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النتائج 1 - 10 من 42
Effects of vapours of chlorpropham and ethofumesate on wild species
2001
Franzaring, J. | Kempenaar, C. | van der Eerden, L.J.M.
Effects of vapours of two herbicides on plantlets of fourteen wild higher plant species and two bryophytes were screened in fumigation experiments using foliar injury, chlorophyll fluorescence and growth as response parameters. After vaporisation of the herbicides for 48 h, concentrations in the chambers reached 77 g m−3 in the chlorpropham treatments and 184 ng m−3 in the ethofumesate treatments. Despite the higher concentrations of the volatile chlorpropham (vapour pressure, VP: 1.3 mP), plants showed no foliar injury, but vapours of this herbicide caused leaf crinkling in the agriophyte Agrostemma githago. The less volatile ethofumesate (VP: 0.56 mP) caused foliar injury in all higher species, with lowest no observed effect concentrations (NOECs) of 75 ng m−3. Chlorpropham affected growth only in Agrostemma, while ethofumesate reduced growth in one third of the higher plant species. Chlorophyll fluorescence proved to be a less suitable response parameter compared to foliar injury and growth. No adverse effects were observed in mosses, probably due to the slow growth and hence small doses of herbicides taken up. The extent of foliar injury due to ethofumesate showed a weak positive relationship to relative growth rates and specific leaf area in the tested higher plant species.
اظهر المزيد [+] اقل [-]Book review on Integrated Weed and Soil Management by eds. J.L. Hatfield, D.D. Buhler & B.A. Steward (ISBN 1-57504-069-7; Ann Arbor press (1998) 400 pp.)
2001
Kropff, M.J.
Climate consequences of increasing ozone in the troposphere, studied with a coupled chemistry-general circulation model
2001
Roelofs, G.J.
Building bridges, raising dikes
2001
Harmelen, A.K. van
Evaluation of options for reduction of greenhouse gas emissions by changes in household consumption patterns
2001
Nonhebel, S. | Moll, H.C.
Globalisation, international transport and the global environment (GITAGE)
2001
Nijkamp, P.
Eco-efficiency in industrial production
2001
Raesfeld, A. von | Bakker, F. de | Groen, A.
Not to sink: bringing the tropical forest into the climate and other global conventions, without needing the 'Sink' concept
2001
Groot, W.T. de | Sielhorst, S.I.D.
Modelling the impact of climate change on the Wadden Sea ecosystem
2001
Brinkman, A.G.
The effect of aerosol on closure of the regional short-wave radiation balance
2001
Henzing, J.S.
