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Greenhouse Management Dual Credit - Chapter 2: The Soil
Terms in this set (32)
the thin, outer layer of the Earth's crust made up of weathered minerals, decomposing organic matter, and living organisms
the breakdown of rocks into smaller particles due to the actions of rain, wind, gravity, water movement, and biological activity
A cross-sectional slice made down into the Earth's surface to show the different layers of soil formation.
Organic compounds that do not decompose quickly.
Plowed under green plants.
Soils that weather from bedrock and remain in place
Moved by forces of nature
Have moved in response to gravity
Are carried in water such as rivers
Are transported and deposited by wind.
Soil deposited by glaciers
The relative proportion of soil seperates of different sizes in any one soil.
Enough sand to provide drainage and aeration yet finer particles can retain moister and provide necessary plant nutrients.
particles are irregulary shaped and much smaller than most sand particles.
has very small, plate-like particles. It possess the greatest surface area of all separates.
Soil Texture Triangle
illustrates how soils are named, based on a laboratory determination of their composition.
elements that a plant cannot grow without
have been found to promote plant growth in many species, but have not been proven to be absolutely necessary for completion of the plants' life cycle.
When Nitrogen is not absorbed by the colloidal particles of the soil, it passes quickly through the root region of the soil.
Soil particles adhere together to form larger particles
The soil's water, held between the particles and granules of the soil contains dissolved mineral salts.
Soils is Acidic When...
Soil contains more hydrogen ions than hydroxyl ions
Soil is Akaline When...
Soil contains more hydroxyl ions than hydrogen ions
refers to the capacity of colloidal particles to attract positively charged ions (cations) and to exchange one ion for another.
are nutrient additives applied to the soil periodically to maintain optimum crop productivity.
A fertilizer which provides all three elements: N P K
is the conversion of nirtogen in organic compounds to ammonia.
is the conversion of ammonia to nitrite; then to nitrate
the arrangements of soil particles into aggregates.
occurs when hydrogen ions that are held in absorbed from dissociate from clay particles and enter into the soil solution to replace those hydrogen ions neutralized by the addition of lime.
When less than 30% of the of a complete fertilizers weight represents available nutrients.
When the amount of available nutrients is 30% or more.
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