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  2. Topsoil - Wikipedia

    en.wikipedia.org/wiki/Topsoil

    Topsoil is composed of mineral particles and organic matter and usually extends to a depth of 5-10 inches (13–25 cm). Together these make a substrate capable of holding water and air which encourages biological activity. There are generally a high concentration of roots in topsoil since this is where plants obtain most of their vital nutrients.

  3. Structural Soil - Wikipedia

    en.wikipedia.org/wiki/Structural_Soil

    Structural Soil is a medium that can be compacted to pavement design and installation requirements while permitting root growth. It is a mixture of gap-graded gravels (mostly made of crushed stone) and soil (mineral content and organic content). It provides an integrated, root penetrable, high strength pavement system that shifts design away ...

  4. Soil in the United States - Wikipedia

    en.wikipedia.org/wiki/Soil_in_the_United_States

    Each year thousands of sites complete soil contamination cleanup, some by using microbes that “eat up” toxic chemicals in soil, [5] many others by simple excavation and others by soil vapor extraction, air stripping, or solvent extraction, with the choice of method influenced by the nature of the contaminants involved as well as by costs ...

  5. Irrigation - Wikipedia

    en.wikipedia.org/wiki/Irrigation

    Before diversion, the rivers delivered 55km3 of water to the Aral Sea per year, but after, they only delivered 6km3 to the Sea. Because of its reduced inflow, the Aral Sea covered less than half of its original seabed, which made the regional climate more extreme and created airborne salinization, lowering nearby crop yields.

  6. Friant-Kern Canal - Wikipedia

    en.wikipedia.org/wiki/Friant-Kern_Canal

    The Friant-Kern Canal is a 152 mi (245 km) aqueduct managed by the United States Bureau of Reclamation in Central California to convey water to augment irrigation capacity in Fresno, Tulare, and Kern counties. A part of the Central Valley Project, canal construction began in 1949 and was completed in 1951 at a cost of $60.8 million.

  7. Agricultural soil science - Wikipedia

    en.wikipedia.org/wiki/Agricultural_soil_science

    Prior to the development of pedology in the 19th century, agricultural soil science (or edaphology) was the only branch of soil science.The bias of early soil science toward viewing soils only in terms of their agricultural potential continues to define the soil science profession in both academic and popular settings as of 2006.

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