response to potassium fertilization, and the effect of sampling time on soil potassium levels.