1. Agriculture and Soil
Unit 9: Food
April 22, 2009
Sanders

2. Homework Questions Describe fertile soil.
Describe methods to prevent soil erosion.
Explain how irrigation can cause salinization.

3. Farming Basic methods of farming. People and animals plowed the field.
Plowing
Fertilization
Irrigation
Pest control
People and animals plowed the field.
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4. Modern Farming Machinery is now used.
Plowed
Harvest
Synthetic fertilizer made in factories.
Sprinkler and drip irrigation systems.
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5. Fertile Soil
Soils is a combination of sediment from weathered rock and humus.
Soil in which most plants are healthy and able to grow rapidly is called fertile soil.
Healthy soil is full of organisms.
October 14, 2019
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6. Top Soil Erosion
Erosion is the wearing away of topsoil by wind and water.
It is estimated that 11% of the last 45 years.
Certain farming practices contribute to erosion.
Easily blown away
Washed away by rain
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7. Dust Bowl
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8. Desertification
Desertification occurs to the point where soils is deteriorated.
Overgrazing leads to grass being consumed.
Increased population promotes greater the demand for grazing.
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9. Desertification
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10. Soil Conservation Contour plowing is plowing in the shape of the land.
Prevents soil wash away
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11. Sustainable Agriculture
Low input farming farms without much
Energy
Pesticides
Fertilizers
Water
Organic farming saves money by reducing expenses.
October 14, 2019
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12. Preventing Salinization
Accumulation of salt in soil is salination.
Soil irrigated with salty water cannot grow plants well.
Soil-tolerant plants remove salt.
October 14, 2019
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