Oklahoma State University

Contact Info


Hailin Zhang
Nutrient Management Specialist
Dept. of Plant and Soil Sciences
Oklahoma State University
368 AG Hall
Stillwater, Oklahoma 74078

Phone: (405)-744-9566

(405) 744-0354


Manure Sampling and Testing

Manure Sampling and Testing

Pig Picture


It is strongly recommended that the nutrient content of manure is determined by laboratory analysis annually or when manure handling procedure changes. The analysis report should at least include information of dry matter percentage, soluble salts or electrical conductivity, total N, ammonium N, total phosphorus and potassium.


The key to an accurate manure analysis starts from obtaining a representative sample by using proper sampling techniques. A considerable amount of nitrogen can be lost if a sample is not correctly taken, handled, and preserved. Depending on the solid percentage, manure can be classified into solid, semi-solid, slurry and liquid categories. Each type of manure requires different sample collection and land application technique. See Sampling Animal Manure for additional information.

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