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The issue of high nitrate levels in fresh water is becoming increasingly important in New Zealand. This trial examined the effectiveness of using a nitrification inhibitor applied to a dairy farm pasture to reduce the amount of nitrate leached in coastal Taranaki soils. The product used (DCn) was a granular form of dicyandiamide. It was applied as recommended. Two 5 ha farmlets (Control and DCn) were established and managed for 2 years. Leachate samples were collected using 240 ceramic cups. Milk production, cow liveweight (Lwt), pasture growth and amount conserved were also measured. There was no significant difference between treatments for milk, fat and protein yield, fat and protein concentration, Lwt, body condition or pasture growth. Analysis of the leachate results showed that, except at the first samplings (when the DCn paddocks were highest), there was no difference in nitrate and Kjeldahl N content. The application of DCn did not increase milk or pasture production, nor did it decrease nitrate leaching. It is possible that N leachate measurements were compromised by the use of insufficient porous ceramic cups and that urine deposits over or near these cups could have reduced treatment effects. Current recommendations are that DCn be applied when soil temperature is <10°C (winter/spring). This has practical on-farm limitations and it may be preferable to apply DCn in early autumn to coincide with the period of greatest leaching risk.

Effectiveness of a nitrification inhibitor (DCn) on a Coastal Taranaki dairy farm