Impact of Soil Sampling Intensity on P and K Uncertainty

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Robert Miller ALP Technical Director
Colorado State University
rmiller@lamar.colostate.edu

Dr. Robert Miller serves as the Technical Director of the Agricultural Laboratory Proficiency (ALP) Program and Coordinates four laboratory proficiency programs. He received his BS and MS degrees from the University of Nebraska, and earned his Ph.D degree at Montana State University in soils. He served ten years as an Extension Soils Specialist with the University of California Davis Cooperative Extension and Director of the Division of Agriculture and Natural Resources Diagnostic Laboratory. He joined the faculty of Colorado State University in 1997 as an affiliate Professor in Soils and Crop Sciences. He is the Technical Director for the Agricultural Laboratory (ALP) program which provides proficiency testing for soil testing labs in North America. In addition he coordinates proficiency programs for golf courses, compost and manure testing. He has authored lab analysis reference manuals and serves as the Secretary / Treasurer of the Soil and Plant Analysis Council (SPAC). He provides consultation services for the agriculture industry, laboratories and government agencies. Annually he conducts more than 25 lab visits and has published more than 40 publications Dr. Miller, has conducted research over the past 3 years on soil sampling intensity assessing lab variability and grid precision.