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| Description: Cation exchange = process that allows plants to gain nutrients Negatively charged soils hold cations of calcium, magnesium, and potassium Cation exchange capacity = a soil’s ability to hold cations, preventing them from leaching, thereby increasing their availability to plants A useful measure of soil fertility Greatest in fine soils Many pollutants are positively charged, notably heavy metals such as cadmium, lead, and mercury These cations are attracted to negatively charged clay and humus particles in soil Make it difficult to remediate soil Also means they are held in soil instead of being released into aquatic ecosystems Picture Stats: Views: 279 Filesize: 59.73kB Height: 579 Width: 1000 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=35721 |