Alkali, or alkaline, soils are clay soils with 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 India this layer is called 'kankar'). Alkali soils owe their unfavorable physico-chemical properties mainly to the dominating presence of sodium carbonate which causes the soil to swell. They derive their name from the alkali metal group of elements to which the sodium belongs and that can induce basicity.

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  • Alkali, or alkaline, soils are clay soils with 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 India this layer is called 'kankar'). Alkali soils owe their unfavorable physico-chemical properties mainly to the dominating presence of sodium carbonate which causes the soil to swell. They derive their name from the alkali metal group of elements to which the sodium belongs and that can induce basicity. Sometimes these soils are also referred to as (alkaline) sodic soils. See also Alkaline#Confusion between alkali and base
  • 盐碱地指的是那些盐分含量高，pH大于9，难以生长植物尤其是农作物的土壤。根据所含盐分和碱份的多少，还可进一步分为轻度(0.1%～0.25%)、中度（0.25%～0.5%）、重度盐碱地（0.5%～0.6%）。
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  • Alkali, or alkaline, soils are clay soils with 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 India this layer is called 'kankar'). Alkali soils owe their unfavorable physico-chemical properties mainly to the dominating presence of sodium carbonate which causes the soil to swell. They derive their name from the alkali metal group of elements to which the sodium belongs and that can induce basicity.
  • 盐碱地指的是那些盐分含量高，pH大于9，难以生长植物尤其是农作物的土壤。根据所含盐分和碱份的多少，还可进一步分为轻度(0.1%～0.25%)、中度（0.25%～0.5%）、重度盐碱地（0.5%～0.6%）。
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  • Alkali soils
  • 盐碱地
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