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25 Cards in this Set

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the access of all people at all times to the food they need for an active and healthy life.
food security
flooding fields with water then allowing the water to evaporate from shallow standing pools.
"flood and furrow" irrigation
the oversaturation of soils with water
waterlogging
the buildup of salts in the surface layers of soil.
salinization
the movement of soil from one place to antoher by wind or water action.
erosion
10% or more loss in productivity
desertification
several layers that soil is made up of
horizions
a cross section from the surface to the bedrock
soil profile
the uppermost layer of the soil profile
O horizion
the layer below the O horizion
A horizon
What the A horizion soil is commonly reffered to as
topsoil
The horizion directly below the A horizion
E horizion
loss of some minerals occur
eluviation
Dissolving minerals from the E horizion as it goes and carrying them to the next lower horizion
leaching
where the illuviation or accumulation of leached minerals occurs
B horizion
The horizion known as the bedrock horizion
horizion R
direct result of the soil constituants and can be an indicator of soil fertility
soil color
has particles less than 0.002mm in diameter
clay
particles ranging from .002mm to .005 in diameter
silt
soils that have an even mixture of all three particle sizes
loams
size of spaces between soil particles
soil porosity
a measure of the arrangement of clay, silt, and sand particles into aggregates (clumps)
soil structure
a measure of how acidic or alkaline the soil is
soil pH
stored in rocks and only can be removed as the rocks weather.
phosphorus
stored in rocks and released when weathered
potassium