Yara Digital Products

Maximise your return
on nitrogen applications
How much nitrogen should you apply to your cereals? Find out with the free N-Tester BT.

NEW: In-field tracking

AtFarm

Why use the N-Tester BT?

AtFarm

Easy and affordable

Maximise return on N applied and improve yield quality with field specific N-rate recommendations based on the real N-uptake of your cereals.

Agronomically robust

The N-Tester BT has been field tested across hundreds of trials and developed by Yara Research & Development for over 25 years.

When to use the N-Tester BT?

AtFarm

How does the N-Tester BT work?

Hand with the N-Tester

The N-Tester BT


The device uses an LED and light sensor to instantly measure the chlorophyll content of a crop when you clamp it onto the newest fully developed leaf of a crop. This green level shows the N content of the plant.

These N-Tester values are automatically sent to your mobile device via Bluetooth™ connection. No internet or cellular signal is needed to record or take measurements.

Hand with the N-Tester Clipping

The Atfarm App


Atfarm uses an algorithm powered by Yara agronomists to calculate the current N balance of your field based on the N-uptake measurements from the N-Tester BT. Decades of field trials by Yara ensure these calculations are accurate.

All you have to do is enter information about your field: crop type, variety, growth stage, target yield estimate, soil N supply, N already applied. After measuring your crops, you get an N recommendation that shows you the exact N needs of your crops.


AtFarm

Your N-rate recommendation


Open the Atfarm app and easily find the N-rate recommendation for your crops (shown in kilos of nitrogen per hectare).

The N-rate recommendations from the N-Tester BT are designed to help fine-tune N-applications during the growing season and help you maximise the yield return for every kilo of N you apply.

Optimise nitrogen use on your fields in 8 steps

  • AtFarm
    1

    Turn your N-Tester BT on by holding the On/Off button until the LED on top turns blue.

  • AtFarm
    2

    Open the Atfarm app and select your farm and field.

  • AtFarm
    3

    Scroll down to the N-Tester section and tap Start measurement.

  • AtFarm
    4

    Add your crop and growth stage information.

  • AtFarm
    5

    Tap Start measuring. The app will now check the connection between your smartphone and N-Tester BT. This may take a few seconds.

  • AtFarm
    6

    Calibrate your N-Tester by holding down the head of the device and taking an empty reading.

  • AtFarm
    7

    Measure the youngest fully-developed leaves on at least 30 plants across your field.

  • AtFarm
    8

    TIP: Use the Optimised or N-Uptake maps on your smartphone screen to navigate across your field in a W or Z pattern.

    Each measurement you take is recorded with a location in the app for easy future reference.