By Hester R.E., Harrison R.M. (eds.)
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Hobbie and G. E. Likens, Limnol. , 1973, 18, 734. T. Ahl, Verh. Int. Verein. Theor. Angew. , 1975, 19, 1125. P. J. Dillon and W. B. , 1974, 9, 135. W. R. Johnston, F. Ittihadiel, R. M. Daum and A. F. Pillsbury, Proc. Soil Sci. Soc. , 1965, 29, 287. G. J. Kolenbrander, Stikstaff, 1972, 15, 56. G. W. Cooke and R. J. B. , 1973, 7, 19. G. E. Schuman, R. E. Burwell, R. F. Priest and M. D. Schuldt, J. Environ. , 1973, 2, 299. K. M. Atkinson, J. M. Elliott, D. G. George, D. C. Jones, E. Y. Howarth, S.
The methods used have included crop zonation and reduced fertilizer application, which arguably represent more responsible and more sustainable land husbandry. Much better resolution of the nutrient exports summarized in Tables 1 and 2, and for more types of land-use activity, is required. The techniques for reducing the input of nutrients from agriculture have been developing rapidly and include: E E E E E reduction in soil erosion by better land management retention of nutrients by buffer zones retention of nutrients in ditches parallel to watercourses the use of artificial wetlands at the ends of feeder streams increasing instream nutrient metabolism by stream rehabilitation (reinstatement of riffle/pool sequences) All of these techniques are available, but have not been well researched in terms of their nutrient removal efficiency.
Other recommendations withdrew the previous approval for using IPU before the crop had emerged (pre-emergence) and applications from the air. A product ‘Stewardship’ Campaign is being initiated by the IPU Task Force (a group of IPU manufacturers), including a leaflet on how to protect water quality. The NRA is keen to promote the leaflet and is willing to assist with the campaign, but is not convinced that these measures alone will be sufficient to reduce IPU concentrations in drinking water supplies to acceptable 49 K.