plowing horizon

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• Soil Horizon letter designations — ▪ Table Soil horizon letter designations See as table: Base symbols for surface horizons O organic horizon containing litter and decomposed organic matter A mineral horizon darkened by humus accumulation       Base symbols for subsurface horizons …   Universalium

• Podzol — Podsol, Spodosol a stagnopodzol in upland Wales Used in: WRB, USDA soil taxonomy, others …   Wikipedia

• Podsol — In soil science, Podsol (also spelled Podzol, or known as Spodosol) are the typical soils of coniferous, or Boreal forests. They are also the typical soils of eucalypt forests and heathlands in southern Australia. The name is Russian for under… …   Wikipedia

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• Duripan — A duripan is a diagnostic soil horizon of the USDA soil taxonomy that is cemented by illuvial silica into a subsurface hardpan. Similar to a fragipan, petrocalcic horizon and petrogypsic horizon, it is firmly cemented and restricts soil… …   Wikipedia

• calendar — calendrical /keuh len dri keuhl/, calendric, calendarial /kal euhn dair ee euhl/, calendarian, calendaric, adj. /kal euhn deuhr/, n. 1. a table or register with the days of each month and week in a year: He marked the date on his calendar. 2. any …   Universalium

• china — /chuy neuh/, n. 1. a translucent ceramic material, biscuit fired at a high temperature, its glaze fired at a low temperature. 2. any porcelain ware. 3. plates, cups, saucers, etc., collectively. 4. figurines made of porcelain or ceramic material …   Universalium

• China — /chuy neuh/, n. 1. People s Republic of, a country in E Asia. 1,221,591,778; 3,691,502 sq. mi. (9,560,990 sq. km). Cap.: Beijing. 2. Republic of. Also called Nationalist China. a republic consisting mainly of the island of Taiwan off the SE coast …   Universalium

• Africa — /af ri keuh/, n. 1. a continent S of Europe and between the Atlantic and Indian oceans. 551,000,000; ab. 11,700,000 sq. mi. (30,303,000 sq. km). adj. 2. African. * * * I Second largest continent on Earth. It is bounded by the Mediterranean Sea,… …   Universalium

• Egypt — • Provides information on history, religion, and literature Catholic Encyclopedia. Kevin Knight. 2006. Egypt     Egypt     † …   Catholic encyclopedia

• Soils retrogression and degradation — in the French school of pedology are two regressive evolution processes associated with the loss of equilibrium of a stable soil. Retrogression is primarily due to erosion and corresponds to a phenomenon where succession reverts back to pioneer… …   Wikipedia