Activity 5 - Soil Analysis Flashcards
what is soil
- foundation which all terrestrial and freshwater life depend
- medium for plant growth
- reservoir for minerals
lead to the development of distinct series of vertical layers or horizons
soil-forming processes
distinct series of vertical layers or horizons
soil profile
Soil horizons
- O
- A
- B
- C
how are each horizon characterized
distinct color intensity
O horizon
topmost layer deposited with organic matter
A horizon
minerals and large amounts of organic matter
B horizon
collected leached materials from A horizon
C horizon
weathered parent rock material unconsolidated into the soil
one of the important and permanent features of soil
texture
soil texture
relative fraction of differently-sized particles in soil
classifications of soil based in its texture
- clay
- silt
- sand
- gravel
- loam
loam
mixture of sand, silt, and clay
materials used in act 5 (substrate analysis)
- field notebook
- pencil/ballpen
- tape measure
- meter stick
- bolo/shovel
- camera
- 2 graduated cylinder
what were observed in act 5 (substrate analysis)
- soil profile
- soil fraction
dimension in soil profile
1.5 meter width
1.5 meter depth
soil samples
- from standing water
- from running water
amount of soil sample per graduated cylinder
125 mL
duration of agitating sediment-water mixture
5-10 minutes
duration of allowing sediments to settle
at least 24 hours
formula for getting percentage of sediments
(no. of mL occupied by sediment / total mL of soil) (100)
scientific principle applied in hydrometer technique
Archimedes’ Principle
Archimedes’ Principle
a body that is immersed in fluid, whether partially or fully, is buoyed by a force equal to the weight of the fluid displaced by the immersed body
When was act 5 - soil analysis performed
Oct. 19, 2023
