EESA01H3 Lecture Notes - Lecture 7: Selective Breeding, Biological Pest Control, Malathion
9 Nov 2016
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Eesa01h3 f: lecture 7 - agriculture and environmental impacts. Ideal soil: is a loamy mixture with neutral ph that can hold nutrients and is workable. Ideal soils that have good cation exchange capacity can hold nutrients. Loam: a balanced concentration of all 3 textured soil types (clay, silt, sand). Productivity of soil is being increasingly limited due to human influences: Erosion: the moving of arable soils from the surface of the land into terrestrial lands or water bodies where they are no longer used. Usually happens to lands subjected to irrigation. Waterlogging: is when there is too much water. Structural breakdown: losing the workability or aggregation of the soil properties. Nutrient depletion: changes in cation exchange capacities due to erosion, or the leaching of nutrients from acid rain. Erosion is an issue in all climates with all soil types. Most agriculture techniques increase erosion from 10-100% over normal" rates.
