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The central objective of JRU (Joined Research Unit) EGC is the studying and modeling of operation on vegetable covers and the soil in the context of the field crops, in interaction with environmental factors (soil, water, atmosphere) and husbandries. Within this general framework, the scientific activity of our unity is based mainly around the following themes:

Epidemiology of the air fungic diseases: process of dispersion and development of the foliar fungic diseases in interaction with atmospheric variables, the covers structure and the nitrogenized nutrition; impact on the operation of the plant cover.

Pesticides: study of their future in the environment (soils, water, atmosphere) after application: degradation, formation of bound residues, volatilization, leaching.

Air pollution, greenhouse effect: emissions and atmospheric deposits of pollutants and greenhouse gases in the agricultural systems; impact on the air quality and on the plant cover operating.
Study of the futur of waste organic products from urban areas after field application and agronomic and environmental consequences.

Nitrogen: emission of gaseous nitrogen compounds from cultivated ecosystems and analysis of the genetic variability of plant adaptatve strategies vis-à-vis nitrogen nutrition

This work is undertaken according to various approaches based mainly on the principles of physics, chemistry, as well as microbiology, ecophysiology and the genetics, all disciplines applied to agronomic or environment problems. Our JRU size and the former history of the constitutive Units enable us to cover the whole of these disciplines, on however various levels. Our scale of predilection is the agricultural plot or the profile of soil. Some work however is led to finer scales - in particular on the 3D description of the structure and the transfers in vegetable covers, as well as the expression of the genetic characters - to enable us to better sit the bases of reasoning of the analysis of the processes on our scale of predilection. Contrary, researches are also led on a scale immediately above (agricultural plot and its neighbour, hedges,…), thus extending the concepts developed with nonhomogeneous environments. For certain problems (greenhouse effect, air and water pollution) this knowledge can be integrated into higher scales by the means of atmospheric models, hydrological and of cultures operation. Essentially, these last works are undertaken with the support of other partners.

(www6.versailles-grignon.inra.fr/egc_eng)