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Manure sampling for nutrient analysis: variability and sampling efficacy.

Z Dou1, D T Galligan, R D Allshouse

  • 1Center for Animal Health and Productivity, School of Veterinary Medicine, Univ of Pennsylvania, New Bolton Center, 19348, USA. dou@cahp2.nbc.upenn.edu

Journal of Environmental Quality
|July 31, 2001
PubMed
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Accurate animal manure nutrient analysis requires careful sampling. Agitated manure needs fewer samples (3-5) for reliable results than unagitated manure (40+), improving nutrient management and water protection.

Area of Science:

  • Agricultural Science
  • Environmental Science
  • Soil Science

Background:

  • Effective animal manure management is crucial for water quality protection and sustainable crop production.
  • Accurate nutrient concentration data is essential for optimizing manure application and minimizing environmental risks.

Purpose of the Study:

  • To investigate sample variability and determine the number of samples required for reliable nutrient analysis in different animal manure types and handling systems.
  • To compare nutrient content estimations using on-farm measurements versus standard book values.

Main Methods:

  • Serial manure samples were collected from dairy, swine, and broiler poultry operations during field application loading.
  • Samples were analyzed for total solids (TS), total nitrogen (N), ammoniacal nitrogen (NH4-N), total phosphorus (P), and potassium (K).

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  • A computer-intensive random resampling technique was used to determine the minimum samples needed for +/- 10% accuracy at 99% probability.

    • Main Results:

    • Manure sample variability (CV) was 6-8% for agitated manure but 20-30% for unagitated manure.
    • Reliable testing of total N and P required only 3-5 samples for agitated manure, but at least 40 samples for unagitated manure.
    • Discrepancies between book values and measured manure nutrient content varied widely, indicating potential inaccuracies of using standard estimations.

    Conclusions:

    • Agitation significantly reduces the number of samples needed for reliable manure nutrient analysis.
    • Relying on book values for manure nutrient content can be problematic due to high variability in actual farm data.
    • Optimized sampling strategies are essential for accurate manure nutrient management, supporting both environmental protection and agricultural productivity.