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RESEARCH ARTICLE
Contents Vol 46(7)

N2O and N2 emissions from pasture and wetland soils with and without amendments of nitrate, lime and zeolite under laboratory condition

M. Zaman A D , M. L. Nguyen B and S. Saggar C
+ Author Affiliations
- Author Affiliations

A Summit-Quinphos (NZ) Ltd, Private Bag 3029, Waikato mail Centre 3240, Hamilton, New Zealand.

B Soil and Water Management & Crop Nutrition, Joint FAO/IAEA Division of Nuclear Techniques in Food & Agriculture, PO Box 100, A-1400 Vienna, Austria.

C Landcare Research, Private Bag 11052, Palmerston North, New Zealand.

D Corresponding author. Email: zamanm_99@yahoo.com

Australian Journal of Soil Research 46(7) 526-534 https://doi.org/10.1071/SR07218
Submitted: 21 November 2007  Accepted: 10 April 2008   Published: 8 October 2008

Abstract

Pasture and wetland soils are regarded as the major source of nitrous oxide (N2O) and dinitrogen (N2) emissions as they receive regular inputs of N from various sources. To understand the factors affecting N2O and N2 emissions and their ratio as influenced by soil amendments (zeolite or lime), we conducted laboratory experiments using 10-L plastic containers at 25°C for 28 days. Soil samples (0–0.1 m soil depth) collected from pasture and adjacent wetland sites were treated with nitrate-N (NO3–) at 200 kg N/ha with and without added lime or zeolite. Nitrous oxide and N2 emissions were measured periodically from soil subsamples collected in 1-L gas jars using acetylene (C2H2) inhibition technique, and soil ammonium (NH4+) and NO3– concentrations were determined to assess the changes in N transformation. Soil NO3–-N disappeared relatively faster in wetland soil than that in pasture soil. In the presence of added NO3–, wetland soils emitted significantly more N2O and N2 than pasture soils, while the reverse trend was observed in the absence of NO3–. Total N2O emitted as percentage of the applied N was 25% for wetland and 5.7% for pasture soils. Total N2 emissions expressed as a percentage of the applied N from wetland and pasture soils were 5–9% and 0.29–0.74%, respectively. Higher N2O and N2 emissions and lower N2O : N2 ratios from wetland soils than pasture soils were probably due to the higher water content and greater availability of soluble C in wetland. Zeolite applied to wetland soils reduced N2O emissions but had little effect on N2O emissions from pasture soils. Liming appeared to exacerbate N2O emissions from fertilised lands and treatment wetlands and shift the balance between N2O and N2, and may be considered as one of the potential management tools to reduce the amount of fertiliser N moving from pasture and wetland into waterways.

Additional keywords: acetylene reduction, lime, mitigation, nitrate, N2O, N2, pasture, wetland, zeolite.


Acknowledgment

We thank Summit Quinphos (NZ) Ltd and NIWA for funding this project. We also thank our NIWA Hamilton staff members Kerry Costley and James Sukius for their technical assistance in the field and laboratory work. We also thank Professor Art Gold, Department of Natural Resources Sciences, Coastal Institute in Kingston, University of Rhode Island, Kingston, RI, for his help in designing the experiment and positive comments in preparing this manuscript.


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