A lysimeter study of nitrate leaching from grazed grassland as affected by a nitrification inhibitor, dicyandiamide, and relationships with ammonia oxidizing bacteria and archaea
HJ Di, KC Cameron, JP Shen, JZ He, CS Winefield
Soil Use and Management | WILEY | Published : 2009
Nitrate (NO3-) can contribute to surface water eutrophication and is deemed harmful to human health if present at high concentrations in the drinking water. In grazed grassland, most of the NO 3--N leaching occurs from animal urine-N returns. The objective of this study was to determine the effectiveness of a nitrification inhibitor, dicyandiamide (DCD), in decreasing NO3- leaching in three different soils from different regions of New Zealand under two different rainfall conditions (1260 mm and 2145 mm p.a.), and explore the relationships between NO3--N leaching loss and ammonia oxidizing bacteria (AOB) and ammonia oxidizing archaea (AOA). The DCD nitrification inhibitor was found to be hig..View full abstract
Awarded by Fonterra and Meat & Wool New Zealand
We thank the New Zealand Foundation for Research, Science and Technology (FRST), DairyNZ, Fonterra and Meat & Wool New Zealand under the Pastoral21 research programme (Environment; C10X0603) for funding, Trevor Hendry, Steve Moore, Neil Smith, Nigel Beale, Carole Barlow, Jie Lei and Roger Atkinson for technical assistance, and Dr Ross Monaghan of AgResearch, Invermay, for collaboration.