Know when to sample manure

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When should you sample manure to get the most accurate analysis? Experts at Iowa State University say that samples taken at application, or as close to it as possible, give the best results. These samples are usually well-mixed and representative of manure.

You generally won’t have results in time to make immediate adjustments in your application rate. But, you can apply the results to subsequent applications, including those involving commercial fertilizer. And the results will help create a sampling history for your manure-management plan.


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Bill Barton, DVM, is the Administrator/State Veterinarian in the Division of Animal Industries at the Idaho State Department of Agriculture.

Question: One of the areas that state regulations differ regarding trichomoniasis (trich) is the acceptance of “pooled samples” for diagnosis of the trich organism. What does “pooling” of trich samples mean?

Answer: For many years, culture of trichomoniasis samples followed by microscopic evaluation was the gold standard for diagnosing trich. As PCR, or Polymerase Chain Reaction, has become more readily available in laboratories across the country, it is rapidly replacing culture as the preferred method for diagnosing trichomoniasis.  Read More…

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