Name:

Soil Identification Fill-in

  1. Identification is based upon the __________ ______________________________.
  2. Soils develop horizons
    1. recognizably different ____________________ that are parallel to the surface
    2. Horizons form :
      1. because of differences in ___________________
      2. accumulation of ______________________ __________________________
      3. movement of ______________________ __________________________
    3. horizons form the __________ ______________________________
  3. There are currently about _________________ defined soils in the ________________________.
  4. Soils are usually named for the first location where they were sampled and __________________.
  5. On Whidbey Island we have _______ unique soils.
    Examples of Whidbey Soils
    Name Parent material Ave. bushels of wheat/acre
    _____________ loam marine or lake sediments 65
    Hoypus loamy ___________ glacial gravelly drift 10
    Lummi silt ___________ marine sediments n/a
    Puget ___________ loam fine textured stream deposits 55
    Whidbey ___________ loam cemented gravelly till 18
  6. Identifying the soil will determine __________ ______________________ _______________ (BMP) for that soil.

Soil texture:

  1. Texture is an important _______________________ property (other properties are color, structure, density).
  2. Texture is the relative _______________________ of sand, silt and clay in a soil.
  3. When determining soil texture, particles larger than _______________________ are excluded, as is organic matter.
USDA classifications of soil particles
Class Size (mm) Characteristics
  2.0 - 0.05 round or irregularly shaped, not sticky or plastic, low water holding ability
  0.05 - 0.002 irregular shaped, plastic and cohesive
  < 0.002 usually plate-like, sticky and plastic, high surface area to mass ratio, high water holding ability, greatly influences soil properties