Chptr 3 Flashcards
Driving vehicles across wet soil will _________ the soil and destroy the soil ________ _________
Compact, pore space
The majority of the fine, absorbing roots of a tree are in the ___ and ___ horizons
O, A
If lime is added to a soil to change the pH, but there is no significant change, which soil property is preventing pH change? ___________ ____________
Buffering capacity
True/false— negatively charged clay particles hold cations near their surface.
True
In one foot of clay soil with 4 inches of water in soil, approximately how many inches of water would be available to the tree?
1”
_____ __________ modifies the effects of soil texture as soil particles form clumps or aggregates.
Soil structure
On pH scale, less than 7 is _______, 7 is _________, and more than 7 is ___________
Acidic, neutral, alkaline
True/false– soil structure can be more important than soil texture in determining oxygen and water availability
True
A pH of 5 is ______ times more acidic than pH of 7
100
The process in which dissolved minerals wash down through the soil profile and are lost is called _________
Leaching
Many essential elements are dissolved in soil water in the form of positively charged particles called?
Cations
If the soil is too _______, iron and manganese May be in a chemical form that is unavailable to trees
Alkaline
The buffering capacity is the resistance of a soil to changes in pH . Clay soils and soils high in organic matter usually have a _______buffering capacity
High
The ____________ is a zone of intense biological activity near the actively elongating roots.
Rizosphere
True/false– all of the water in the upper 12” of soil is available to the tree roots?
False
