Both SAR and EC are important attributes of irrigation water. What do these measures indicate? What is the danger of irrigating with water of (a) high SAR and (b) a high EC? (Hint: Remember that irrigation is repeated again and again, and most of the water evaporates.)

Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
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Chapter1: The Study Of Minerals
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Both SAR and EC are important attributes of irrigation water. What do these measures indicate? What is the danger of irrigating with water of (a) high SAR and (b) a high EC? (Hint: Remember that irrigation is repeated again and again, and most of the water evaporates.)

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Sodium Adsorption Ratio (SAR) is used as a quality indicator for using irrigation water. It represents the relative concentrations of sodium cations to calcium and magnesium cations present in the water. Irrigation water with high SAR can lead to the formation of crusting seedbeds, temporary saturation of the soil surface, increase in pH of the soil, increased vulnerability of soils to diseases, pests, and erosion.

 

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