N-Tester BT | YaraPlus UK

Boost yield and quality with N-Tester recommendations

Sustainable

Reduce nitrogen losses and environmental impact while optimising yield. Precise nitrogen rates reduce your risk of lodging and nitrogen leeching into local waterways.

Reliable & trustworthy

N-Tester recommendations are calculated using over 25 years of Yara product development and field trials studying nitrogen use.

Customisable & efficient

Improve nitrogen use and results each season. Plus, take your results further with variable application and other tools in YaraPlus.

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Tailor-made nitrogen rates for each field and season

"Monitoring the crops through the season, with the N-Tester, will give accurate recommendations based on what the nitrogen levels are in the crop. With more accurate rates for each field, the use efficiency will increase, meaning you’re getting the most out of the nitrogen that you are applying.” 

Natalie Wood
Specialist in Crop Nutrition and Digital Tools

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Reduce nitrogen losses and lower environmental impact.

Recommendations help you adapt nitrogen applications to the conditions each season, making them more targeted and efficient

Use your N-Tester recommendations when creating variable application maps to make your nitrogen strategy even more efficient.

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Custom nitrogen rates in a few steps

1
Use the YaraPlus mobile app to select a field
2
Add crop and dressing information
3
Measure 30 plants on your field with the N-Tester BT
4
Tap 'Get recommendations'

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YaraPlus is the new home for all Atfarm tools and services

Why the change?

As part of this transition, Atfarm will be phased out during 2026, so we encourage you to sign up to YaraPlus to continue accessing everything you need, all in one place.

YaraPlus brings together the tools you already rely on, including Crop Monitoring, N-Tester BT and Variable Rate Application (VRA) while also giving you access to additional features such as Tankmix, Events, Podcasts, and much more, all within a single platform.

What do you need to do to keep working on your fields?

1. Visit app.yaraplus.com and create a free YaraPlus account
2. In Atfarm Classic, export your existing fields
3. Import your fields into YaraPlus
4. If you have a John Deere account, you can easily reconnect, and your fields will sync automatically

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Frequently asked questions (FAQ)

How much does the N-Tester BT cost?
Yara fertiliser users who have purchased a minimum of 50 tonnes or m³ of Yara Solid or Liquid products this season, are offered a free subscription to the N-Tester feature in the YaraPlus app.
How do I get hold of an N-Tester BT?
Order an N-Tester BT device by activating the subscription with a voucher code. Voucher codes can be requested from YaraPlus with proof of fertiliser purchase. Subscriptions can be renewed yearly with a new code. The N-Tester BT device is leased to you for free while your subscription is active.>
What is the criteria for a N-Tester BT?
Min 50t or 50m3 this season of Yara Solid or Liquid products.
What crops can the N-Tester BT be used on?
The N-Tester BT has only been calibrated in the UK for use on winter cereals - winter wheat and winter barley as well as winter oats and winter rye - On these crops can be used to determine the nitrogen status of the plant and from this, a variety-specific nitrogen recommendation can be calculated. In theory, N-Tester BT could be used on any plant to measure the chlorophyll content of the leaf and as such could be a useful management tool, however, no other crop calibrations exist so these would need to be developed locally by the user and any recommendations would need to be confirmed by locally conducted trials.

Boost yield and quality with N-Tester recommendations

Sustainable

Reliable & trustworthy

Customisable & efficient

Tailor-made nitrogen rates for each field and season

Reduce nitrogen losses and lower environmental impact.

Custom nitrogen rates in a few steps

YaraPlus is the new home for all Atfarm tools and services

Why the change?

What do you need to do to keep working on your fields?

Frequently asked questions (FAQ)

How much does the N-Tester BT cost?

How do I get hold of an N-Tester BT?

What is the criteria for a N-Tester BT?

What crops can the N-Tester BT be used on?