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Managing the Soil Section 4.2.

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Presentation on theme: "Managing the Soil Section 4.2."— Presentation transcript:

1 Managing the Soil Section 4.2

2 Managing Soil Nutrients
The nutrients plants require are found in the soil Potassium Nitrogen Phosphorous As plants grow they take in these nutrients As plants are harvested these nutrients are removed from the ecosystem

3 Fertilizers Natural: Synthetic: From plant/animal waste Compost Manure
Manufactured by chemical processes Farmers started using them in 1960s and saw increased crop yields

4 Environmental Impacts of Fertilizers
Synthetic fertilizers are very concentrated so they change the community of soil organisms Can leach out of the soil and enter the water system.

5 Algal Blooms Fertilizer in water systems causes an increase algae, which then dies and decomposes The bacteria involved in decomposition use up a lot of dissolved oxygen which kills fish and other organisms

6 Water in the Soil Farmers often use irrigation to add water to crops
If there is too much water then drainage must be added

7 Soil Compaction If soil is compacted it has decreased oxygen levels and water will have difficulty passing through.

8 Today’s Task Pg. 128 #3, 4, 6, 8 Read Black Gold – page 129


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