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