Flashcards in AC-Ch. 3 Soil Science Deck (44)
Group of soil bacteria resembling fungi. They play a role in the decomposition of organic matter and the release of mineral elements
Close cluster or mix of small particles of soil and/or organic matter of varying sizes that are bonded together; sand, gravel or small rocks in soil and/or sand, gravel, or small rocks used under paved surfaces
Clusters of flowers or fruits that appear as a single unit
Individual tree crowns that form a canopy
Ion that carries a negative charge
Ability of a soil to maintain its pH
Mass of soil per unit volume. Often used as a measure of compaction
Water held in the capillary pores of the soil much of this water can move in any direction and is readily available to plant roots
Positively charged ion.
What are the most abundant cations in soil
Calcium. Magnesium. Potassium. Sodium. Aluminum.
Ability of a soil to absorb and hold cations. Affected by soil pH. Measures soil fertility, clay composition, and enginnering characteristics.
Cation exchanged capacity CEC
Soil particles with a typical grain size less than .004 mm.
Substance or solution that oozes out of injured plant cells or is secreted through membrane pores
Maximum soil moisture content following the drainage of water due to the force of gravity.
Water that drains from the larger soil macropores due to the force of gravity.
Layer of soil within the soil profile
Dark colored, stable form of organic matter that remains after most of the plant or animal residues have decomposed
Atom or a group of atoms with a positive or negative charge
Tendency for elements or compounds to wash down through or into the soil
Soil texture classification based on a certain ratio of sand, silt, and clay. Considered ideal for plant growth.
Relatively large space between soil particles that is usually air filled and allows for water movement and root penetration
Space between soil particles that is relatively small and likely to be water filled
Process in which an organic substance is converted to or trapped in inorganic substance
Microscopic roundworm. Many are beneficial organisms, but some feed on plant tissues and may cause disease or damage
Movement of mineral elements within an ecosystem as organic matter decomposes, releasing bound nutrients back to plants
Layer of organic at the soil surface
Soil bedrock or base material from which a soil profile develops
Point at which a plant cannot pull any more water from the soil and suffers permanent damage.
Permanent wilting point
Unit of measure that describes the alkalinity or acidity of a solution. Negative log of the hydrogen ion concentration.