VRA Haulmkilling

Wageningen Plant Research

Contact: Corné Kempenaar en Fedde Sijbrandij

E-mail: corne.kempenaar@wur.nl


Link to appstore:


This app makes it possible to make a variable dose rate map of a potato haulm killing herbicide using a biomass map of the crop (vegetation index NDVI or WDVI), and to convert this map into a task map controlling the site-specific spray volume of the sprayer used.

With the haulm killing app on Farmmaps you can create task maps for variable dosing of potato haulm killing herbicides (desiccants) in potatoes. The App offers you possibilities to translate information about status and spatial variation in the above-ground biomass of the crop into site-specific minimum-effective doses. You must indicate in the input screen which product you want to apply, what specific crop conditions are, the spraying strategy, the spraying volume and maximum variation around this volume.

Often used measures (indices) for the amount of above-ground biomass are NDVI or WDVI. These indices are a measure of the amount and activity of the above-ground biomass. The lower the index value, the lower the dosage can be. Maps of biomass indices can be obtained via cameras on satellites, or via cameras on drones or sensors on agricultural machines. In Farmmaps it is possible to use satellite based biomass maps with a resolution of about 10 m. In addition to satellite images, you can also upload your own drone images or data from your own sensors on the machine in Farmmaps, and use it in the app to create an application map and a task map.

The decision rules (dosing algorithms) that are applied in the Haulm Killing app are derived from field trials, supplemented where necessary with expert judgement. For more information about the basic model and the specifications, reference is made to the PPL report 80 at https://www.precisielandbouw-openteelten.nl/dossiers/112-vra-gbm-bodemherbiciden-en-granulaten.


In a few steps you can choose in the app:

1. The satellite or drone image you want to use

2. The product you want to use appropriate to the situation and strategy

3. The sprayer you want to work with plus settings


As you go through the steps, you will be presented with an application map showing the variation in minimum effective rates within the field. This map is then converted into a task map that represents the site-specific spray volume. This task map can be downloaded as a shape file or in ISO-XML format, and this task map file is then loaded in the terminal that controls the sprayer.

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