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Intro To Soil Science > Soil pH > Flashcards

Soil pH Flashcards

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1
Q

Define pH

A

pH= -log ｜H+｜???

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2
Q

What is Active Acidity

A

In soil solution

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3
Q

What is Reserve Acidity

A

On Cation exchange sites

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4
Q

How can you find Total Acidity

A

Total Acidity= active + reserve

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5
Q

Where are micronutrients and macronutrients availability maximized on the pH scale

A

6.5

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6
Q

Buffering Capacity

A

The solubility against rapid pH changes

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7
Q

What is Buffering Capacity determined by

A

Amount of CEC and the amount of Reserved acidity

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8
Q

What does Buffering capacity determine

A

The amount of Lime and Sulfur to change soil pH

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9
Q

What is the importance of soil pH

A

Nutrient availability

Makes balance of cations on CE sites
Influenced chemical forms
Alters microbial activity

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10
Q

What Two factors affect soil pH

A
  1. Carbonate content of soils
  2. Leaching status of soils
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11
Q

How is Hydroxide produced

A

It is produced when free calcium carbonate is available

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12
Q

Describe the conditions that result in ACIDIC REGIONS

A

Humid region
High rainfall
Bases leached

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13
Q

Describe the conditions that result in NEUTRAL to ALKALINE CONDITIONS

A

Arid regions
Low rainfall
Bases remain

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14
Q

What are 5 sources of Acidity

A
  1. Acid parent material
  2. Respiration by Roots and Microbes
  3. Decomposition of OM-produces strong acids
  4. Leaching & plant uptake of basic cations
  5. Addition of amendment that will alter pH
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15
Q

What pH value does Aluminum become soluble

A

pH<5.0

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16
Q

As Aluminum becomes ______ it brings more _____

A

More soluble
Hydrogen ions

NOT GOOD

17
Q

As base saturation ______ pH ______

A

Increases
Decreases

18
Q

In what two ways can we alter soil pH
And what are their affects

A

Adding Lime- Increase
Adding Sulfur- Decrease

19
Q

How can we determine the Lime requirement

A

Soil test- Reserve acidity

20
Q

What is the Lime Requirement depend on

A

CEC

Soils with longer CEC have higher Buffering Capacity & offer greater resistance to change in pH

21
Q

What are the Two forms of Lime

A

Calcite
Dolomite

22
Q

What can be applied for quicker reactions?

A

Calcium Hydroxide

23
Q

What is the preferred particle size & method to change pH with Lime

A

Medium particles
50% passing through 100 mesh screen
Must apply evenly and mix

Intro To Soil Science (2 decks)

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