Page |1
Okstate SOIL 1113 exam 2 Questions and
Correct Answers/ Latest Update / Already
Graded
Chemical Properties affect
Ans: - the speciation of nutrients and availability of nutrients
to plants
- the fate of pollutants in soil
- activity and survival of soil microorganisms
- choice of plants to grow
- soil physical properties
Soil pH
Ans: a measure of the H+ concentration or the acidity of a soil
solution (water in the soil pores)
pH formula
Ans: -log[H+]
pure water concentration
Ans: H+=10^-7
meaning it has a pH of 7
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circumneutral pH
Ans: Near neutral pH conditions; refers to conditions when the
pH of the soil solution is between 6.5- 7.5
under acidic conditions
Ans: soil has limitations in terms of supporting plant growth
and the activity of soil microorganisms
extreme basic conditions
Ans: limit the ability of the soil to perform the production and
ecological regulator functions
low pH
Ans: -high hydrogen ion concentration
-acidic
Guide in crop selection
Ans: most edible foods grow best in slightly acidic soil from 6 -
6.8
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, Page |3
pH determines what in heavy metals
Ans: solubility
how to rise pH levels
Ans: - apply lime
- oxides or hydroxides or carbonates of Ca (calcium) or Mg
(magnesium) are added
CaO and Ca(OH)2
Ans: highly reactive and are often difficult to manage
CaCO3
Ans: not as reactive and easy to manage, cheaper and widely
used
purity of the lime
Ans: any impurities in the lime will reduce its ability to
neutralize acidity
fineness of the lime
All rights reserved © 2025/ 2026 |
, Page |4
Ans: large particles react more slowly and less completely than
fine particles
what should i do for high pH
Ans: apply
- iron sulfates
- organic matter
- ammonium sulfate
How is the soil able to store soil nutrients and treat chemical
contaminants
Ans: clays have a very high surface area, and their surfaces are
usually charged
surface charge for montmorillonite
Ans: -80 to -150
surface charge for vermiculite
Ans: -100 to -200
surface charge for illite
All rights reserved © 2025/ 2026 |
Okstate SOIL 1113 exam 2 Questions and
Correct Answers/ Latest Update / Already
Graded
Chemical Properties affect
Ans: - the speciation of nutrients and availability of nutrients
to plants
- the fate of pollutants in soil
- activity and survival of soil microorganisms
- choice of plants to grow
- soil physical properties
Soil pH
Ans: a measure of the H+ concentration or the acidity of a soil
solution (water in the soil pores)
pH formula
Ans: -log[H+]
pure water concentration
Ans: H+=10^-7
meaning it has a pH of 7
All rights reserved © 2025/ 2026 |
, Page |2
circumneutral pH
Ans: Near neutral pH conditions; refers to conditions when the
pH of the soil solution is between 6.5- 7.5
under acidic conditions
Ans: soil has limitations in terms of supporting plant growth
and the activity of soil microorganisms
extreme basic conditions
Ans: limit the ability of the soil to perform the production and
ecological regulator functions
low pH
Ans: -high hydrogen ion concentration
-acidic
Guide in crop selection
Ans: most edible foods grow best in slightly acidic soil from 6 -
6.8
All rights reserved © 2025/ 2026 |
, Page |3
pH determines what in heavy metals
Ans: solubility
how to rise pH levels
Ans: - apply lime
- oxides or hydroxides or carbonates of Ca (calcium) or Mg
(magnesium) are added
CaO and Ca(OH)2
Ans: highly reactive and are often difficult to manage
CaCO3
Ans: not as reactive and easy to manage, cheaper and widely
used
purity of the lime
Ans: any impurities in the lime will reduce its ability to
neutralize acidity
fineness of the lime
All rights reserved © 2025/ 2026 |
, Page |4
Ans: large particles react more slowly and less completely than
fine particles
what should i do for high pH
Ans: apply
- iron sulfates
- organic matter
- ammonium sulfate
How is the soil able to store soil nutrients and treat chemical
contaminants
Ans: clays have a very high surface area, and their surfaces are
usually charged
surface charge for montmorillonite
Ans: -80 to -150
surface charge for vermiculite
Ans: -100 to -200
surface charge for illite
All rights reserved © 2025/ 2026 |
