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Published byEdgar Fox Modified over 9 years ago
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Soils: One of Our Natural Resources!
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Some call it dirt…..But it is Soil !!! Soil is made of loose, broken down rock and organic material.
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Quick review: what is in soil? Soil life like bacteria, earthworms, and moles as well as air and water.
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Did you know? It takes hundreds sometimes thousands of years to form one inch of soil from the rock below.
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Only the top few centimeters of soil are good for growing plants.
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This is why why we have to take care of our soil! Soil conservation Soil conservation is important!
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What would happen to land based life as we know it, if there was no soil layer?
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World soil conditions Soils are becoming degraded in many regions. Figure 8.1a
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Causes of soil degradation Most soil degradation is caused by: – livestock overgrazing – deforestation – erosion on cropland agriculture – soil pollution Figure 8.2
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Soil erosion
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What if soil is lost? Land can turn into a desert, nothing can grow and there can be famine
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What can be done? Soil conservation – preventing soil loss How – use less machinery on the soil, less fertilizer, etc.
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Crop rotation Figure 8.16a
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Contour farming Figure 8.16b
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Intercropping Figure 8.16c
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(c) Alley cropping
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Terracing Figure 8.16d
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Shelterbelts Figure 8.16e
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Conservation tillage Figure 8.16f
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