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soil
soil
soil Surface layer of loose material resting on top of the rock which makes up the surface of the Earth. It consists of undissolved minerals produced by the
weathering and breakdown of surface rocks, organic matter, water, and gases. The organic remains provide the
humus and the inorganic particles provide vital minerals. Soils are classified by structure and texture. The structure is determined by the aggregation of particles (peds). The four main textures of soil are
sand,
silt,
clay, and loam. Loam soils are best for cultivation, since they are able to retain more water and nutrients.
Erosion and mismanagement are the chief causes of soil infertility.
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Positioning soil survey for the 21st century.
Magazine article from: Journal of Soil and Water Conservation; 1/1/1996; ; 700+ words
; ...written. It is that the soil survey will never be completed...time when knowledge of soils will be complete. Our...The number and type of soil survey customers has expanded...agronomists, needs for soils information. For example...to different degrees of soil erosion (D
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State soils of the United States.
Magazine article from: Journal of Soil and Water Conservation; 7/1/1995; ; 700+ words
; ...shown in Table 2, have state soils selected by soil scientists within the state...common and scientific names of soils. Soil scientists use soil taxonomy...for good stewardship of the soils. The degradation of soil and water by erosion or by...
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Soil and Water Quality: an Agenda for Agriculture
Magazine article from: Journal of Soil and Water Conservation; 9/1/1994; ; 700+ words
; ...protecting water quality. In many ways, soil quality is one measure of ecosystem health. Conserving soil quality means protecting the full range of ecological services high-quality soils provide. Soil management can either improve or degrade...
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Soil quality fundamentals
Magazine article from: BioCycle; 10/1/2003; ; 700+ words
; ...capacity of natural soils or soil substitutes to support...function or use of the soil. In these articles, soils are primarily considered...Pedology, the science of soil formation and classification, tells us that soils are dynamic natural...
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Soil testing for phosphorus: comparing the Mehlich 3 and Colwell procedures for soils of south-western Australia.
Magazine article from: Australian Journal of Soil Research; 11/1/2003; ; 700+ words
; ...sodium bicarbonate soil test for E is used...current P status of soils when providing P...different elements in soils. The procedures...different reagents, soil:solution ratios...1). After the soils had been used to measure soil test P in the original...
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Soil development on a l,500-year-old beach ridge plain, Sturgeon Bay, NW Lower Michigan.(Report)
Magazine article from: Michigan Academician; 9/22/2008; ; 700+ words
; ...relatively well-preserved soils are found, natural soil development remains inherently...by examining samples from soils with similar soil formation conditions, except...chronosequence studies of natural soil formation in sandy soils, often spanning several...
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SOIL CHEMISTRY AND THE QUALITY OF HUMUS
Magazine article from: BioCycle; 4/1/2004; ; 700+ words
; ...the dynamic nature of soils. Soil chemistry is fundamentally...research laboratories, soils are very complex chemical systems. Soil water is more accurately...fundamental to the function of soils as plant growth media. SOIL SOLUTION Inorganic constituents...
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Soil quality indices and their application in the hilly loess plateau region of China.
Magazine article from: Australian Journal of Soil Research; 9/1/2006; ; 700+ words
; ...spatial variance of soil quality. All of...differences between soils, complexity of environments within which soils exist, and the variety of soil and crop management...modified for different soils and used to enumerate dynamic soil quality ratings...
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Soil amendment user's guide.(FIELD SCIENCE)
Magazine article from: SportsTURF; 10/1/2006; ; 700+ words
; ...learn how to evaluate soil fairly effectively just...own senses. Remember, soils can change, so it is...years) re-evaluate your soil. Soil evaluation techniques...up about 2.5% of the soil mass in agricultural soils. You can estimate the...
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Soil quality fundamentals - water and air essentials
Magazine article from: BioCycle; 11/1/2003; ; 700+ words
; ...segment of the article focuses on water and air in soils and the influence of organic matter, soil texture and soil structure. WATER MOVEMENT, STORAGE AND AVAILABILITY Soils serve as an important gatekeeper in the hydrologic...
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soil classification and description in engineering geology
Book article from: The Oxford Companion to the Earth
...particles adhere after the soil is wetted and subsequently...required to crumble the soil: this definition excludes those soils in which particles adhere...moisture content at which a soil may be rolled by hand...diameter; non-cohesive soils will crumble before...
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soils
Book article from: The Oxford Companion to the Earth
soils It is possible to define soil in many ways. A useful...vertical arrangement of the soil horizons down to parent material. The fact that soils can be grouped into broad...state factors . Factors of soil formation Soils develop as a result of...
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soil
Book article from: The Columbia Encyclopedia, Sixth Edition
...of the developing soil are also factors. Acidic soils occur in humid regions...publications. Undisturbed soils tend to form layers...Russian system of soil classification, from...machinery, can degrade soil structure. Agricultural soils are also vulnerable...
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Soils
Book article from: World of Forensic Science
Soils Soil on a suspect's shoe or splattered...suspects and crime victims. Soil is the product of biological...materials at Earth's surface. Soils form in horizons, or layers...structure of minerals in the soil. Soils that are, or once were, adjacent...
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Soil, Physical Characteristics of
Book article from: Plant Sciences
...and gases through soils is affected by the particles. Soil mineral particles...used to determine a soil's textural class. For example, soils containing equal...percent in compacted soils to 60 percent in...well-aggregated soil. Macropores, also...
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