ENVS 2060 Lecture Notes - Lecture 12: Bulk Density, Tillage, Soil Life
31 Mar 2016
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Document Summary
Water that is accessible comes from the medium sized pores (held in one place but not too tightly) Increase in bulk density due to loss of large pores. Aggregates reorient themselves and orient closer together. Further compaction, breaks aggregates, fragments into spaces in between, loss of more macropores. Increase micropores (making new ones out of macropores) Less contact between pores water moves slower. Clays aggregate better, can break and be afected by compaction: compaction vs. shear. Adding a load (just compaction) increasing soil bulk density, loss of macropores. Creating ruts compaction but also shear. Eforts to reduce the angle: adding weight on one side (lead, making one sides pillars taller than the other. Proile higher bulk density (not churned up to create new pores) Change over time (several years) last years channels are still there, ability for roots to grow: conventional tillage. Proile (in tillage zone, below tillage zone)
