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Combining restricted grazing and nitrification inhibitors to reduce nitrogen leaching on New Zealand dairy farms

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doi: 10.2134/jeq2016.08.0325
Authors:Romera, Alvaro J.; Cichota, Rogerio; Beukes, Pierre C.; Gregorini, Pablo; Snow, Val O.; Vogeler, Iris
Author Affiliations:Primary:
DairyNZ, Hamilton, New Zealand
Other:
AgResearch, New Zealand
Volume Title:Journal of Environmental Quality
Source:and [Journal of Environmental Quality, 46(1), p.72-79. Publisher: American Society of Agronomy,] Crop Science Society of America, Soil Science Society of America, Madison, WI, United States. ISSN: 0047-2425
Publication Date:2017
Note:In English. 46 refs.; illus., incl. 4 tables
Summary:Intensification of pastoral dairy systems often means more nitrogen (N) leaching. A number of mitigation strategies have been proposed to reduce or reverse this trend. The main strategies focus on reducing the urinary N load onto pastures or reducing the rate of nitrification once the urine has been deposited. Restricted grazing is an example of the former and the use of nitrification inhibitors an example of the latter. A relevant concern is the cost effectiveness of these strategies, independently and jointly. To address this concern, we employed a modeling approach to estimate N leaching with and without the use of these mitigation options from a typical grazing dairy farm in New Zealand. Three restricted grazing options were modeled with and without a nitrification inhibitor (dicyandiamide, DCD) and the results were compared with a baseline farm (no restricted grazing, no inhibitor). Applying DCD twice a year, closely following the cows after an autumn and winter grazing round, has the potential to reduce annualized and farm-scale N leaching by ∼12%, whereas restricted grazing had leaching reductions ranging from 23 to 32%, depending on the timing of restricted grazing. Combining the two strategies resulted in leaching reductions of 31 to 40%. The abatement cost per kilogram of N leaching reduction was NZ[dollar]50 with DCD, NZ[dollar]32 to 37 for restricted grazing, and NZ[dollar]40 to 46 when the two were combined. For the range analyzed, all treatments indicated similar cost per percentage unit of mitigated N leaching, demonstrating that restricted grazing and nitrification inhibitors can be effective when used concurrently.
Subjects:Agricultural waste; Animal waste; Baseline studies; Controls; Depositional environment; Effluents; Environmental management; Fertilizers; Grasslands; Leaching; Mitigation; Models; Monitoring; Nitrification; Pollution; Soil pollution; Waste disposal; Waste management; Water resources; Australasia; New Zealand; North Island; Waikato Basin
Coordinates:S374000 S373500 E1751500 E1750500
Record ID:805371-5
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute.
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