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  • Soil Nitrogen Supply Calculator

Soil nitrogen supply calculator

If you need information on soil nitrogen supply and help with nitrogen fertiliser decisions making, this is the tool for you!

Click here to download the Quick N and Soil N supply calculator

Note: Please open from your desktop's "downloads" section to enable editing. It may not work in your browser.

Watch here as FAR's Dirk Wallace takes you step by step through how to use the calculator. 

Related Resources

09 October 2025

How to use the soil nitrogen supply calculator - video

Watch here as FAR's Dirk Wallace takes you through step by step how to use FAR's soil nitrogen supply calculator.

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09 October 2025

How to take soil samples - video

FAR's Senior Environment Researcher Dirk Wallace takes you through the steps to taking your own soil samples and sending them off to the lab.

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09 October 2025

Moisture probe trial at Chertsey research site

The moisture probe trial is back for 2025-26 season. We have moisture probes from different providers installed at our Chertsey research site. View the different companies dashboards here.

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09 October 2025

Soil compaction webinar with Philip Wright

Soil health is the key to success in any farming system, join this evening webinar with Philip Wright owner of Wright Resolutions Limited (UK) to learn how reduced and more effective tillage, correct use of tyre pressures can impact on your soil health and structure, possibly increasing yields.

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09 October 2025

Cost of Production spreadsheet

FAR contracts the services of Macfarlane Rural Business annually to update the Cost of Production spreadsheet for a standard set of crops from a case study group of a typical irrigated Mid-Canty arable farm with a mid to high input system.

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09 October 2025

2G and 3G decommission - what you need to know

With Spark and One NZ decommissioning their 2G and 3G networks across the country near the end of 2025. FAR has contacted the companies involved with the moisture probe trial to find out how it could affect your farm.

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09 October 2025

Autumn round up booklet 2025

Read the booklet for the 2025 autumn round up series here. 

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09 October 2025

Measuring losses at harvest

Following the 2024 combine workshops the team have been travelling around the South Island meeting with growers and helping them reduce their losses and improve combine efficiency. Find out more about how you can measure your harvest losses here. 

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09 October 2025

Moisture monitoring considerations

FAR's technology manager Chris Smith gives you some tips and tricks to help you pick the best moisture sensor for your system.

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09 October 2025

FAR Technical Report Issue 1: Moisture Monitoring Project 2023/24

In 2023, FAR set up a Moisture Monitoring project at its Kowhai Research Site in Lincoln to provide independent insights into the range of moisture monitoring systems available in New Zealand. This report covers findings from the first year of the trial and outlines key considerations when choosing a moisture monitoring system.

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