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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 NO 3 ‐N pollution of aquifers. Direct measurements of changes in profile NO 3 ‐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.
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Cameron et al. (1984) studied this question.
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