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Resultados 41-50 de 304
Re-utilization of municipal wastewater sludges: metals and nitrate.
1981
Chang A.C. | Page A.L. | Bingham F.T.
Comments on the United States Environmental Protection Agency's proposal to add ammonia to the toxic pollutant list.
1981
Lee G.F. | Jones R.A.
Reclamation of wastewater with a soil-turf filter. I. Removal of nitrogen [Reuse of wastewater for irrigation].
1981
Anderson E.L. | Pepper I.L. | Kneebone W.R.
Simulation model for agricultural non-point-source pollution [Water pollution].
1981
Tubbs L.J. | Haith D.A.
Losses of nitrogen, phosphorus and potassium from agricultural watersheds of minor rivers in the Oka valley [USSR].
1981
Kudeyarov V.N. | Bashkin V.N. | Kudeyarova A.Y.
The losses of nitrogen (NH(,4), NO(,3), N(, org)), phosphorus (P(, ortho), P(, poly), P(, org)) and potassium (K('+)) from watershed areas of minor rivers, draining regions of different agricultural land use in the Oka Valley, U.S.S.R., were investigated. No N, P, and K pollution was shown in these watersheds, even though the rate of losses was found to be highly correlated with the amounts of mineral fertilizers and FYM applied. The losses were also determined by the natural soil fertility, erosion processes and soil texture under the similar level of fertilization.
Mostrar más [+] Menos [-]Effects of low-level SO2 fumigation on decomposition of western wheatgrass litter in a mixed-grass prairie.
1981
Dodd J.L. | Lauenroth W.K.
Water reclamation and reuse [Irrigation, groundwater recharge, industrial and domestic use].
1981
Hrudey S.E.
Eutrophication [Nutrient loading concepts].
1981
Medine A.J. | Porcella D.B.
Fresh water macroinvertebrates [as indicators of water pollution].
1981
Quigley M.A.
