خيارات البحث
النتائج 1351 - 1360 من 61,240
Lagoons and oxidation ponds [Used for livestock wastes].
1982
George D.B.
Biological filters [Wastewater treatment studies including tannery wastes].
1982
Switzenbaum M.S.
Reduction in soybean yield after exposure to ozone and sulfur dioxide using a linear gradient exposure technique.
1982
Reich P.B. | Amundson R.G. | Lassoie J.P.
A linear gradient field exposure system was modified from one originally described by Shinn et al. (1977) and used to expose field grown soybeans (Glycine max cv Hark) to a concentration gradient of a mixture of two gaseous pollutants: SO(,2) and O(,3). Since this technique does not use enclosures, study plants experienced near ambient fluctuations in environmental conditions, including wind, and hence were exposed to widely fluctuating pollutant concentrations. Plants in the gradient system were exposed to both pollutants for 57 h on 12 days during the pod-filling period (31 August-17 September). Mean concentrations during the 57 h of exposure at the 'high' end of the gradient were 0.16 and 0.06 mu-l/l (ppm) SO(,2) and O(,3), respectively, with 10 h at greater than 0.25 and 0.10 mu-l/l h SO(,2) and O(,3), respectively. Total doses for these plants were estimated to be 9.0 and 3.5 mu-l/l. h SO(,2) and O(,3), respectively. Comparison with plants exposed to ambient air indicated that exposure to SO(,2) and O(,3) reduced total yield per plant and dry mass per bean by as much as 36 and 15%, respectively. Since concurrent exposure to a much higher dosage of SO(,2) alone (20.2 mu-l. h) was observed in a separate experiment to have no significant effect on yield, O(,3), although present at moderately low levels, was probably responsible (alone or synergistically with SO(,2)) for the greatest reduction in seed size and yield.
اظهر المزيد [+] اقل [-]Bioaccumulation and toxicity of heavy metals and related trace elements [Accumulation in aquatic plants and animals].
1982
Murphy C.B. Jr. | Spiegel S.J.
Coal and coal mine drainage [Environmental aspects].
1982
Olem H.
Denitrification [of soils, wastewater, and the marine environment].
1982
Prakasam T.B.S. | Krup M.
Inhibition of nitrification by arsenic, chromium, and fluoride [Pollution from, fertilizer, coking refining, food processing, organic chemical industries].
1982
Beg S.A. | Siddiqi R.H. | Ilias S.
Effect of liquid wastewater sludge application on crop yield and water quality.
1982
Duncomb D.R. | Larson W.E. | Clapp C.E. | Dowdy R.H. | Linden D.R. | Johnson W.K.
Determination of total Kjeldahl nitrogen and total phosphorus in surface waters and wastewaters.
1982
Bowman G.T. | Delfino J.J.
Disease outbreaks caused by drinking water [Bacteria, viruses].
1982
Dufour A.P.
