The N-Tester BT and former N-Tester models help you to get optimum use of the available nitrogen budget, to reduce nitrate leaching and to avoid the formation of crop lodging due to over-fertilization. By that you can make more informed decisions, improve grain quality, control costs and protect our environment.
If you are limited in the maximum amount of nitrogen because you are working in an environment protection area, you can't generate the maximum yields. Knowing the fields helps to optimize the use of the limited nitrogen budget. The N-Tester BT supports you achieving this by comparing the nitrogen fertilization requirement between the individual fields. In this way the good crops are distinguished from the worse ones. You can better supply the good crops, while neglecting the worse ones. With regular measurements, you can detect when organic nitrogen fertilization is taking effect.
Please note: For now we do not take EU nitrogen limitations into account for the N-Tester Analysis. Please remember to take the maximum nitrogen requirement according to the governmental fertilizer restriction when fertilizing your crops.
How does the N-Tester work?
The N-Tester BT measures the chlorophyll content in the leaves. All N-Tester models work based on the same principle: The SPAD-502Plus chlorophyll meter determines the relative amount of chlorophyll present by measuring the absorbance of the leaf in two wavelength regions. Due to the almost linear ratio of chlorophyll to nitrogen content, the chlorophyll value can be used to conclude whether the plant is under- or oversupplied with nitrogen. The more nitrogen absorbed by the plant, the higher the chlorophyll concentration and therefore the higher the photosynthesis performance. The latter has a particular influence on grain yield and grain quality/protein content. A nitrogen fertilization recommendation is then derived from this measured value.
Yara carries out annual tests at various locations to verify the recommendations. Every year, the N-Tester is optimized and further developed by Yara's researchers.
Which crop types are measurable?
In general you can analyze cereals with the N-Tester. The available calibrations for crop types and the measuring method vary from country to country for the N-Tester Analysis. We are always working on extending the measurable crop types for you.
To check the current availability of crops for your country, please contact our Customer Support Team.
When do I use the N-Tester?
You can use the N-Tester BT in later growth stages from the second application (GS/ BBCH 31-33) of fertilizer for cereals up to GS/ BBCH 51. For example, in wheat you can determine the nitrogen fertilization requirement at different times by regular nitrogen monitoring, but also determine the effect of nitrogen applications already fertilized. The N-Tester BT helps to choose the optimal time and amount of fertilizer.
What is required to use the N-Tester BT?
In order to get nitrogen recommendations with the N-Tester BT, you need to download the free Atfarm mobile app from the app store on your smartphone. In order to use the Atfarm mobile app, you need to register to Atfarm. But don't worry, you don't have to pay for registering to Atfarm and using the corresponding N-Tester module of the mobile app.
The N-Tester BT is easily connected via Bluetooth® wireless technology to the Atfarm mobile app. You can also connect your former N-Tester model to the Atfarm mobile app.
The nitrogen recommendation will be directly calculated and displayed on your smartphone in kg/ha. Similarly, specific information such as 'expected yield', 'nitrogen quantities already applied' or 'last application' can be used to optimize the fertilization recommendations for each field.
Do I need an internet connection for using my N-Tester BT?
You don't need an internet connection during usage. You only need an internet connection during the setup (download and registration) of the Atfarm mobile app.
Do I need to subscribe to an N-Tester in order to use other functions of Atfarm?
You don't have to own the N-Tester to use other functions of Atfarm. All modules of Atfarm can be used independently from each other. It is optional for you to purchase an N-Tester BT subscription and use the N-Tester module of Atfarm.