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•rement ou en ventilant lÕintŽrieur de celui-ci.
speciÞc ways of reducing n2o emission vary for farming systems across canada, but examples include the following:
Last Update: 2015-05-14
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le c reste alors protŽgŽ ˆ lÕintŽrieur des agrŽgats, o
productivity so it is probably only feasible on marginal lands.
Last Update: 2015-05-14
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cependant, une fois ˆ lÕintŽrieur de la feuille, lÕozone est tr
in one study, for example, the o3 ßux above a soybean Þeld increased during the day but then dropped sharply when the stomata began closing (fig.
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lorsque le fumier est entassŽ, lÕintŽrieur du tas est mal aŽrŽ, ce qui peut provoquer des Žmissions de ch4.
most soils have enough aeration that they do not produce ch4; in fact, microorganisms in the soils convert ch4 to co2 so that the soils ÒabsorbÓ ch4.
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cette mŽthode permet dÕŽviter certaines des conditions artiÞcielles existant ˆ lÕintŽrieur des enceintes, mais elle est plus cožteuse.
researchers have used an extensive network of this type to monitor o3 effects on yields in the fraser valley, a highly populated area with intensive agriculture (fig.
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une fois ˆ lÕintŽrieur de la feuille, lÕozone oxyde les molŽcules de la membrane des cellules et provoque ainsi la dŽgradation de cette membrane.
as a result of the direct damage and the reduced photosynthesis, yields of some plants can be dramatically reduced by long-term exposure to elevated o3 levels.
Last Update: 2015-05-14
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•re la plus simple de mesurer la rŽaction des plantes ˆ la prŽsence dÕozone consiste ˆ les faire pousser dans des enceintes dŽcouvertes, ˆ lÕintŽrieur desquelles on introduit continuellement du o3 ˆ des concentrations simulant les variations journali •res. cette mŽthode permet aux chercheurs dÕŽvaluer les effets de plusieurs concentrations de o3 (jusquÕˆ trois fois la concentration dans lÕair extŽrieur), ainsi que les effets dÕautres gaz ou dÕautres polluants que lÕon peut introduire simultanŽment.
observations from biomonitors and passive monitors can be related to potential crop effects by placing these monitors inside a zaps along with other crop plants.
Last Update: 2015-05-14
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