Agricultural Chemicals and the Environment by Hester R.E., Harrison R.M. (eds.)

By Hester R.E., Harrison R.M. (eds.)

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J. Furrer, Schweizer. Z. , 1972, 34, 41. W. P. D. Stewart, E. May and S. B. Tuckwell, Tech. , MAFF, 1973, 32, 276. R. P. Troake, L. E. Troake and D. E. Walling, Tech. , MAFF, 1973, 32, 340. Eutrophication of Natural Waters and Toxic Algal Blooms however, is the fact that almost all of the increase arrived in solution, meaning that the readily available nutrient fraction increased over the same period by almost 14-fold. Against the background of palaeolimnological studies carried out on this lake, it was also possible to judge that there had been a slow enrichment of the lake following the Iron Age and later forest clearance, pastoral farming, human settlement and quarrying.

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. I. Heaney, C. A. Mills, C. S. Reynolds and J. F. Talling, A General Assessment of Environmental and Biological Features of Windermere and their Susceptibility to Change, Freshwater Biological Association, Ambleside, 1985.

Although non-statutory at present, these standards are used by the NRA to derive consent conditions. Table 3 shows some of the EQSs currently available for agricultural pesticides. 1 g l\, but very few have been recorded as failing these operational standards. In 1993 there were no failures in environmental waters for isoproturon, chlorotoluron, mecoprop or MCPA. 11 Monitoring Pesticide monitoring has historically been targeted at pesticide problems known about for many years. This has now progressed and models are being used to predict the pesticides most likely to be detected in watercourses.

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