Effect of Compost Application and Mulch on Soil Physical and Hydraulic Properties - PowerPoint PPT Presentation

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Effect of Compost Application and Mulch on Soil Physical and Hydraulic Properties

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Title: Organic Waste-based Soil Amendments Author: Andrew Chang Last modified by: Gwyn Dixon Created Date: 8/22/1999 9:11:22 PM Document presentation format – PowerPoint PPT presentation

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Title: Effect of Compost Application and Mulch on Soil Physical and Hydraulic Properties


1
Effect of Compost Application and Mulch on Soil
Physical and Hydraulic Properties
  • Laosheng Wu, Ph.D.
  • Department of Environmental Sciences
  • UCCE-Riverside

2
Organic Soil Amendments
  • Waste-based products
  • Barks, shavings and chips, and saw dusts
  • Peat moss
  • Animal manure
  • Sewage sludge
  • Municipal solid waste composts - yard wastes

3
Benefits
  • Fertility
  • Disease weed suppression
  • Water management

4
Fertility
  • Increase soil reserves of K, Zn, and Fe under
    serial applications
  • Increase soil organic matter with maintenance
    applications of at least 5 ton/year
  • Long term nutrient availability in potting soil
    applications

5
Yard Wastes
  • Need outlets for these products
  • Land application - a logical solution
  • Heavy promotion eco-correctness
  • Readily assimilated into the soil
  • Produced in close proximity

6
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7
Yard Wastes
8
Soil Conditioner
  • Incorporated to alter soil properties for a
    specific use
  • Bulk density
  • Water holding capacity
  • Permeability
  • Modulus of rupture (cohesion)
  • Nutrients

9
Reduce Bulk Density(Chang Et Al., 1983)
10
Improve With Rate(Chang Et Al., 1983)
11
Improved Water Infiltration(Reitemeier and
Christiansen, 1946)
12
Improve Soil Permeability(Chang et al., 1983)
13
Improve with Rate(Chang et al, 1983)
14
Soil Structure(Pagliai et al., 1993)
  • Increased soil porosity
  • Formation of micro-aggregates increased
    elongated micro-pores
  • Expanded the 50 - 500 mm fraction
  • Effects increased with application rates

15
Increased Aggregate Stability (Martens
Frankenberger, 1992)
16
Mulch
  • Surface cover for soil around plants
  • Organic barks, wood chips, leaves, pine needles,
    grass clippings, sawdust, rice hulls, compost
    (sewage sludge, animal manure, etc.)
  • Inorganic rocks, plastics, synthetic fabrics

17
Benefits of Mulch
  • Aesthetics
  • Preserve soil moisture
  • Moderate soil temperature
  • Reduce weed
  • Improve plant performance
  • Prevent erosion and soil compaction

18
Modulate Soil Temperature(Bushnell and Welton,
1931)
19
Preserve Soil Moisture(Bushnell and Welton, 1931)
20
Better Plant Performance(Bushnell and Welton,
1931)
21
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22
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23
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24
Soil Mix
  • Formulated plant growth media
  • Mixture of organic and inorganic ingredients
  • Selected for physical properties or special
    nutritional needs
  • Used for potted plants, landscape plantings, golf
    greens

25
Property of Soil Mix(Richards et al., 1964)
26
Property of Soil Mix(Richards et al., 1964)
27
Property of Soil Mix(Richards et al., 1964)
28
Sewage Sludge(Chang et al., 1983)
29
Water Holding Capacity(Chang et al, 1983)
30
Sewage Sludge(Chang et al., 1983)
31
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32
Summary
  • Advantages
  • Improve soil structure (incorporated)
  • Increase water holding capacity (incorporated)
  • Increase infiltration (incorporated)
  • Reduce runoff (mulch)
  • Suppress weeds and diseases (mulch)

33
Summary (Continued)
  • Disadvantages
  • Salinity problem if animal manure and sewage
    sludge application rate is too high
  • Heavy metals accumulation (sewage sludge)
  • Continuous application may required to maintain
    improved infiltration and water retention
  • Cost depends on processing, packaging,
    transportation
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