Tactical use of nitrogen in canola to manage risk and include break crops in northern Wimmera

Time by rate of N for canola


Nitrogen fertiliser is often the single biggest variable cost to canola growers in the northern Wimmera. Throughout the drought, canola was commonly dropped from the rotation in the region as it was seen as a risky crop. To counter some of this risk, some growers changed from pre-drilling all nitrogen fertiliser to splitting or deferring all nitrogen fertiliser applications. Read more

Year of initiation:2012
Year of completion:2012


18 Feb 2012

Trial Final Report
Download a copy of the final trial report here

28 Jan 2012

Background, Site Description and Methods Used
What we did, why we did it and how we did it.

28 Jan 2012

What we found

28 Jan 2012

Conclusions and Summary
What we think it means

13 Sep 2011

Wallup Site September 11, 2011
Photo series taken just prior to the late topdressing.

09 Sep 2011

Wallup Ag Group Field Days
Pictures from the field, September 01, 2011.

02 Sep 2011

Wallup Ag Group Field Day
Photos and descriptions of treatments on September 01.

10 Aug 2011

Crop emergence and early growth

10 Aug 2011

Top Dressing Time
Crop Progress as at 4th August

10 Aug 2011

Sowing the Trials
Establishment of Wallup Expo trial site

Interpretive Summary


A trial was undertaken to determine if N rates for canola can be reduced in the Wimmera without loss of yield. It also aimed to determine how late N can be topdressed. There was no response to a low rate of N, while 50 kg N/ha when applied at or near sowing gave a 54% yield increase, and 100 kg N/ha application raised yields a further 14%. Nitrogen rate is therefore very important, but timing—when applied even up until early flowering—had little effect.

Updates & Reports


2013 Annual Report


Project Description

Canola 250 kg N/ha

Project Leader

Felicity Pritchard, PACE Consulting

Project Cooperators


IPNI Staff

R. M. Norton


Oceania \ Australia and New Zealand \ AUS \ Victoria \ Wimmera


4r rate, 4r time, best management practices, nutrient management

rapeseed (canola)

Nitrogen (N)