Amber Moore, Ph.D. University of Idaho

Collected to represent Conservation Management Unit Time allowed between sampling and planting (Code 590) Within 3 months for NO3-N and NH4-N Within 9 months for P, pH, OM, free lime, and EC

Field size (acres) Minimum number of subsamples for one composite sample Fewer than to to to 5025 More than 5030

For all parameters One foot depth Greatest abundance of plant roots Largest concentration of nutrients For mobile nutrients (Nitrogen, Sulfur, and Boron) One foot increments to rooting depth

Double/triple check results at multiple labs, both government and private Stay in your region Soil test methods change depending on general soil characteristics Example – Soil test P Mehlich III method for acid soils, Olsen method for alkaline soils Calcareous soils in our region Utilize labs in Idaho, Nevada, Utah, Montana, Wyoming, Eastern Washington, Eastern Oregon

Manure testing is crucial – variability too great Test before every growing season

Must be NAPT-MAP or NAPT-CAP approved Stuckenholtz laboratory – Twin Falls, ID USU Analytical Lab. – Logan UT

Manure and Wastewater Sampling Sheffield and Norell Lagoon, compost, stockpile sampling S/CIS1139.pdf