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Item 9 pacific resolan aspac_case studies

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Soils FAO-GSP
Soils FAO-GSP

ASPAC | Pacific network of soil laboratories: 1st meeting. Brisbane, Australia, 17 - 18 October 2019. Presenters: De Hayr, Suvannang, Moody

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Items 16 & 17 What do soil analyses tell us? Rob De Hayr (ASPAC) Nopmanee Suvannang (GLOSOLAN) Phil Moody (University of Queensland)
Do you remember your lab analysing (0-15 cm) samples KI and LB in the SEALNET Inter-Laboratory Proficiency Program? LBKI
Method KI LB pH1:2.5 water 5.4 7.8 Walkley-Black org C (%) 0.4 2.7 Total org C (%) 0.4 3.2 Exchangeable K (mg/kg) 16 401 Bray 1-P (mg/kg) 4 8.9 Bray 2-P (mg/kg) 3 68.7 Olsen-P (mg/kg) 2.3 10.5 These are the results (median)
Discussion of what general conclusions each lab could make about the results
So what can we make of the results? (What can we tell our clients?) KI LB Property Implications Property Implications Moderately acidic Liming required for acid-sensitive crops Slightly alkaline Nil Low organic carbon Retain crop residues Add compost/manure High organic carbon Nil Low potassium Apply low rates of potash frequently and monitor soil K over time Adequate potassium Replace potash removed in harvested product Low phosphorus Apply phosphorus at crop specific rate and monitor soil P over time Adequate phosphorus for most crops Adequate phosphorus- monitor soil P over time
Discussion of what management strategies could be inferred from the additional information
Other information KI LB Landscape position River flat Hillslope Colour Brown Black CEC (cmol/kg) 2.7 43 Clay (%) Silt (%) 9, 29 53, 20 Land use Rice Upland rice/sugarcane What more advice could we provide with some extra information?
Discussion of what other management strategies could be inferred from the data
KI LB Property Implications Property Implications River flat Flooding risk, Denitrification risk Hillslope Erosion risk, Denitrification risk if soil is saturated, Volatilisation risk from surface applied urea Low CEC Apply fertiliser often at low rates High CEC Nil Low clay, high silt Risk of compaction, Hard-setting High clay May be difficult to cultivate, Risk of compaction if tilled when wet So what can we make of the results? (What can we tell our clients?)
In summary Much information can be obtained from a few simple soil analyses- they are not just numbers! When possible, provide your client with interpretation of the requested analyses - your lab is not just a factory producing numbers, but a professional scientific institution!
Thanks for your attention

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Item 9 pacific resolan aspac_case studies

  • 1. Items 16 & 17 What do soil analyses tell us? Rob De Hayr (ASPAC) Nopmanee Suvannang (GLOSOLAN) Phil Moody (University of Queensland)
  • 2. Do you remember your lab analysing (0-15 cm) samples KI and LB in the SEALNET Inter-Laboratory Proficiency Program? LBKI
  • 3. Method KI LB pH1:2.5 water 5.4 7.8 Walkley-Black org C (%) 0.4 2.7 Total org C (%) 0.4 3.2 Exchangeable K (mg/kg) 16 401 Bray 1-P (mg/kg) 4 8.9 Bray 2-P (mg/kg) 3 68.7 Olsen-P (mg/kg) 2.3 10.5 These are the results (median)
  • 4. Discussion of what general conclusions each lab could make about the results
  • 5. So what can we make of the results? (What can we tell our clients?) KI LB Property Implications Property Implications Moderately acidic Liming required for acid-sensitive crops Slightly alkaline Nil Low organic carbon Retain crop residues Add compost/manure High organic carbon Nil Low potassium Apply low rates of potash frequently and monitor soil K over time Adequate potassium Replace potash removed in harvested product Low phosphorus Apply phosphorus at crop specific rate and monitor soil P over time Adequate phosphorus for most crops Adequate phosphorus- monitor soil P over time
  • 6. Discussion of what management strategies could be inferred from the additional information
  • 7. Other information KI LB Landscape position River flat Hillslope Colour Brown Black CEC (cmol/kg) 2.7 43 Clay (%) Silt (%) 9, 29 53, 20 Land use Rice Upland rice/sugarcane What more advice could we provide with some extra information?
  • 8. Discussion of what other management strategies could be inferred from the data
  • 9. KI LB Property Implications Property Implications River flat Flooding risk, Denitrification risk Hillslope Erosion risk, Denitrification risk if soil is saturated, Volatilisation risk from surface applied urea Low CEC Apply fertiliser often at low rates High CEC Nil Low clay, high silt Risk of compaction, Hard-setting High clay May be difficult to cultivate, Risk of compaction if tilled when wet So what can we make of the results? (What can we tell our clients?)
  • 10. In summary Much information can be obtained from a few simple soil analyses- they are not just numbers! When possible, provide your client with interpretation of the requested analyses - your lab is not just a factory producing numbers, but a professional scientific institution!
  • 11. Thanks for your attention