Agricultural crops can be either a source or a sink of ammonia (NH3). Most NH3 exchange models developed so far do not account for the plants nitrogen (N) metabolism and use prescribed compensation points. We present here a leaf-scale simplified NH3 stomatal compensation point model related to the plants N and carbon (C) metabolisms, for C3 plants....
Modelling can be a powerful tool to help us understand and evaluate farmers’ practices. It can provide us with references that can then be compared to farmers’ practices. We applied this type of modelling approach in order to understand and to evaluate N fertilisation in apple orchards. We used Epistics, an agronomic model that simulates the N and ...
L'augmentation des teneurs en nitrate de l'eau dans la plupart des territoires d'élevage intensif et les réglementations européennes mises en place depuis 5 ans dans le cadre de la directive Nitrate puis de la directive cadre sur l'eau ont suscité de nombreux travaux pour évaluer et prédire les risques de pertes d'azote sous les principaux systèmes...
Comme l'annoncent plusieurs études, l'augmentation de la diversité spécifique des couverts prairiaux permet-elle une augmentation de la production fourragère et un moindre salissement par les adventices ? Un dispositif mis en place à Lusignan fournit des éléments de réponse. Ce dispositif en microparcelles est composé de 25 couverts avec une divers...
The effects of enriched CO2 atmosphere on partitioning of recently assimilated carbon were investigated in a plant-soil-microorganism system in which Lolium perenne seedlings were planted into cores inserted into the resident soil within a sward that had been treated with elevated CO2 for 9 consecutive years, under two N fertilisation levels (Swiss...
Take-all of wheat is a major disease in most wheat production areas throughout the world. To date, there exists no single method of control that can alone provide high levels of efficacy.Some techniques, such as delaying the sowing date, reducing sowing density, using a fungicide seed treatment or applying an ammonium form of nitrogen fertilisation...
In order to reduce the diffuse pollution risks from groundwater, agricultural development agencies are encouraging collective advisory activities with farmers. Could mathematical simulation models of water and nitrogen fluxes assist these people to prioritise changes in nitrogen management practices and to estimate their impact on the nitrate conte...
