Soil redeposition is evaluated by washing clean swatches with the dirty ones.

Soil with a pH value higher than 7. 3 is normally referred to as alkaline.

Clay identification is determined by a process of refiring the ceramic, and assigning a color to it using Munsell Soil Color notation.

Soil erosion ( especially from agricultural activity ) is considered to be the leading global cause of diffuse water pollution, due to the effects of the excess sediments flowing into the world's waterways.

The most commonly used model for predicting soil loss from water erosion is the Universal Soil Loss Equation ( USLE ), which estimates the average annual soil loss as:

Soil is contaminated through particulate accumulation from lead in pipes, lead paint and residual emissions from leaded gasoline that was used before the Environment Protection Agency issue the regulation around 1980.

Environment-current issues: Soil salinity is rising.

According to the Soil Association, the total copper that can be applied to organic land is 6 kg / ha / year.

Soil erosion due to improper land and plough utilization is possible.

Its label states it is approved by the Soil Association and the Vegetarian Society.

Soil is a natural body consisting of layers ( soil horizons ) that are primarily composed of minerals which differ from their parent materials in their texture, structure, consistency, colour, chemical, biological and other characteristics.

Soil is the end product of the influence of the climate ( temperature, precipitation ), relief ( slope ), organisms ( flora and fauna ), parent materials ( original minerals ), temperature, and time.

Soil is composed of particles of broken rock ( parent materials ) which have been altered by chemical and mechanical processes that include weathering ( disintegration ) with associated erosion ( movement ).

Soil is altered from its parent material by the interactions between the lithosphere, hydrosphere, atmosphere, and biosphere.

Soil pH, a measure of the hydrogen ion ( acid-forming ) soil reactivity, is a function of the soil materials, precipitation level, and plant root behavior.

Soil formation, or pedogenesis, is the combined effect of physical, chemical, biological, and anthropogenic processes on soil parent material.

Soil is said to be formed when organic matter has accumulated, and colloids washed downward, leaving deposits of clay, humus, iron oxide, carbonate, and gypsum.

Soil is said to be formed when detectable layers of clays, organic colloids, carbonates, or soluble salts have been moved downward.

Soil is always changing.

Soil texture is determined by the relative proportion of the three kinds of soil particles, called soil " separates ": sand, silt, and clay.

Soil density, particularly bulk density, is a measure of soil compaction.

** Soil erosion – process by which soil is removed from the Earth's surface by natural processes such as wind or water flow, and then transported and deposited in other locations.

Soil is not only a support for vegetation, but it is also the zone beneath our feet ( the pedosphere ) of numerous interactions between climate ( water, air, temperature ), soil life ( micro-organisms, plants, animals ) and its residues, the mineral material of the original and added rock, and its position in the landscape.

Soil science professionals commonly stay current in soil chemistry, soil physics, soil microbiology, pedology, and applied soil science in related disciplines

USDA Soil Taxonomy developed by United States Department of Agriculture and the National Cooperative Soil Survey provides an elaborate classification of soil types according to several parameters ( most commonly their properties ) and in several levels: Order, Suborder, Great Group, Subgroup, Family, and Series.

Soil creep in the upper few feet of soil on a slope is commonly reflected in the bowing of trees on the slope.

Soil contamination is sometimes related to such surface runoff, but more importantly is associated with soil contamination from underground fuel tanks or auto servicing operations which commonly are ancillary uses of car wash sites — but not an issue for car washing itself.

Soil crusts develop most commonly in arid and semi-arid environments by biological organisms from diverse lineages binding together inorganic and organic portions of the soils.

Shortly before he became Agong in April 1984, Sultan Iskandar issued a proposal for the Orang Aslis to be referred to as the " Bumiputera Asli " ( literally, Original Sons of the Soil ).

The change in tone and partisanship in the Democratic Review that Breckinridge referred to was mostly a reaction by the increasingly divided Democratic Party to the growth of the Free Soil movement, which threatened to dissolve any semblance of Democratic unity that remained.

Ecology / Conservation, often referred to as " Econ ," teaches a large amount of merit badges including Astronomy, Bird Study, Environmental Science, Fish and Wildlife Management, Forestry, Mammal Study, Nature, Soil and Water Conservation and Weather.

* Soil Science – study of soil as a natural resource on the surface of the earth including soil formation, classification and mapping ; physical, chemical, biological, and fertility properties of soils ; and these properties in relation to the use and management of soils.

Soil science is the study of soil as a natural resource on the surface of the earth including soil formation, classification and mapping ; physical, chemical, biological, and fertility properties of soils ; and these properties in relation to the use and management of soils.

Soil life is severely damaged, which results in a hard layer of earth underneath the root zone on the heath at a depth of about.

* Soil or earth, the material in which plants grow ( usually brown )

** Soil conservation, management strategies for prevention of soil being eroded from the earth ’ s surface or becoming chemically altered

Soil plays a different role in the burrow nest ; here, the eggs and young — and in most cases the incubating parent bird — are sheltered under the earth.

The IUSS has contributed to the brochure International Year of Planet Earth ’ s brochure “ Soil – earth ’ s living skin ”, that has been translated in several languages and is widely distributed.

* Rotovator, an alternative name for a rotary tiller, a machine for digging earth, Rotary Tiller prepares the Soil for Sowing-5 Times faster than tradition System

Soil crusts are important members of desert ecosystems and contribute to the well-being of other plants by stabilizing sand and dirt, promoting moisture retention, and fixing atmospheric nitrogen.

* ASTM, 2004, " Standard Method of Deep Quasi-Static Cone and Friction-Cone Penetration Tests of Soil "; ASTM Standard D 3441, ASTM International, West Conshohocken, PA, 7 pp.