Practising precision I: A basis for making precision pay

Hazel McInerney1 Jon Medway2 and Peter McInerney1

1 3D-Ag Pty Ltd – 150 Dukes Road, Wagga Wagga, NSW, 2650,, 
Terrabyte Services Pty Ltd – 21 Turner Street, Wagga Wagga, NSW, 2650,


PIP (Precision in Practice) is a new tool enabling farmers to accurately and cost effectively identify management zones within paddocks or management units.  PIP is a two phase process with this paper addressing Phase 1.  PIP begins with developing an accurate set of farm maps, including total area, arable area and elevation.  Onto this base, historic satellite imagery is used to generate NDVI values and spatial statistics used to identify areas of difference (zones).  These are verified by in-field measurement and farmer feedback.  Phase 1 facilitates Phase 2 (see Paper 2) where targeted soil sampling by zone provides a source of information that can inform variable rate application.



The Australian Society of Agronomy is the professional body for agronomists in Australia. It has approximately 500 active members drawn from government, universities, research organisations and the private sector.

Photo Credits

David Marland Photography Graham Centre for Agricultural Innovation, Charles Sturt University

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