soil architecture - cornell university architecture.pdf · soil architecture texture structure bulk...
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Soil ArchitectureTexture
Structure
Bulk Density
Organic Matter
Soil ChemistryAcidity and Alkalinity (pH and pOH)
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Soil Texture– Course Fragments, Sand, Silt and Clay
www.cas.umt.edu/ science226/226.soils.htm
http://www.cst.cmich.edu/users/Franc1M/esc334/lectures/physical.htm
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Soil Structure
Spheroidal or Granular
Plate-like
Prism-like
columnar
prismatic
Block-like
angular blocky
subangular blocky
Massive
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Soil compaction (measured by cone penetrometer) was higher for no-till than for other systems in an Illinois study. Data: Illinois, USA. Cited in PPI. Fertilizer mangement for today's tillage systems.
adapted from Soane et al., 1994
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Organic matter
improves structure
improves drainage
improves nutrient availability
decreases bulk density
Suspect if more OM present
Poor drainage
Toxicity issues
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