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GGR 107 lecutre 10 - GGR 107 Environment Food and People...

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1 GGR 107 Environment → Food and → People Lecture Sept. 27 th Soil Processes and Management
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2 Soil Processes and Management How people use the land affects climate change and it determines how much food we can produce (These issues now intertwined in the Clean Development Mechanism (CDM) of the Kyoto Protocol)
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3 Deforestation and land-use account for about 20% of greenhouse gas emissions CO 2 from wood burning and released from the disturbed soil
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4 CH 4 (methane) from animal wastes N 2 O (nitrous oxide) from fertiliser
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5 Mali, West Africa
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6 How much can a given farming system produce for a farming family and for the market?
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7 Soil Processes and Management How much can a given farming system produce for a farming family and for the market?
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8 Soil Processes and Management What are the factors that determine whether an agricultural system is productive and sustainable? Nature - water, drainage - temperature - nutrients in the soil
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9 Soil Processes and Management Human inputs - labour - additional nutrients e.g. animal manure - improved drainage - additional water - irrigation
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10 What’s in a sample of soil?
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