Soil Science & Management, 4E

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Presentation transcript:

Soil Science & Management, 4E Chapter 6 Organic Matter T6-1 Soil Science & Management, 4E

Soil Science & Management, 4E Objectives Explain what organic matter is and how it forms Describe what organic matter does in the soil List several ways to maintain soil organic matter Discuss the problem of nitrogen tie-up Define organic soil, listing uses and problems T6-2 Soil Science & Management, 4E

Soil Science & Management, 4E Terms to Know Amino acid Carbon-nitrogen ratio Cellulose Colloids Compost Cover crop Fibric Green manure Hemic Hemicellulose Humification Humus Labile Lignin Muck Nitrogen depression period Organic matter T6-3 Soil Science & Management, 4E

Soil Science & Management, 4E Terms to Know Organic soils Peat Recalcitrant Proteins Sapric Starch Subsidence T6-4 Soil Science & Management, 4E

The Nature of Organic Matter Chemical makeup of organic matter Figure 6-2 T6-5 Soil Science & Management, 4E

Soil Science & Management, 4E The Process of Decay Factors affecting organic matter T6-6 Soil Science & Management, 4E

Functions of Organic Matter Nutrient and water storage Nutrient availability Soil aggregation Preventing erosion Undesirable effects T6-7 Soil Science & Management, 4E

Maintaining Soil Matter Conservation tillage Crop residues Green manuring and cover cropping Crop rotation Organic matter additions Mulches Increasing soil water Maximum cropping T6-8 Soil Science & Management, 4E

Nitrogen Tie-up and Composting Figure 6-7 T6-9 Soil Science & Management, 4E

Nitrogen Tie-up and Composting Figure 6-8 T6-10 Soil Science & Management, 4E

Nitrogen Tie-up and Composting Figure 6-9 T6-11 Soil Science & Management, 4E

Soil Science & Management, 4E Organic Soils Horticultural peat Figure 6-11 T6-12 Soil Science & Management, 4E

Organic Matter and Global Climate Soil organic matter affects ecosystems, growers, and global climate T6-13 Soil Science & Management, 4E

Soil Science & Management, 4E Summary Amount of organic matter depends on: Vegetation Climate Soil texture Soil drainage Tillage Improves soil Preserve organic matter T6-14 Soil Science & Management, 4E