alkali soils
soil located in arid regions which contains minerals | ||||
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Alkali soil Definition from Science & Technology Dictionaries & Glossaries
| Agricultural Glossary/yigini2004 |
Alkali soil
Common term for a soil with a pH of 8.5 or higher or with a high percentage of exchangeable sodium relative to other exchangeable cations (>15%). Also called sodic and saline-sodic soils
Common term for a soil with a pH of 8.5 or higher or with a high percentage of exchangeable sodium relative to other exchangeable cations (>15%). Also called sodic and saline-sodic soils
Alkali soil Definition from Language, Idioms & Slang Dictionaries & Glossaries
| hEnglish - advanced version |
alkali soil
alkali soil
\alkali soil\ any one of various soils found in arid and semiarid regions, containing an unusual amount of soluble mineral salts which effloresce in the form of a powder or crust (usually white) in dry weather following rains or irrigation. the basis of these salts is mainly soda with a smaller amount of potash, and usually a little lime and magnesia. two main classes of alkali are commonly distinguished: black alkali, which may be any alkaline carbonate, but which practically consists of sodium carbonate (sal soda), which is highly corrosive and destructive to vegetation; and white alkali, characterized by the presence of sodium sulphate (glauber's salt), which is less injurious to vegetation. black alkali is so called because water containing it dissolves humus, forming a dark-colored solution which, when it collects in puddles and evaporates, produces characteristic black spots.
alkali soil
\alkali soil\ any one of various soils found in arid and semiarid regions, containing an unusual amount of soluble mineral salts which effloresce in the form of a powder or crust (usually white) in dry weather following rains or irrigation. the basis of these salts is mainly soda with a smaller amount of potash, and usually a little lime and magnesia. two main classes of alkali are commonly distinguished: black alkali, which may be any alkaline carbonate, but which practically consists of sodium carbonate (sal soda), which is highly corrosive and destructive to vegetation; and white alkali, characterized by the presence of sodium sulphate (glauber's salt), which is less injurious to vegetation. black alkali is so called because water containing it dissolves humus, forming a dark-colored solution which, when it collects in puddles and evaporates, produces characteristic black spots.
Alkali soil Definition from Encyclopedia Dictionaries & Glossaries
| Wikipedia English - The Free Encyclopedia |
Alkali soils
Alkali soils are clay soils with a relatively high exchangeable sodium percentage, a relative high pH (> 9), a poor soil structure and a low infiltration capacity. Often they have a hard calcareous layer at 0.5 to 1 m. depth.
Akali soils are usually not saline, i.e. the total amount of soluble salts, especially sodium chlorides, is not excessive (ECe < 4 to 8 dS/m). Alkali soils are also called sodic soils. This does not differentiate alkali soils from saline soils. Saline soils have a high sodicity (i.e. a high sodium content that may be higher than that of alkali soils), but they are not alkali soils and have usually a good infiltration capacity.
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