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Gypcrust horizons can be up to 5 m (16 ft) thick with a 75–97% gypsum (CaSO 4 ∙2H 2 O) content. The majority of gypsum-rich layers occur where the average annual rainfall is less than 250 mm because gypsum is moderately soluble (c. 2.6 g −1 at 25 °C) and is normally leached out under higher rainfall conditions.
In irrigated agriculture, it may be recommended to: apply gypsum (calcium sulfate) to displace sodium cations with calcium and so reduce ESP or sodicity, avoid rapid wetting, and avoid disturbing soils when too wet or dry. [4]
Other soil conditioner uses: Gypsum reduces aluminium and boron toxicity in acidic soils. It also improves soil structure, water absorption, and aeration. [40] Soil water potential monitoring: a gypsum block can be inserted into the soil, and its electrical resistance can be measured to derive soil moisture. [44]
If you have extensive damage, have your soil tested by the local extension office to determine its salinity. They may recommend applying an amendment like gypsum to help remove sodium. They can ...
Gypsisols in the World Reference Base for Soil Resources (WRB) [1] are soils with substantial secondary accumulation of gypsum (CaSO 4.2H 2 O). They are found in the driest parts of the arid climate zone. In the USDA soil taxonomy they are classified as Gypsids (USDA Soil Taxonomy), in the Russian soil classification they are called Desert ...
More substantial however is the leaching of the contents of phosphogypsum into the water table and consequently soil, exacerbated by the fact that PG is often transported as a slurry. [3] Accumulation of water inside of gypstacks can lead to weakening of the stack structure, a cause of several alarms in the United States.
Water retention curve is the relationship between the water content, θ, and the soil water potential, ψ. The soil moisture curve is characteristic for different types of soil, and is also called the soil moisture characteristic. It is used to predict the soil water storage, water supply to the plants (field capacity) and soil aggregate stability.
The soil matrix is the solid phase of soils, ... Many soil minerals, such as gypsum, carbonates, ... additional terms may apply.