alkali+soils

См. также в других словарях:

• Alkali soils — Alkali, or alkaline, 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 (in… …   Wikipedia

• alkali soils — soil located in arid regions which contains minerals …   English contemporary dictionary

• alkali sacaton — noun : a dropseed (Sporobolus airoides) that is abundant in dry alkali soils especially in the southern United States …   Useful english dictionary

• 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… …   The Collaborative International Dictionary of English

• Alkali — Al ka*li (?; 277), n.; pl. {Alkalis} or {Alkalies}. [F. alcali, ultimately fr. Ar. alqal[=i] ashes of the plant saltwort, fr. qalay to roast in a pan, fry.] 1. Soda ash; caustic soda, caustic potash, etc. [1913 Webster] 2. (Chem.) One of a class… …   The Collaborative International Dictionary of English

• alkali — (n.) late 14c., soda ash, from M.L. alkali, from Arabic al qaliy the ashes, burnt ashes (of saltwort, a plant growing in alkaline soils), from qala to roast in a pan. The modern chemistry sense is from 1813 …   Etymology dictionary

• alkali — /al keuh luy /, n., pl. alkalis, alkalies, adj. n. 1. Chem. a. any of various bases, the hydroxides of the alkali metals and of ammonium, that neutralize acids to form salts and turn red litmus paper blue. b. any of various other more or less… …   Universalium

• alkali — noun (plural lies or lis) Etymology: Middle English, from Medieval Latin, from Arabic al qili the ashes of the plant saltwort Date: 14th century 1. a soluble salt obtained from the ashes of plants and consisting largely of potassium or sodium… …   New Collegiate Dictionary

• alkali — al•ka•li [[t]ˈæl kəˌlaɪ[/t]] n. pl. lis, lies, adj. 1) chem. a) any of various bases, the hydroxides of the alkali metals and of ammonium, that neutralize acids to form salts and turn red litmus paper blue b) any of various other active bases, as …   From formal English to slang

• alkali — /ˈælkəlaɪ / (say alkuhluy) noun (plural alkalis or alkalies) 1. Chemistry a. any of various bases, the hydroxides of the alkali metals and of ammonium, which neutralise acids to form salts and turn red litmus paper blue. b. any of various other… …  

• alkali soil — /ˌælkəlaɪ ˈsɔɪl/ (say .alkuhluy soyl) noun any of various soils in poorly drained or arid regions, containing a large amount of soluble mineral salts (chiefly of sodium) which in dry weather appear on the surface as a (usually white) crust or… …