Salinization

People need food. Desert soils are generally very fertile, as there is very little water to wash out the nutrients. In order for most food crops to grow (wheat, corn, barley, etc.), irrigation is needed. Irrigation has the capacity to increase crop yields over 10 times compared to fields without irrigation. Without proper management, the soils can become a salty mess, incapable of crop production.

 

salinity in a field in Mexico
Poor soil that is damaged by accumulated salt content from poor quality irrigation water near Mexicali, Mexico. May 1972. Credit: Charles O'Rear. US Archives 412-DA-6597

Where does the salt come from?

 

Flood irrigated field
Basin flood irrigation on wheat. Yuma, Az. Credit: Jeff Vanuga, USDA-NRCS

Why is salt a problem?

Changing Groundwater Tables

Different Types of Salinity

 

salt uptake on a fencepost
Salt-affected soils are visible on rangeland in Colorado. Salts dissolved from the soil accumulate at the soil surface and are deposited on the ground and at the base of the fence post. Credit: USDA NRCS

Fixing Salinity

 

Drip irrigation
Drip irrigation can reduce evaporation.

 

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