t15-1 soil science & management, 4e chapter 15 organic amendments
TRANSCRIPT
T15-1 Soil Science & Management, 4E
Chapter 15
Organic Amendments
T15-2 Soil Science & Management, 4E
Objectives
• Explain the benefits of organic amendments
• Describe how to use animal manure• Describe how to use biosolids• Explain large-scale composting• List environmental side effects of fertilizers
and amendments
T15-3 Soil Science & Management, 4E
Terms to Know
• Best Management Practices• Biosolids• Eutrophication• Hypoxia• Mesophilic• Organic amendment• Sewage sludge• Thermophilic
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Animal Manure
Figure 15-1
• Benefits of manure
T15-5 Soil Science & Management, 4E
Animal Manure
• Problems of manure
• Content of manure
Figure 15-2
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Animal Manure
• Nutrient losses from manure
Figure 15-3
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Animal Manure
• Handling manure
Figure 15-4
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Animal Manure
• Handling manure
• Best Management Practices
Figure 15-7
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Biosolids
• Biosolids problems– Pollutants– Human pathogens– Human vectors– Other problems
• Application guidelines
• Criticism of biosolids
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Compost
Figure 15-12
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• Animal and human health• Eutrophication and hypoxia• Energy costs• Human changes in global nitrogen
cycles• Best Management Practices
Fertilizer and the Environment
T15-12 Soil Science & Management, 4E
Summary
• Manure, biosolids, and compost double benefit– Contain nutrients– Provide organic matter
• Biosolids: recycled “human manure”• Composting reduces C:N ratio• Improper use can harm environment