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

ISBN-10: 0854042202

ISBN-13: 9780854042203

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As yet this aspect of the cost—benefit analysis has not been fully developed in the UK. Having determined a range of options and costs for eutrophication control in a particular catchment, consultation on the details of the ‘Action plan’ with all those involved is needed before any plan can be implemented. 7 Conclusions The diffuse and point source inputs of nutrients from agricultural practices, causing eutrophication, are still ill-defined and the effects of nutrient regulation are difficult to predict.

9 Recent Pesticide Developments In the 1990s, pesticide development progressed still further. The sulfonylurea herbicides were developed and have extremely low application rates. For example, the recommended rate for metsulfuron methyl is 6 g ha\. 1 g l\, but does not necessarily preclude any environmental impact. Their high herbicidal activity means they may affect aquatic plants, even at very low concentrations. Monitoring for sulfonylureas is not yet undertaken by the NRA; 52 Impact of Agricultural Pesticides on Water Quality currently their low doses and predominantly spring applications results in monitoring being a lower priority than for some other pesticides.

Evolution, 1993, 8, 275.  H. Sas, Lake Restoration by Reduction of Nutrient Loading, Academia Verlag Richarz, Skt Augustin, 1989, 498 pp.  G. L. Phillips and R. Jackson, Verh. Int. Verien. Theor. Angew. , 1996, in press. 35 A. J. D. Ferguson et al. Nutrient Removal Intuition dictates that reducing nutrient inputs, particularly phosphorus, must reduce the supportable biomass. Relationships show that sustained response cannot be effected before it can be demonstrated (i) that nutrient is exhausted at a lower concentration of algae than the existing maxima and (ii) that in situ recycling is unable to make up the shortfall.

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


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