How to connect the N-Tester BT to the Atfarm Mobile App?

The N-Tester BT is connected via Bluetooth® wireless technology to the Atfarm Mobile App. The Bluetooth® connection is not enabled by connecting the device in the Bluetooth® settings of the operating system (Android, iOS) as usually known from other devices. The Atfarm Mobile App automatically establishes a temporary connection in the background.

To connect your N-Tester BT to the Atfarm Mobile App, please follow these steps:

Step 1: Install the Atfarm Mobile App

• Download and install the Atfarm Mobile App from Google Play Store or Apple App store on your smartphone.

  Install from Google Play Store:	Install from Apple App Store:
  Scan the QR-Code with your smartphone camera and follow the link.

Step 2: Use the Atfarm Mobile App

1. Open the Atfarm Mobile App and log in to your Atfarm account with e-mail and password.
2. Create or choose a farm.
3. Create or choose a field.
4. The field page opens.
5. Scroll down to the N-Tester options and select 'Start measurement'.
6. Appears only the first time: Select your N-Tester model (you can manage your devices later in the settings page).
7. Fill the crop data sheet. Enter variety, quality goal and growth stage. Modify yield expectation, N-min and N already applied and choose if it's the last dressing. Note: Inputs vary based on country and region. Nitrogen recommendations provided by Yara are only valid for certain crops and development stages. The Atfarm Mobile App provides you this information in the crop datasheet.
8. Click 'Start measuring'.
9. Allow the app to track your GPS position.
10. Turn on Bluetooth® on your smartphone.

Read this article to learn why the Atfarm Mobile App requires a Bluetooth® connection and GPS tracking to calculate a nitrogen recommendation.

Step 3: Switch on the N-Tester BT

Hold down the ON/OFF button of your N-Tester BT for a few seconds. After initialisation, the LED blinks blue. The Atfarm Mobile App will manage the connection automatically. On some smartphones a window with Bluetooth connection options appears - please don't connect the N-Tester BT in this window. If pairing was successful, you will get a signal from the app and the blue LED will stay on. The Atfarm Mobile App will guide you to take an empty measurement against ambient light to calibrate the device. To do so, hold the N-Tester BT head closed for several seconds until your smartphone vibrates.

Note: A red blinking LED during initialisation indicates the batteries need replacing.

Step 4: Take a measurement

After you successfully connected your N-Tester BT to the Atfarm Mobile App, you are ready to measure your plants. Please read here how to measure correctly.

Please note: For now, we do not take fertiliser regulations into account for the N-Tester Analysis. Please remember to take the maximum nitrogen requirement according to the governmental fertiliser restriction when fertilising your crops.