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Soils 7
stuff from assignment 7
| Question | Answer |
|---|---|
| Particle density equation | Dp=Mass dry soil (Ms)/Volume of solid (Vs) |
| Bulk density equation | Db=Mass dry soil (Ms)/Volume Soil (Vt) |
| What is the common value for particle density? | 2.65 g/cm^3 |
| What 5 things can affect bulk density? | Compaction, tillage, structure, roots, or texture |
| Low bulk density equals. . .? | Less compaction |
| Common values for low bulk density | 1.1-1.4 g/cm^3 |
| Common values for high bulk density | 1.4-2.0 g/cm^3 |
| What are the two equations for % pore space? | %PS=Va+Vw/Vt x 100% And %PS=100% - (Db/Dp x 100%) |
| What happens to the %PS when the bulk density decreases? | The %PS increases. |
| What is more important: %PS or pore size? | Pore size |
| Macropores | Pores that water generally drain from, usually filled with air and found in sandy soils |
| Micropores | Pores that hold water; usually for plant use, found in silt and clay soils |
| Why is air filled pore space important? | 1. Effects respiration in soil 2. Provides oxygen in the soil for plant roots 3. Allows for spaces where roots can grow. |
| What is the equation for % air filled pore space? | %AFPS=Va/Vt x 100% |
| At what % air filled pore space should there be concern? | Anything below 10% |
Created by:
KayNelsen
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