ENSC 315 Lecture Notes - Lecture 6: Sodium Adsorption Ratio, Cation-Exchange Capacity, Sea Spray
1 Feb 2017
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Document Summary
Salinization: process by which water soluble salts accumulate in the soil. 1 billion hectares of salt impacted land on earth. Main issues in middle east, central asia, north africa and australia. Sodic soils: most severe class of salinized soil. Cation exchange capacity: a measure of the total exchangeable cations that a soil absorbs. Strength of adsorption to the exchange complex is higher for higher valence cations. Dispersion: sodium ions are larger and have a lower charge - cause particles to swell and expand. Flocculation: calcium ions are smaller and bind stronger to clay particles causing aggregation. Water - inflating agent: maintains shape and allows growth. Plants must lower their internal osmotic potential - results in: Comes with a cost not as much energy into growing. Costly and intense manual labour and time consuming. Phytotechnologies: application of plants to engineering and science problems. Cl- removal increased 160: highest slat phytoextraction potential, native to ontario.
