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Leaching of N compounds from swards used for dairying that are N based and irrigated with dirty water/slurry.
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1998-12-01
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Richards, K., Ryan, M., Coxon, C., Leaching of N compounds from swards used for dairying that are N based and irrigated with dirty water/slurry, End of Project Reports, Teagasc, 1998.
Abstract
A study was carried out to investigate nitrate leaching on a dairy farm
in Co. Cork. The farm had a history of high nitrate-N in borehole
waters and the study aimed to elucidate the causative factors for
this. Physical and chemical data regarding the soils, the hydrology,
and the N input/output balances were determined and collated.
Results showed that nitrate-N concentrations > the EU maximum
allowable concentration (MAC) of 11.3 mg/l for drinking water
occurred in soil drainage from the light textured soils studied due to a
large imbalance between N inputs and outputs. High fertiliser N
usage, animal manure and dirty water applications, atmospheric N
depositions and soil organic N mineralisation in combination
produced these results . While it is recognised that nitrate leaching
will vary in amount from year to year the lessons from the study are
clear - light textured soils that are used for intensive dairying and
which receive high inputs of N are prone to release drainage water
high in nitrate.