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Nitrate leaching is a process that happens naturally and occurs when nitrate leaves the soil in drainage water. Nitrogen and other nutrients are lost through leaching when soil is left bare for any period of time particularly over the winter when rainfall is high. When the N is utilised by the plant there isn’t a problem but once it gets into the ground water, into our rivers and streams it is then an important environmental indicator of pollutant. Catch crops can trap up to 60 – 120 kg N/Ha that would otherwise be at risk of leaching into our groundwater. In this clip, Fiona Doolan, Teagasc ASSAP Advisor tells us more. Visit www.teagasc.ie/waterqualityweek