ISA Arborist Certification Chapter 3 exam 2023 with 100% correct answers
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organic layer - correct answer -0 Horizon, an unaltered soil, thin layer of decomposing organic matter
Loam - correct answer -A mix of three different particle sizes and is often considered an ideal soil texture because of the favorable characteristics for plant growth.
Not made up of equal m...
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ISA Arborist Certification Chapter 3
exam 2023 with 100% correct answers
organic layer - correct answer -0 Horizon, an unaltered soil, thin layer of decomposing organic matter
Loam - correct answer -A mix of three different particle sizes and is often considered an ideal soil texture
because of the favorable characteristics for plant growth.
Not made up of equal mix of sand, silt, clay. Contains less clay
Topsoil - correct answer -commonly known as the uppermost layers (O,A,E, and sometimes the
upperpart of B horizon)
C Horizon - correct answer -Deepest Soil layer composed of partially weathered parent material. Soil in
this horizon is continually forming.
A Horizon - correct answer -Contains most of the fine absorbing roots of trees and is very biologically
active. Rich in organic matter.
E Horizon - correct answer -Between the A and B Horizon, lacks the organic matter as in A, has lighter
color due to this.
Absorbing Roots - correct answer -Roots found in the upper 6-10 inches of soil
Roots - correct answer -Few_____ grow deeper than 3 to 4 ft.
Soil Structure - correct answer -Shape, size, strength, and arrangement of soil aggregates form ____.
, Micropores - correct answer -Soil pores that retain water and are the source of available water to plants
between rainfalls.
Macropores - correct answer -Soil pores too large to hold water against the force of gravity and become
filled with air as water drains from the soil.
Bulk Density - correct answer -Mass of dried soil per unit of undisturbed soil volume. Can be used to
assess whether adequate pore space exists.
Sand - correct answer -Soils with a high percentage of _________ are less prone to compaction.
Clay - correct answer -Soils with a high percentage of ______ are easily compacted.
pH - correct answer -The measure of the acidity or alkalinity of soil.
pH 7 - correct answer -pH neutrality
pH 0-6.5 - correct answer -Acidic
pH 7.5-14 - correct answer -Alkaline
pH 6.0 to 6.5 - correct answer -Generally favorable pH for most trees
Highly Alkaline soils - correct answer -iron, zinc, and manganese may be unavailable. calcium,
magnesium, and potassium may become more available.
Highly acidic soils - correct answer -Phosphorus may be unavailable.
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