ISA Arborist Certification Chapter 3 - Soil
Science
Gypsum - ✔️✔ Correct Answer Used to displace sodium in the
soil. (calcium based)
Rhizosphere - ✔️✔ Correct Answer Microzone of intense
biological activity surrounding actively elongated roots. pH can be 1 or
2 units higher or lower in this zone compared to the bulk soil pH
exudates - ✔️✔ Correct Answer Substance or solution that
oozes out of injured plant cells or is secretly through membrane pores
Mycorrhizae - ✔️✔ Correct Answer " Fungus Roots"Specialized
root structures created when mycorrhizal fungi infect roots of a
suitable host plant. Many plants have associated of these. Live in a
symbiotic relationship with roots. roots provide the sugar for this. The
fungi increases the capacity of roots to absorb water and essential
, elements, esp. phosphorus. Can help the tree survive stressful
conditions.
Actinomycetes - ✔️✔ Correct Answer type of bacteria that can
be in a symbiotic with some species and play a critical role in the
decomposition of organic matter to form humus. This bacteria is
responsible for the "Earthy" smell of rich, healthy soil.
Humus - ✔️✔ Correct Answer Dark colored, stable form of
organic matter that remains after most of the plant or animal residues
have decomposed.
Soil microorganisms - ✔️✔ Correct Answer Works as storage
bank for plant nutrients
Mineralization - ✔️✔ Correct Answer The process in which
organically bound (in microorganisms)plant nutrients are converted
into inorganic, plant -available forms
Science
Gypsum - ✔️✔ Correct Answer Used to displace sodium in the
soil. (calcium based)
Rhizosphere - ✔️✔ Correct Answer Microzone of intense
biological activity surrounding actively elongated roots. pH can be 1 or
2 units higher or lower in this zone compared to the bulk soil pH
exudates - ✔️✔ Correct Answer Substance or solution that
oozes out of injured plant cells or is secretly through membrane pores
Mycorrhizae - ✔️✔ Correct Answer " Fungus Roots"Specialized
root structures created when mycorrhizal fungi infect roots of a
suitable host plant. Many plants have associated of these. Live in a
symbiotic relationship with roots. roots provide the sugar for this. The
fungi increases the capacity of roots to absorb water and essential
, elements, esp. phosphorus. Can help the tree survive stressful
conditions.
Actinomycetes - ✔️✔ Correct Answer type of bacteria that can
be in a symbiotic with some species and play a critical role in the
decomposition of organic matter to form humus. This bacteria is
responsible for the "Earthy" smell of rich, healthy soil.
Humus - ✔️✔ Correct Answer Dark colored, stable form of
organic matter that remains after most of the plant or animal residues
have decomposed.
Soil microorganisms - ✔️✔ Correct Answer Works as storage
bank for plant nutrients
Mineralization - ✔️✔ Correct Answer The process in which
organically bound (in microorganisms)plant nutrients are converted
into inorganic, plant -available forms
