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Soil Slotting to ameliorate subsoil limitations to crop production (first presented in 1991)

Soil Slotting to ameliorate subsoil limitations to crop production (first presented in 1991). N. S. Jayawardane , ex CSIRO, Division of Land and Water, GPO Box 1666, Canberra, ACT 2601, Australia. G. Kirchhof*, ex NSW Agriculture, PMB 944, Tamworth 2340, Australia. gk@mpx.com.au

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Soil Slotting to ameliorate subsoil limitations to crop production (first presented in 1991)

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  1. Soil Slotting to ameliorate subsoil limitations to crop production(first presented in 1991) N. S. Jayawardane, ex CSIRO, Division of Land and Water, GPO Box 1666, Canberra, ACT 2601, Australia. G. Kirchhof*, ex NSW Agriculture, PMB 944, Tamworth 2340, Australia. gk@mpx.com.au J. Blackwell, ex CSIRO, Division of Land and Water, PMB 3, Griffith, NSW 2380, Australia. Currently ILWS Charles Sturt University, Wagga

  2. What is slotting • Segmental deep loosening technique to reduce recompaction • Deep mixing and placement of ameliorants

  3. Potential uses of soil slotting

  4. Slot formation after Jayawardane et al. 1995

  5. Commercial slotter

  6. Slot configuration

  7. Water logging Not slotted Slotted

  8. Air filled porosity after Jayawardane and Chan, 1994

  9. Ameliorant mixing after Jayawardane et al., 1995

  10. Recompaction after Blackwell et al. 1989. (cm)

  11. Root growth in acid soils Undisturbed subsoil Fully ameliorated slot

  12. Sludge incorporation

  13. Yield responses to slotting

  14. Slotting vs deep ripping

  15. Is there a future in soil slotting? • Rehabilitation of severely degraded soils • Sludge slotting on forestry lands for sludge disposal • Potential uses currently restricted to high value crops • Adoption of slotting hampered by cost • Potential use for installing a lime-slot around acid-sulphate lands, to neutralise discharge

  16. Stress fissures along slot wall undisturbed Slot

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