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Flaws in the current method for calculating methane emissions during dairy manure management in New Zealand

Pratt, C. and Shilton, A. and Chung, M. L. and Guieysse, B. (2014) Flaws in the current method for calculating methane emissions during dairy manure management in New Zealand. New Zealand Journal of Agricultural Research, 57 (3). pp. 244-249. ISSN 0028-8233

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Article Link(s): http://dx.doi.org/10.1080/00288233.2014.911751

Abstract

New Zealand's Greenhouse Gas Inventory (the NZ Inventory) currently estimates methane (CH4) emissions from anaerobic dairy effluent ponds by: (1) determining the total pond volume across New Zealand; (2) dividing this volume by depth to obtain the total pond surface area; and (3) multiplying this area by an observational average CH4 flux. Unfortunately, a mathematically erroneous determination of pond volume has led to an imbalanced equation and a geometry error was made when scaling-up the observational CH4 flux. Furthermore, even if these errors are corrected, the nationwide estimate still hinges on field data from a study that used a debatable method to measure pond CH4 emissions at a single site, as well as a potentially inaccurate estimation of the amount of organic waste anaerobically treated. The development of a new methodology is therefore critically needed.

Item Type:Article
Business groups:Animal Science
Subjects:Animal culture > Cattle > Dairying
Agriculture > Agriculture (General) > Agriculture and the environment
Deposited On:21 Jan 2015 05:25
Last Modified:21 Jan 2015 05:25

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