The stem elongation stage is the perfect time for adapted liquid fertilisation. With the right information about the condition of your crops, and the combination of modern spreading technology and intelligent sensors, you can not only safeguard your yields, but also increase them. We will explain here how it works.

ISARIA Spritzensystem Teilflächenspezifische Flüssigdüngung

Nitrogen (N) is one of the five essential bulk elements, and is responsible for the growth and development processes of crops, as well as for producing a yield. Nitrogen is one of your most important tools in achieving optimal growth in your crops. As a component in chlorophyll, nitrogen controls photosynthesis in the crop, and gives it its green colouring. Why is this important? This function gives you the opportunity to optimise your fertilisation using optical sensor technology. The advantages of area-specific application are obvious – you can achieve a more homogeneous crop with the well-balanced fertiliser strategy. The yield-oriented strategy provides you with maximum exploitation of the yield potential in non-homogeneous fields.

How to: nitrogen fertilisation

For wheat farming, you should be aware of the three most important nitrogen applications. The first is initial fertilisation, and occurs during the tillering stage in spring, immediately after the dormant period. This directly affects the biomass growth and stems. An early first nitrogen application (before BBCH 25) ensures a high tillering rate at all locations. A late first nitrogen application (after BBCH 25) can encourage the shoots that have emerged to develop into eared stems. When this happens, the aim is to ensure a crop with as many strong stems as possible at the start of the stem elongation stage (BBCH 30), which the crops can also maintain in the later stages of the growth process. The second nitrogen application happens at the start of the stem elongation stage (BBCH 30-32). An optimal, need-based nitrogen supply for your crop is important here, as a lack of nitrogen during this stage of growth can cause too few of the shoots to become eared stems. The third nitrogen application should be applied to soil that has enough water as the last leaves are opening (BBCH 37-49). In this case, a new N supply will affect the production of storage cells in the corn. This application will also affect the thousand grain weight, the hectolitre weight, the falling number, the protein levels, and other quality criteria for your crop. This application can be split into two applications, depending on the location and the availability of water. If the third application is subdivided into two applications, a good availability of water is required for this strategy to be effective.

IMPORTANT: ZWhen dividing up the total fertiliser quantity, it is important to always bear in mind that the crop can only remain as well-tillered and produce as many eared stems in the early stage as can be established later by the amount of fertiliser that remains available.

How to ensure maximum efficiency during the stem application with liquid fertiliser

You can see: a targeted application of nitrogen to stems helps to safeguard and increase your yields. Liquid mineral fertilisers such as UAN (urea ammonium nitrate solution) are well-suited to application to the stem. When applying this nitrogen fertiliser in its liquid form in the second application, the use of special liquid fertiliser nozzles or drag hoses on the field sprayer is recommended to avoid causing burns to the leaves. Area-specific fertilisation should be used to avoid lodging in your crop. Along with applying your fertiliser, the ISARIA PRO Active Spray can also be used to assess your crop and carry out an N intake scan. For this purpose, up to six ISARIA PRO Active Spray sensors are mounted directly onto the frame of your sprayer. As soon as the ISARIA sensor is switched on, it emits light in a defined wavelength. Then the radiation reflected by the crops is measured. As a result, the system has its own light source and does not have to rely on the sun’s rays. A location-specific calculation of the application quantity and the transmission to your spreading device will follow. This means that all areas will be fertilised according to what is required, even in the case of non-homogeneous fields. To ensure optimal provision for your crop, you can choose between two measuring parameters:

  • One is the biomass index, which scans the crop density, even in the case of very small crops.
  • The other is the N supply index, which reflects the current nutrient condition of your crops.

The ISARIA PRO Active Spray system works for crops including:

  • Cereals (wheat, barley, oats, rye, spelt, triticale, durum etc.)
  • Corn
  • Winter rape
  • Potatoes
  • Specialist crops (lettuce etc.)

In addition: You can also use your ISARIA PRO Active Spray system according to the map overlay principle, which means a combination of a historical yield potential map and the current N intake in the crop (sensor measurement) during application. This gives you the chance to include empirical data, e.g. from the yield maps or satellite data in your fertiliser application.

Varied use of area-specific liquid fertilisation across all crops

The use of growth regulators is just as important as the fertilisation. In this case, an area-specific application makes particular sense. A uniform spray of growth regulators in areas with poorer crops on sandy knolls or on the edges of forests can reduce yields. The application rate in these locations is too high for the comparably poor crops, and inhibits the natural growth of crops too severely. At the same time, spraying depending on the biomass can reduce expenditure on the product.
However, ISARIA PRO Active Spray Spray is not only useful for nitrogen fertilisation or for the use of growth regulators. Our sensor can also be used for a number of applications, including for fungicide for cereals, to treat leaf blight in potatoes, to spray potato haulms, and to provide biomass-dependent siccation. our sensor is used.

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