The Citizen Science Soil Health Project
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  • Alkaline-soil (2)
  • Alkaline Soil (5)
  • Carbon Sequestration (1)
  • Compost (4)
  • Cover Crops (7)
  • Crop Groups (7)
  • Days Of Living Cover (7)
  • Grazing Animals (13)
  • Grower Feedback (4)
  • Irrigation Water (11)
  • Knowledge (4)
  • Longitude (2)
  • Manure (5)
  • Median (9)
  • Microbial life (4)
  • Organic Growing Methods (4)
  • Organic Matter Inputs (17)
  • Past Soil Testing (1)
  • Perennial & Annual cropping (3)
  • PH (8)
  • Phosphorus (3)
  • PLFA (Phospho-lipid Fatty Acid Test) (4)
  • Progress (18)
  • Sample Depth (1)
  • Seasonal Variation (1)
  • Soil Organic Carbon (1)
  • Soil Organic Matter (9)
  • Soil Texture (2)
  • Tillage Intensity (13)
  • Variability (13)
  • Published on
    March 16, 2023

    Characteristics of Highly Variable Sites

    Variability
    Image description
    We examined our 28 sites which have the most variability in their soil health scores.  We call these sites our “Swingers”, and they are evenly split between organic and conventional growing methods. 
    Over half the “Swinger” sites are pastures with the rest split evenly between home gardens and commercial vegetable sites.  Their most common crop is grass hay with mixed vegetables coming in second. Their average water season is 127 days long.  “Swinger” sites have an average soil health score of 27.6, which is very high, especially for Colorado.  The growers of these “Swinger” sites are all Soiley Award winners or nominees.  They have adopted many soil health practices, as you can see in the following graph.
    Characteristics of Highly Variable Sites
    The lesson here seems to be that no good deed goes unpunished.  It seems that one result of adopting good soil health practices may be a great deal of variability in soil health lab results.  If you see your Haney test results bouncing around a lot, year-to-year, it does not necessarily mean that you are doing anything wrong.  It may mean that you are doing many things right!  We will explore this hypothesis further in coming years as we gather more data.
  • Published on
    March 16, 2023

    Variability due to Grazing Animals & Organic Matter Inputs

    Grazing Animals Organic Matter Inputs Soil Organic Matter Variability
    Variability due to Grazing Animals & Organic Matter Inputs
    In the top graph above, 71 sites with both grazing animals and organic matter inputs (OMI) are each represented by a quadruplet of data points connected by a vertical black line (a blue square for 2019, red circle for 2020, green triangle for 2021, and yellow diamond for 2022).  Each square-circle-triangle-diamond-black-line combo represents the Soil Organic Matter (SOM) values for one site for 4 years. According to the literature, SOM is supposed to be quite stable and very difficult to change, and yet we are seeing large swings in individual sites’ SOM data, especially when grazing animals are present or organic matter is imported to the site, as is the case in the top graph above.
    We only have 12 sites in our study which have no grazing animals or imported organic matter for 3 or more years.  The second lower graph shows that the variability in SOM values for these 12 sites is much less than for sites with grazing animals or organic matter inputs.

  • Published on
    August 15, 2022

    After 3 years, we cannot show progress in improving soil health at individual sites.

    Progress Soil Organic Matter Variability
    Variable progress improving soil health
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  • Published on
    August 15, 2022

    Grazing animals on site increase the variability in our data.

    Grazing Animals Progress Soil Organic Matter Variability
    Soil test variability from grazing animals
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  • Published on
    August 15, 2022

    Our project has had mixed success in reaching its original objectives so far.

    Knowledge Progress Variability
    Success meeting goals and objectives
    Read More
  • Published on
    August 15, 2022

    Soil samples collected in the spring have lower scores than samples collected in the fall.

    Median Seasonal Variation Variability
    Spring versus Fall soil testing
    Read More
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4340 N 13th St.
Boulder, CO 80304



Elizabeth@ElizabethBlackArt.com


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This material is based upon work that is supported by the National Institute of Food and Agriculture, U.S. Department of Agriculture, under award number 2021-38640-34695 through the Western Sustainable Agriculture Research and Education program under sub-award project number G351-22-W9210. USDA is an equal opportunity employer and service provider.  Site powered by Weebly. Managed by pair Networks