Yield and N Calculators

The Yield and N Calculators (previously known as the Mallee Calculator) calculate nitrogen requirements and yield for cereals and canola in southern Australia.

Read about our selection process for including tools on Climate Kelpie

 

Who this tool is for

Cereal and canola growers in dryland agricultural systems of southern Australia.

Cereal and canola growers in dryland agricultural systems of southern Australia.

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Questions this tool answers

Based on starting soil water, what is the likely yield response to given levels of nitrogen and predicted rainfall?

How much nitrogen does my wheat crop need this season?

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What this tool does

The Yield and N Calculators can help you balance the availability of water with nitrogen fertiliser requirements to achieve the desired yield and grain quality.

There are two calculators:

  • The Generic Calculator – this general version uses your inputs of growing-season rainfall
  • Your Soil's Potential Calculator – an automated version for low-rainfall situations i.e. < 500 mm annual rainfall; (this is the former Mallee Calculator equivalent)

To use the calculators, you need Microsoft Excel® on your computer.

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Inputs

You enter you own data, such as:

  • soil data from soil tests and your knowledge – type, texture, organic content, total soil nutrients, soil carbon:nitrogen ratios, bulk density, porosity
  • information about current and previous crops, rainfall and soil moisture

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Outputs

The calculators results are displayed in tables and graphs in the spreadsheet. Figure 1 is an example.

Tables and graphs - output from Your Soil’s Potential Calculator

Figure 1. Sample output from Your Soil’s Potential Calculator

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Reliability

The Generic Calculator relies on accurate growing-season rainfall.

Your Soil's Potential Calculator only works for wheat areas with less than 500 mm annual rainfall.

The calculators are not predictive – they cannot use climate forecasts.

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History

The calculators were funded through a series of Grains Research & Development Corporation projects led by Jeff Baldock from CSIRO Land and Water, Adelaide.

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Support available

Contact Jeff Baldock, CSIRO Land and Water, Adelaide

Email: jeff.baldock@csiro.au

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Where to get it

Where to get it

Download the two calculators and instructions for use from CSIRO

For enquiries:

Email: ncalculator-gw@csiro.au

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Cost

Free

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