Download Agricultural Pollution Problems and Practical Solutions by Graham Merrington, Dr Linton Winder Nfa, R. Parkinson, Mark PDF

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By Graham Merrington, Dr Linton Winder Nfa, R. Parkinson, Mark Redman, L. Winder

This complete textual content presents a concise evaluation of environmental difficulties as a result of agriculture (such as pesticide toxins and elevated nitrate degrees) and gives functional suggestions to them. it's good illustrated and encompasses a fully-referenced advent to the most modern agricultural pollutants concerns within the united kingdom. it is going to aid offer transparent, medical and technical knowing of crucial assets of agricultura toxins.

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Example text

Swedes and turnips) (Conway and Pretty, 1991). How much NO3− is in the harvested crop depends upon the amount of fertiliser N added, the crop characteristics and a variety of environmental factors, including season, sunlight and drought. , 1976). g. some meats and cheeses) to which NO3− and nitrite are routinely added as preservatives. , 1995). While organically grown vegetables have higher DM contents and lower NO3− concentrations than those receiving synthetic fertilisers, there is little difference in regard to the parameters which affect sensory assessment and nutrition (Isherwood, 2000).

For the moment, however, the gastric cancer debate is somewhat academic since international limits on NO3− levels have been implemented. The 1980 EC Directive on the Quality of Water Intended for Human Consumption, for example, set a ‘maximum allowable concentration’ of 50 mg NO3− l−1 and a guide level of 25 mg l−1. The WHO reviewed this limit in 1997 in the light of increased scientific evidence on the topic, yet maintained the 50 mg NO3−l−1 (Isherwood, 2000). Eutrophication Many surface waters, such as rivers and lakes, have a limited supply of N and P and are described as oligotrophic (nutrient poor, low biological productivity).

1998). Total N deposition in intensive livestock production area of the Netherlands may range from 40–80 kg N ha−1 year−1 (Whitehead, 2000). 1 The agricultural N cycle (adapted from Rowell, 1994). 1). Even in areas remote from intensive production agriculture deposition may still be in the region of 15 kg N ha−1 year−1 (Brady and Weil, 1999). Biological fixation Certain species of bacteria and algae are capable of reducing atmospheric N to NH3. The most important agricultural example is the Rhizobia bacteria that form a close symbiotic relationship with leguminous crops such as peas, beans and clover.

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