With the TopDress N app, you can create a variable rate task map for nitrogen side dress in potatoes. The map is based on a biomass map of your potato crop.
Contact: Fedde Sijbrandij
E-mail: fedde.sijbrandij@wur.nl
Website: www.precisielandbouw-openteelten.nl/dossiers/55-adviesregel-bijbemesten-aardappelen
Link to appstore: farmmaps.eu/en/editor/plan
Price: €20 ex BTW
With the TopDress N-app on farmmaps, you can create task maps for variable nitrogen side dress in potatoes. The app uses the general biomass and spatial variations in the biomass to generate advice and a task map.
With a nitrogen side dress system, you only give about 2/3 of the amount you would normally give when planting. The remainder is reserved for additional fertilization 4-6 weeks after the crop emerges, when the canopy has covered the soil.
The top dress N app calculates an advice from the current N-intake and an N-target number for the crop. The app estimates the N-uptake is with biomass maps from satellites, drones or nearby crop sensors. The N-target is calculated from the planting date, date of measurement and the yield forecast.
We recommend using the CI crop index. Other indices such as WDVI and some specific crop sensor indices can also be used.
You can then convert the absolute dose advices into a task map by setting the working width, minimum and maximum nitrogen rates and nitrogen content of the fertilizer.
The decision rules in top dress N are derived from an extensive series of field trials. See, among others, http://www.precisielandbouw-openteelten.nl/dossiers/55-adviesregel-bijbemesten-aardappelen
When you go through the steps in the app, you will first see the application dose rate map that shows the variation in recommended nitrogen top dressing within the field. This map is then converted into a task map that represents the place-specific product gift. This task map can be downloaded as a shape file or in ISO-XML format, and then placed in the terminal that controls the spreader.