To investigate the use of grid soil mapping to measure a variety of soil chemistry properties, specifically soil pH, exchangeable cations and soil phosphorus (P), and explored the potential relationships between different soil characteristics across individual paddocks.

• Soil sampling to understand in-paddock variations of pH, exchangeable cations and phosphorus (P) provides growers with an understanding of key soil constraints and their distribution, supporting more targeted amelioration strategies.
• For a case study property near Tocumwal, Victoria the variable-rate application (VRA) of lime, gypsum, phosphorus and potentially magnesium (Mg) was well supported by soil test results.
• Measurement of pH, exchangeable cations and phosphorus parameters across 280 paddocks showed a generally poor correlation between these components suggesting different management zones are required to address different soil constraints.