15-2 Crops and Soil
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Transcript of 15-2 Crops and Soil
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15-2 Crops and Soil
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A. Fertile Soil: The Living Earth
• 1. Soil must be fertile to produce healthy plants.
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A. Fertile Soil: The Living Earth
• 2. Topsoil, the surface layer of soil, is where plant roots grow.
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A. Fertile Soil: The Living Earth
• 3. Soil primarily comes from the weathering of rocks.– Mechanical– Chemical
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B. Soil Erosion: A Global Problem
• 1. Erosion is the movement of rock, soil, and sand by wind and water.
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B. Soil Erosion: A Global Problem
• 2. U.S. topsoil has been eroded by 50% in the last 200 years.
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B. Soil Erosion: A Global Problem
• 3. Farming increases the rate of erosion.
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C. Land Degradation
• 1. Occurs when human processes or natural activity damage the land to the extent that the ecosystem can not be supported.
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C. Land Degradation
• 2. Leads to desertification, where land in arid (lacking moisture) areas becomes even more desert like.
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D. Soil Conservation• 1. To prevent down hill erosion:– Soil-retaining terraces– Contour plowing– No-till farming
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E. Enriching the Soil
• 1. Through the use of manures and fertilizers.
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E. Enriching the Soil
• 2. Compost uses partly decomposed organic material.
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F. Salinization
• 1. accumulation of salts in the soil.
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G. Pest Control
• 1. Pesticides are chemicals used to kill insects, weeds, and other crop pests.
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G. Pest Control• 2. A negative is that pests can develop
resistance.
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G. Pest Control
• 3. There are human health concerns such as cancer risks and nervous system disorders.
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G. Pest Control
• 4. Persistent pesticides do not break down and accumulate in the soil and water.
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H. Biological Pest Control
• 1. form of pest management that uses living organisms.
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H. Biological Pest Control• 2. Pathogens, such as bacteria, may be used to
infect insect pests.
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H. Biological Pest Control
• 3. Plant defenses are incorporated into plants, such as tomatoes, so that they are unaffected by certain fungi, worms, or viruses.
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H. Biological Pest Control
• 4. Natural pesticides produced by plants that are biodegradable.
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H. Biological Pest Control• 5. Disrupting insect breeding by use of
pheromones or chemicals that disrupt development. Ex: Fleas
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I. Integrated Pest Management
• 1. uses a mixture of techniques to control pests and cause the least amount of economic damage.
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J. Engineering a Better Crop
• 1. Genetic engineering is a technique in which genetic material in a living cell is modified for medical or industrial use.