Refine search
Results 1-10 of 11
Towards integrated national modelling with particular reference to the environmental effects of nutrients
1998
Alkemade, J.R.M. | Grinsven, J.J.M. van | Wiertz, J. | Kros, J. (National Institute of Public Health and the Environment, Bilthoven (Netherlands))
Effects of eutrophication in drainage ditches
1998
Janse, J.H. | Puijenbroek, P.J.T.M. van (RIVM, Laboratory of Water and Drinking Water Research, P.O. Box 1, NL-3720 BA Bilthoven (Netherlands))
Nitrogen in Dutch freshwater lakes: trends and targets
1998
Molen, D.T. van der | Portielje, R. | Nobel, W.T. de | Boers, P.C.M. (Institute for Inland Water Management and Waste Water Treatment, Lelystad (Netherlands))
Leaching of nitrate from agriculture to groundwater: the effect of policies and measures in the Netherlands
1998
Oenema, O. | Boers, P.C.M. | Eerdt, M.M. van | Fraters, B. | Meer, H.G. van der | Roest, C.W.J. | Schroder, J.J. | Willems, W.J. (AB-DLO, P.O. Box 14, 6700 AA Wageningen (Netherlands))
Effects of low pH and aluminum on root morphology of Japanese red cedar saplings
1998
Hirano, Y. | Hijii, N. (Laboratory of Forest Protection, School of Agricultural Sciences, Nagoya University, Nagoya 464-8601 (Japan))
The manure model: manure, minerals (N, P and K), ammonia emission, heavy metals and the use of fertiliser in Dutch agriculture
1998
Oudendag, D.A. | Luesink, H.H. (Agricultural Economics Research Institute [LEI-DLO], The Hague (Netherlands))
Nitrogen deposition in Swiss forests and its possible relevance for leaf nutrient status, parasite attacks and soil acidification
1998
Fluckiger, W. | Braun, S. (Institute for Applied Plant Biology, CH-4124 Schonenbuch (Switzerland))
Effects of Alkalinity and External Sulphate and Phosphorus Load on Water Chemistry in Enclosures in an Eutrophic Shallow Lake
1998
Bellemakers, Martijn J. S. | Maessen, Mario
As a result of changes in hydrology, the former mesotrophic, shallow lake Naardermeer, has been eutrophicated during the last decades. To compensate for shortage of water, eutrophicated water with different chemical characteristics has been supplied. In order to determine the effects of alkalinity, acidity and external sulphate and phosphorus load on eutrophication processes, developments in water chemistry have been studied in enclosures. A decrease of the phosphorus load of the lake did not improve water quality on the short term. This observation was confirmed by this enclosure experiment. Reduction of alkalinity did improve water quality, particularly by reductions of turbidity and chlorophyll-a content. The significant increase in sulphate load in the water layer led to deterioriation of the water quality and an increased biomass of sessile algae by internal eutrophication, probably as a result of increased sulphate reduction in the sediment. Therefore, it seems that lowering of sulphate concentrations in the inlet water after the removal of phosphorus is necessary to improve the water chemistry. The best option, however, is to restore the former hydrological conditions after which the system will be fed only by seepage of groundwater poor in nutrients and sulphate.
Show more [+] Less [-]The environmental impact of shrimp aquaculture and the coastal pollution in Mexico
1998
Paez-Osuna, F. | Guerrero-Galvan, S.R. | Ruiz-Fernandez, A.C. (Estacion Mazatlan, Instituto de Ciencias del Mar y Limnologia, Universidad Nacional Autonoma de Mexico, Apdo. Postal 811, Mazatlan 82000, Sinaloa (Mexico))
Behaviour and impact of cow slurry beneath a storage lagoon. 1. Groundwater contamination 1975-1982
1998
Withers, P.J.A. (Bridgets Dairy Research Centre ADAS, Winchester, Hampshire (United Kingdom).) | McDonald, H.G. | Smith, K.A. | Chumbley, C.G.
