Lecture 3 Flashcards
Texture, structure, color and porosity are all ________ properties of a soil
physical
If organic matter in a soil is removed or destroyed, mineral particles of the soil _______
remain
Soil particles are divided into______ based on the_______of the particles
sand, silt and clay, diameter
- Clay has less than ___ diameter
- Silt has between ___ and ___ diameter
- Sand has between _____ and _____diameter
- 2u
- 2u and 60u
- 60u and 2000u
The relative percentages of sand, silt and clay in a soil refers to…….
Soil texture
Texture is loosely described using the…..
fine-course range
Normal soil consists of…..
sand, silt and clay particles
Soil with over 40% clay particles, less than 40% silt and less than 45% sand is described as……
Clay
Soil with between 70% and 90% sand, less than 30% silt and 15% clay is ……..
Loamy soil
Texture can be determined by……
Feel, Laboratory, the use of Textural Triangle or by manipulative
Soil Texture Triangle compares the composition of soil particles to determine the……
soil type
Fine textured soils has more pore space than coarse textured soils because……
You can pack more small particles into a unit volume than larger ones.
Fine textured soil drains slower/faster than as coarse textured soil.
slower
Fine textured soils holds ______water than coarse textured soils.
more
The degree of connectivity between soil pores is known as______
Permeability
A highly permeable soil is one in which water runs through quite readily. True or False?
True
Coarse textured soils tend to have large, well connected pore spaces. Will permeability be high or low?
High
The arrangement of soil parts and pore spaces between then is referred to as……
soil structure
Soil particles are arranged in small rounded units. What is this called?
Granular
Soil particles are arranged to dorm block-like units which are about as wide as they are high or long is called……
Blocky
Blocky soils are common in
subsoil
Soil particles are arranged in plate-like sheets which are approximately horizontal in the soil is
Platy
Soil particle in this type of soil structure are arranged into large peds with long vertical axis.
Prismatic
The greater the degree of aggregation, the ______pore spaces available to ________ to the plant roots.
more, supply air and water