EESA01H3 Lecture : SOIL.docx

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30 Apr 2012
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Soil: cation exchange: process by which plant"s roots donate hydrogen ions to the soil in exchange for cations. (positively charged ions) such as those of calcium, magnesium, & potassium which plants use as nutrients. The soil particles then replenish these cations by exchange with soil water. Cation exchange capacity: expresses a soil"s ability to hold cations (preventing from leaching & making them available to plants). As, soils ph becomes lower the cation exchange capacity diminishes, nutrients leach away. Soil may instead supply plants with harmful aluminum ions. (acidic ppt. can harm soils & plant communities). As population & consumption increase, soils are being degraded. With rise in population, we need to either change our diet plans or increase agricultural productivity. We need to do it sustainably: extensification: increase in resource productivity by bringing more land in production. Now days, grassland have turned into desert. Poor agricultural practices have resulted countless fertile soil to be blown & washed away.

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