Know more

Our use of cookies

Cookies are a set of data stored on a user’s device when the user browses a web site. The data is in a file containing an ID number, the name of the server which deposited it and, in some cases, an expiry date. We use cookies to record information about your visit, language of preference, and other parameters on the site in order to optimise your next visit and make the site even more useful to you.

To improve your experience, we use cookies to store certain browsing information and provide secure navigation, and to collect statistics with a view to improve the site’s features. For a complete list of the cookies we use, download “Ghostery”, a free plug-in for browsers which can detect, and, in some cases, block cookies.

Ghostery is available here for free:

You can also visit the CNIL web site for instructions on how to configure your browser to manage cookie storage on your device.

In the case of third-party advertising cookies, you can also visit the following site:, offered by digital advertising professionals within the European Digital Advertising Alliance (EDAA). From the site, you can deny or accept the cookies used by advertising professionals who are members.

It is also possible to block certain third-party cookies directly via publishers:

Cookie type

Means of blocking

Analytical and performance cookies

Google Analytics

Targeted advertising cookies


The following types of cookies may be used on our websites:

Mandatory cookies

Functional cookies

Social media and advertising cookies

These cookies are needed to ensure the proper functioning of the site and cannot be disabled. They help ensure a secure connection and the basic availability of our website.

These cookies allow us to analyse site use in order to measure and optimise performance. They allow us to store your sign-in information and display the different components of our website in a more coherent way.

These cookies are used by advertising agencies such as Google and by social media sites such as LinkedIn and Facebook. Among other things, they allow pages to be shared on social media, the posting of comments, and the publication (on our site or elsewhere) of ads that reflect your centres of interest.

Our EZPublish content management system (CMS) uses CAS and PHP session cookies and the New Relic cookie for monitoring purposes (IP, response times).

These cookies are deleted at the end of the browsing session (when you log off or close your browser window)

Our EZPublish content management system (CMS) uses the XiTi cookie to measure traffic. Our service provider is AT Internet. This company stores data (IPs, date and time of access, length of the visit and pages viewed) for six months.

Our EZPublish content management system (CMS) does not use this type of cookie.

For more information about the cookies we use, contact INRA’s Data Protection Officer by email at or by post at:

24, chemin de Borde Rouge –Auzeville – CS52627
31326 Castanet Tolosan CEDEX - France

Dernière mise à jour : Mai 2018

Menu Logo Principal

Home page

Les adventices réduisent le rendement, et la réduction d'usage d'herbicides aggrave cette perte si elle n'est pas compensée des mesures préventives et curatives alternatives

Reduced herbicide use does not increase crop yield loss if it is compensated by alternative preventive and curative measures

Colbach N, Cordeau S (2018) Reduced herbicide use does not increase crop yield loss if it is compensated by alternative preventive and curative measures. Eur J Agron 94:67-78.

Cette étude analyse les relations entre usage d'herbicides, infestation par les adventices et pertes de rendement en parcelles d'agriculteurs, via la simulation. Nous avons simulé 272 systèmes de culture d'agriculteurs de 7 régions avec le modèle FlorSys, en partant d'une flore adventice régionale. Nous avons également simulé ces systèmes sans adventices pour déterminer la perte de rendement due aux adventices, et enfin sans herbicides pour déterminer l'effet des herbicides sur la perte de rendement et les adventices. Les résultats montrent que (1) la perte de production augmente avec la biomasse adventice et elle est très corrélée au ratio biomasse adventices/biomasse de la culture à floraison, (2) il n'y a pas de relation entre IFT herbicide d'une part, biomasse adventice et perte de rendement d'autre part parce que les agriculteurs prennent des mesures compensatoires lorsqu'ils réduisent l'usage d'herbicides, (3) la perte de rendement et la nuisibilité liée aux adventices augmentent lorsqu'on supprime les herbicides dans les systèmes sans aucune autre modification, (4) les effets sont plus marqués à l'échelle pluriannuelle qu'à l'échelle annuelle.

L'étude a montré aussi que l'usage des herbicides varie en fonction des autres pratiques ce qui interdit d interpréter cet usage indépendamment de ce qui est fait par ailleurs. Les systèmes de culture les plus sensibles à la suppression des herbicides étaient basés sur des rotations monotones avec un couvert végétal de courte durée, un fort niveau d'usage herbicide, du non-labour ou du labour hivernal, et des roulages fréquents. Enfin, nous avons établi un arbre de décision prédisant la perte de rendement en fonction des pratiques culturales pour conseiller les agriculteurs et les conseillers lors de la conception de systèmes de culture conciliant niveau usage d'herbicides et faible perte de rendement due aux adventices.