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

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Presentation transcript:

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

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

Farming Basic methods of farming. People and animals plowed the field. Plowing Fertilization Irrigation Pest control People and animals plowed the field. October 14, 2019 Sanders

Modern Farming Machinery is now used. Plowed Harvest Synthetic fertilizer made in factories. Sprinkler and drip irrigation systems. October 14, 2019 Sanders

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 Sanders

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 October 14, 2019 Sanders

Dust Bowl October 14, 2019 Sanders

Desertification Desertification occurs to the point where soils is deteriorated. Overgrazing leads to grass being consumed. Increased population promotes greater the demand for grazing. October 14, 2019 Sanders

Desertification October 14, 2019 Sanders

Soil Conservation Contour plowing is plowing in the shape of the land. Prevents soil wash away October 14, 2019 Sanders

Sustainable Agriculture Low input farming farms without much Energy Pesticides Fertilizers Water Organic farming saves money by reducing expenses. October 14, 2019 Sanders

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 Sanders