Effect of ploughing and reseeding of permanent grassland on soil N, N leaching and nitrous oxide emissions from a clay-loam soil

Necpálová, M. and Casey, I. and Humphreys, J. (2013) Effect of ploughing and reseeding of permanent grassland on soil N, N leaching and nitrous oxide emissions from a clay-loam soil. Nutrient Cycling in Agroecosystems, 95 (3). pp. 305-317. ISSN 1385-1314

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This study evaluated the effect of grassland renovation on soil total N, soluble N, N leaching to groundwater and nitrous oxide (N2O) fluxes from poorly drained clay loam soils on a dairy farm in Ireland. The experimental area was divided into six blocks. In June 2008, one paddock in each block was ploughed and reseeded, and subsequently compared with a permanent grassland paddock. Nitrogen in groundwater was determined in a dense network of piezometers. Soil total N along with soluble N assessed in KCl extracts were determined at three depths to 0.9 m. The N2O fluxes were measured using the static chamber technique. Renovation decreased topsoil total N and soluble organic N (P < 0.05) resulting in an average loss of 3.1 t and 13.4 kg N ha-1 in 1.7 years following renovation, respectively. Renovation increased nitrate and nitrite concentrations in groundwater (P < 0.0001), and N2O fluxes (P < 0.0001) for more than a year; the residual effect decreased with time. Although the N losses due to net mineralisation were high (>3 t N ha-1), the proportion lost via N leaching and N2O emissions was unsubstantial (27.11 kg N ha-1y-1) and represented only 4.8 and 0.49 % of the N input to renovated grassland, respectively. This was likely a result of soil inherent properties and anoxic status of the soils, which likely promoted complete denitrification. Since this study was a single site study and the measurements started only months after the renovation and were relatively short term, there is some uncertainty in the results.

Item Type: Article
Additional Information: Funding Information: Acknowledgments Authors would like to thank Kevin McNamara, Bill Keogh and Solohead farm staff for their assistance with the water and soil sampling and Denis Brennan (Teagasc Johnstown Castle) for the laboratory work. Research was supported by the department of Department of Agriculture, Fisheries and Food (Project RSF07-511).
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/1100/1102
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Depositing User: Admin SSL
Date Deposited: 19 Oct 2022 23:09
Last Modified: 29 Jul 2023 05:15
URI: http://repository-testing.wit.ie/id/eprint/4392

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