RESEARCH & EXTENSION

Increasing Soil Carbon

This project is supported by the Goulburn Broken CMA and the Australian Government’s National Landcare Program aims to assess the potential of applying crop residues to an irrigated soil in order to improve soil carbon.

By improving soil carbon, it is anticipated there will be improvements in soil health, namely improved soil structure through the development of stable soil aggregates.
 
The maize crop grown in 2019/19 demonstrated variable vegetative growth in response to inconsistent soil moisture levels due to the development of patches of non-wetting soil. The demonstration site was expanded in an adjacent paddock to include treatments to overcome non-wetting behaviour.
 
Improvements in soil health will be measured via crop performance and soil analysis.
 
 The treatments include:
  • Stubble (10 t/ha) applied to the soil surface
  • Stubble(10 t/ha) and fertiliser (58 kg N/ha + 22 kg P/ha) applied to the soil surface
  • Stubble(10 t/ha) applied and incorporated
  • Stubble (10 t/ha) and fertiliser (58 kg N/ha + 22 kg P/ha) applied and incorporated
  • Manure (10 t/ha) applied to the soil surface
  • Manure (10 t/ha) applied and incorporated
  • Cultivation only
 
Soil Wetter Demonstration
  • Applied September 9th in crop (faba beans)
  • Aquasil at 30 and 60 l/ha
  • Supawet at 30 and 60 l/ha
  • PAM at 5 and 10 kg/ha