Aglime Fertiliser

Long term lessons from liming soil - Case Study


Courtesy of Aglime Fertiliser

Long term trials have shown continuous cropping under a cereal legume rotation with district practice application of fertiliser N and retention of stubble caused a decrease in soil pH of up to 1.6 units over 14 years. Reduced N inputs can lessen this impact (as can stubble removal) but also decreases yield. At Wagga, the application of lime in combination with phosphorous (P) increased grain yields by almost 100%, whilst stocking rates increased by 25% after six years. Soil pH initially increased from pH 4.0 to 5.5 after application of 3.7 t/ha lime, but subsequently decreased back to 5.0 over the next six years.

  • High initial lime rates will improve soil pH more rapidly and allow excess lime to move deeper into the profile addressing subsoil acidification.
  • Maintenance lime is required to maintain changes in soil pH.
  • Liming may increase N leaching.
  • P application is more efficient.
  • Excessive N application and leaching of nitrate is likely to accelerate the decline in soil pH.

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