• To encourage Mark Stoeckel, Paringa-Murtho grain grower, to experiment with different rates and types of nitrogen fertiliser on his paddock.
• To use precision yield mapping to provide an accurate analysis of the trial.
• To demonstrate potential benefits of Precision Agriculture technologies, especially variable rate to emonstrate reduced risk and maximised return in continuous cropping systems.
• To demonstrate and extend the benefits of precision agriculture technology to SA Mallee growers.

Variable rate fertiliser application has a real and profitable place in the Mallee when combined with good paddock science. The precision technology gives the ability to examine the yield data for many effects including other possible influencing factors such as elevation, slope aspect or orientation to the sun, and probably many others. Grain yield was recorded continuously during harvest and logged against GPS position. From the resultant yield map it was possible to isolate treatment strips and EM38 zones within these strips and determine the yield for individual strips and therefore treatments, and also where these treatments intersect with the paddock zones. Trial was statistically analysed and Table 1 above shows there was no significant difference between treatments.