Soil slotting to ameliorate subsoil limitations to crop production first presented in 1991
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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

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


What is slotting
What is slotting production

  • Segmental deep loosening technique to reduce recompaction

  • Deep mixing and placement of ameliorants



Slot formation
Slot formation production

after Jayawardane et al. 1995


Commercial slotter
Commercial slotter production


Slot configuration
Slot configuration production


Water logging
Water logging production

Not slotted

Slotted


Air filled porosity
Air filled porosity production

after Jayawardane and Chan, 1994


Ameliorant mixing
Ameliorant production mixing

after Jayawardane et al., 1995


Recompaction
Recompaction production

after Blackwell et al. 1989.

(cm)


Root growth in acid soils
Root growth in acid soils production

Undisturbed

subsoil

Fully ameliorated slot




Slotting vs deep ripping
Slotting productionvs deep ripping


Is there a future in soil slotting
Is there a future in soil slotting? production

  • 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


Stress fissures along slot wall
Stress fissures along slot wall production

undisturbed

Slot