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Dicyandiamide (DCD) is an effective mitigation option for decreasing nitrate-nitrogen (NO3-N) losses in drainage water from New Zealand pastures. This study determined the relative effect of DCD on decreasing NO3-N losses from simulated sheep or cattle urine patches applied to a winter forage crop. Lysimeters were collected from a site in North Otago (Mottled Fragic Pallic Timaru silt loam). DCD was applied one day following the removal of crop herbage (triticale) and urine was added at rates pertinent to cattle and sheep. Loads of NO3-N in leachate during the study period (May 2007 until May 2008) were three times greater from lysimeters receiving cattle urine (~300 kg/ ha) than those receiving sheep urine. DCD applied to lysimeters that received cattle urine decreased NO3-N leaching losses for 4 months after application, resulting in a net 39% decrease in N lost during the study. No significant effect was evident when the application of DCD followed sheep urine, suggesting that DCD only offers benefits for intensive cattle systems, but this requires further investigation.

The effect of DCD on nitrate leaching losses from a winter forage crop receiving applications of sheep or cattle urine