Potential Aquifer Pollution from Nitrate Leaching Following the Plowing of Temporary Grassland1
- K. C. Cameron and
- A. Wild2
An investigation of the amounts and concentrations of nitrate released following the plowing of temporary grassland confirmed that, potentially at least, this practice forms a major source of NO3-N pollution of aquifers. Direct measurements of changes in profile NO3-N distributions at two sites show that a total of up to about 100 kg N ha−1 was leached over two winters after fall mineralization following plowing. Solution nitrate concentrations were in excess of the World Health Organization limits for drinking water. The amount of N mineralized was related to the total soil N. The average rate of leaching through the Chalk soils studied in southern England was about 1 m/yr.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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