Soil Moisture Regimes

Question 1

Aquic soil moisture regime

Answer 1

Soils saturated with water and normal years. Characteristics include water saturation, oxygen depletion, and chemical reduction. Infer from redox features.

Question 2

Nonaquic soil moisture regime

Answer 2

Aridic, torric
Perudic
Xeric
Udic ustic

Question 3

Water saturation

Answer 3

1 Endosaturation: all layers from the upper boundary of saturation to a depth of 2 m are saturated.
2 episaturation: saturated in one or more layers above 2 m (perched water table)
3 anthric saturation:caused by puddling, for rice sndcrsnberrys

Question 4

Aridic or torric (synonymous)

Answer 4

Control section is dry greater than half the time when temperatures are greater than 5°C at 50 cm depth. Moist less than 90 consecutive days when temperature is greater then 8°C and 50 cm depth excludes and Riddick from permafrost and cry at STR. Irrigation is essential for crop growth.

Question 5

Perudic

Answer 5

P>Ep in everymonth. No grain crops, continuous humid conditions

Question 6

Xeric

Answer 6

Only in temperate areas, MASThalf the time when t>5C
Dry in all parts>45 days in the summer
Moist in all parts>45 days in winter

Question 7

Udic

Answer 7

Most of Wisconsin. Control section is moist greater than 90 days. Adequate moisture for growing crops

Question 8

Ustic

Answer 8

Control section is dry greater than 90 days. Can grow rain fed crops.

Question 9

Roughly dry to moist smr

Answer 9

Aridic/torric, xeric, ustic, udic, perudic

Question 10

How to define soil moisture regime

Answer 10

“Normal” based on 30 yrs of data. This +/- 1 standard deviation. Must measure runoffon directly

Dry, saturates or moist-the three conditions