Test 3

Question 0

Increase whc

Answer 0

Increase om

Question 1

Water captured be improved?

Answer 1

Maintain om and vegetation

Question 2

Fresh water used in agr?

Answer 2

70-80%

Question 3

Ways to save irrigation water?

Answer 3

Use high efficiency irrigation system water based on need not time

Question 4

Soil aeration important?

Answer 4

Reduce toxic gas in soil

Question 5

Factors that determine oxygen availability to roots?

Answer 5

Organisms in soil

Water flow through the soil

Question 6

Water content important in soil aeration?

Answer 6

Water can block airflow

Question 7

How does co2 differ in soil vs atmospher?

Answer 7

Soil is higher

Question 8

Oxygen levels in soil profile?

Answer 8

Down less oxygen

Question 9

Role of o in oxidation?

Answer 9

It is an oxidizing agent

Question 10

What molecule acts as an oxidizing agent?

Answer 10

Sulfate (SO4)

Question 11

Poor aeration

Answer 11

Toxic gas is trapped

Effects microorganisms

Question 12

Effects of soil temps on plants

Answer 12

Biochemical reaction rates

Question 13

Soil solarization

Answer 13

Increase temp to kill microorganisms

Question 14

Freezing thawing cycles

Answer 14

Breaks rocks down

Pushes objects in soil to surface

Question 15

Manage soil temps

Answer 15

Mulch prevent temp changes

Irrigate to cool

Question 16

Soil colloid

Answer 16

Small partials usually negative in acid soils and play role in cation exchange

Question 17

Name mineral colloid

Answer 17

Non-crystalline silacates

Question 18

Most abundant colloid

Answer 18

Crystalline silicates

Question 19

Composition and # of sheets tells us?

Answer 19

Type of clay particles

Question 20

Charges appear on colloids

Answer 20

Along the edges

Question 21

Development of mineral colloids

Answer 21

Breaking of the edges

Question 22

Characteristic of a crystalline clay?

Answer 22

Expanded-2:1 space between the sheets

Question 23

How ate humus colloids created?

Answer 23

Decomposition and altering of plant residues through microorganisms

Question 24

Process of cation exchange

Answer 24

Reverse process where you change positively charged ions

Question 25

For Cation exchange what needs to be present?

Answer 25

Water

Question 26

Cation exchange principals

Answer 26

Reactions are reversible | charges must match ratios

Question 27

CEC

Answer 27

The ability of the soil to hold or substitute cations

Question 28

Important a of CEC?

Answer 28

General idea of liming needs | Soils hold on nutrients

Question 29

Why does low ph reduce CEC?

Answer 29

Because hydrogen occupies all the the negative charges

Question 30

CEC release to plants by?

Answer 30

Cations must be released from CEC before they can be taken up by plants

Question 31

Base saturation and why important?

Answer 31

The presence of base cations in soil | Shows how much leaching and liming needs

Question 32

Basic and acid cation

Answer 32

Ca base al acid

Question 33

Legume roots deficiency?

Answer 33

They like to absorb 2+ ions and k+ is only 1

Question 34

Bonding of biomolecules to clays info?

Answer 34

Bonds rapidly and strong