Farmstar QN
Monitoring of the last nitrogen application, at the end of the vegetative phase. Remote sensing is used to estimate Leaf Area Index and Chlorophyll AB content (by using an inversion of radiative transfer model). LAI and LAI*Cab are respectively converted into biomass and nitrogen uptake. The “QN method” is a mechanistic model, which combines a diagnostic of nitrogen deficiency, according to the crop Nitrogen Nutrition Index, and an agronomic prognosis, using a growing forecast including effects of water stress. The tool produces modulation maps for managing nitrogen distribution according to the chosen strategy and decision rule.
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| Name in original language | Farmstar QN |
| Name in English | Farmstar QN |
| Designer/ manufacturer | Arvalis |
| Accessibility | Sold commercially |
| Weblink | https://www.myfarmstar.com |
| Countries of primary use | France |
| Main language | French |
| Other languages available | None |
| Brief description of the tool | Monitoring of the last nitrogen application, at the end of the vegetative phase. Remote sensing is used to estimate Leaf Area Index and Chlorophyll AB content (by using an inversion of radiative transfer model). LAI and LAI*Cab are respectively converted into biomass and nitrogen uptake. The “QN method” is a mechanistic model, which combines a diagnostic of nitrogen deficiency, according to the crop Nitrogen Nutrition Index, and an agronomic prognosis, using a growing forecast including effects of water stress. The tool produces modulation maps for managing nitrogen distribution according to the chosen strategy and decision rule. |
| Target user | Tool/product manufacturer |
| Target crops | Barley, Wheat |
| Type of tool | Crop analysis |
| The tool assesses or provides guidance on | Green Area Index (GAI), Leaf nutrient content |
| Nutrients assessed | Nitrogen (N) |
| Nutrients assessed in the lab | Not included |
| The tool relies on a base recommendation system | Yes |
| Base recommendation system | Initial a priori total N rate has to be computed according to the balance sheet method. Farmstar QN allows to adjust the last N input according to plant N diagnosis. |
| The assessment frequency should be | Once per growing season |
| Required data input is | Crop, Variety, Farm location, Growth stage, Soil type, field georeferencing, weather data (from internal database using geographic coordinates of the field) |
| The data can be imported from other tools and systems | Yes |
| The tools main output format is | PDF file |
| Data can be exported | Yes |
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Funded by the European Union and UK Research and Innovation (UKRI). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union, European Commission or UKRI. Neither the European Union, European Commission nor UKRI can be held responsible for them.
Project Coordinators
Sarah Kendall
sarah.kendall@adas.co.ukSpyros Fountas
sfountas@aua.grheurope.nutrichecknet@gmail.com
Project Partners
