The irrigated wheat crop in Egypt has a salt tolerance of ECe=7.6 dS/m beyond which the yield declines. The data were collected in farmers' fields.[1]
Salt tolerance of crops is the maximum salt level a crop tolerates without losing its productivity while it is affected negatively at higher levels. The salt level is often taken as the soil salinity or the salinity of the irrigation water.
Salt tolerance is of importance in irrigated lands in (semi)arid regions where the soil salinity problem can be extensive as a result of the salinization occurring here. It concerns hundreds of millions of hectares.[2] A regional distribution of the 3,230,000 km2 of saline land worldwide is shown in salt affected area based on the FAO/UNESCO Soil Map of the World.
Additionally, in areas where sprinkler irrigation is practiced, salty sprinkler water can cause considerable damage by leaf burning, whether the soil is saline or not.[3]
^H.J. Nijland and S. El Guindy, Crop yields, watertable depth and soil salinity in the Nile Delta, Egypt. In: Annual report 1983, International Institute for Land Reclamation and Improvement (ILRI), Wageningen, The Netherlands. [1]
^R.Brinkman, 1980. Saline and sodic soils. In: Land reclamation and water management, p. 62–68. International Institute for Land Reclamation and Improvement (ILRI), Wageningen, The Netherlands.
^Government of Western Australia, Department of Agriculture and Food. Water salinity and plant irrigation. [2]
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