Cropping Practices and Organic Matter - PowerPoint PPT Presentation

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Cropping Practices and Organic Matter

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To show how cropping practices affect the Organic Matter of soil. Greater OM content, greater water holding capacity. Less erosion. All around soil health-Tilth ... – PowerPoint PPT presentation

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Title: Cropping Practices and Organic Matter


1
Cropping Practices and Organic Matter
  • By
  • Cody Petersen and
  • Seth Marable

2
Objectives
  • To show how cropping practices affect the Organic
    Matter of soil
  • Greater OM content, greater water holding
    capacity
  • Less erosion
  • All around soil health-Tilth
  • Serves as buffer

3
Hypothesis
  • We hypothesize that with intensive cropping
    practices and irrigation, organic matter will be
    a smaller percentage of the soil composition.
  • Other factors affecting OM
  • Crop selection
  • Stem types
  • Leaves
  • Roots

4
Field ProceduresSamples collected from ARS farm
in Bushland
  • Row water Maize
  • Drip Maize
  • Fallow dryland Maize
  • Linear irrigated Maize
  • Irrigated Beets
  • Buffalo Grass
  • Surface/drip Soybeans
  • Sub/drip Soybeans
  • Fallow dryland wheat/No-till
  • Irrigated wheat
  • Pivot Irrigated Cotton
  • Row water Cotton

5
Lab Procedure
  • Weight bulk sample
  • Oven dry
  • Weight dry samples
  • 2mm Sieve samples
  • Prepare for dry combustion
  • Bake boats
  • DC procedure
  • Run DC over night
  • Transform Carbon percent into OM percent

6
Dry Combustion
  • .5 gram samples into boats
  • Standard samples-used for calibration
  • Run all samples twice
  • Standards at beginning and end
  • Blanks in middle
  • Results are Carbon and Nitrogen gas found after
    900C
  • Standards set the reference point for all samples
    to convert to percentages

7
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11
Results
  • Organic C varied about 0.25 in intensive
    cropping and irrigation practices
  • Cropped soils had less soil organic C than native
    grass

12
Other Results
  • Direct correlation between Nitrogen and Organic
    Matter in all samples (The CN in most soils is
    usually about 10)
  • Bulk density is mostly affected by tillage
    practices
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