for purposes of classification, the lower boundary of soil is arbitrarily set at ?? below the...
TRANSCRIPT
For purposes of classification,
the lower boundary of soil is arbitrarily set at ?? below the
surface
1
What are the 6 levels of USDA Soil Taxonomy?
__a_____b_______C________d____
____e____
How many?
Which level is named after the place where it was first identified?
2
Diagnostic sub-surface horizons
Why does USDA Soil Taxonomy place so much emphasis on sub-surface diagnostic horizons?
3
What is the soil order ? “new soils”
sands, river bottoms
4
What is the soil order? “immature soils”
Which master
horizon is just
starting to form in this soil?
5
The central concept of ????? is that of soils with an argillic, a kandic, or a natric subsurface diagnostic horizon and a base saturation ≥ 35%
“fertile forest soils”
What is the soil order?
Thin A horizon
well developed B horizon
weak E horizon
rich in Ca and Mg
6
What is the soil order? “red and yellow acid soils”
Only recently mapped in southern IL
strongly developed B horizon
distinct E horizon
Thin A horizon
low in Ca and Mg
7
What is the soil order? “black prairie soils”
thick A horizon(s)
well developed B horizon
8
What is the soil order?“muck or peat soils”
9
Richter and Markewitz (2001)
a b c d
Identify the soil orders (labeled a,b,c and d)in this conceptual chronosequence
E
10
Geographic extent of the Drummer soil series
Family = Fine-silty, mixed, superactive, mesic Typic Endoaquolls
What is the soil order?11
What is the soil order?
12
What is the hue of the Ap horizon?What is the chroma of the Bt1 horizon?
13
What is the term for “soils that are found together”?
NCSU Soils technical bulletin 314
14
What is soil micromorphology ?
15
Matric forces
+
a + b
Soil Skin
16
a
b
What is the name of the soil water
status when all the water susceptible
to the pull of gravity has drained?
Identify realistic soil
water tensions in bars or kPa for points a and b on this
diagram
17
H20
H20
H20H20
Just like a ball rolling down hill, water molecules
travel upward through plants
when the water tension along the path from soil to the atmosphere is increasingly
negative
b
a-0.3 bars
Identify realistic soil
water tensions (in bars) for
points a and b on this
diagram
18
Soil water is a switch that activates or deactivates soil biology
Water is considered biologically available, when soil organisms are able to win the “tug
of war” with the soil
Is it harder or easier for
organisms to win the water tug of war in a salty soil.
Briefly explain.
19
What is the purpose of a characteristic curve?
What is the volumetric
water content at field
capacity in the soil
represented by this curve?
If the rooting depth is 100 cm, how many cm of water are plant available in this soil?
20
Which texture can hold the most water?
Available water
Brady and Weil, 2002
Which texture can hold the most plant available water?21
At what soil water tension (in bars) would you want to start irrigating a tough crop like corn growing in a clay soil ?
Wimpy crops
Tough crops
Critical moisture levels to avoid crop stress
22
How does a gypsum block soil moisture sensor
work?
23
Coarse textured layer
Fine textured layer
How does the presence of a coarse textured layer under a fine textured layer affect percolation ?
Be sure to explain your answer.
24
Briefly discuss something interesting related to soil that you learned about in the last month that you have not yet discussed on this quiz.
25