Exam 1 Flashcards
(47 cards)
What soil structure has the slowest drainage?
Platy
What soil texture is powdery to the touch?
Silt
What yields Parent Material?
Rocks + Weathering = Parent Material
What conditions do roots have the best development in soil?
Air, water, and nutrients are most optimized
What conditions are best for weathering?
Warm and wet areas
Are pedons 3D or 2D?
They are 3D
What is needed for a proper soil survey?
Description, classification, and mapping
Which horizon has the most granular structures?
The A horizon
What land class is best for long term agriculture use?
Land classes I to III
Black and brown color color indicates what?
That there’s a high amount of organic matter in the soil
Best description of clay texture?
Flat and sticky
List what is most specific to most broad
Series < Family < Order
What does soil mottling indicate?
Patchy and mixed aeration of soil
What are all soil particles together called?
Aggregation (sand, silt, clay)
What is pedology?
The study of soil formation
Are clay particles visible to the eye?
No, they are not
What is the composition of soil?
45% mineral
5% organic matter
25% air
25% water
How much crop residue can conservation tilling return to the soil?
Up to 20%
What is land use classification based off of?
Differences
What is the subsoil horizon?
The B layer
What has the biggest pore size and least reactivity?
Sand
Formula for bulk density
Dry weight/Volume
What gives clay silicates it’s color?
Iron and aluminum
What is the definition of soil for agronomists?
They define soil by it’s ability to support and facilitate plant growth
