White-alkali

white alkali

noun
1.
Agriculture. a whitish layer of mineral salts, especially sodium sulfate, sodium chloride, and magnesium sulfate, often occurring on top of soils where rainfall is low.
2.
refined soda ash.
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World English Dictionary
white alkali
 
n
1.  refined sodium carbonate
2.  any of several mineral salts, esp sodium sulphate, sodium chloride, and magnesium sulphate, that often appear on the surface of soils as a whitish layer in dry conditions

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