Herbage nitrogen yield in grass and grass-white clover swards receiving zero nitrogen - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Conference Poster Year : 2024

Herbage nitrogen yield in grass and grass-white clover swards receiving zero nitrogen

Abstract

Nitrogen fertilisers are a major contributor to ammonia and greenhouse gas emissions through their inputs in grazed herbage systems. Nitrogen use efficiency can be increased through reduced nitrogen inputs to grazing systems but herbage and animal production needs to be maintained. The objective of this study was to evaluate the herbage nitrogen yield from grass-only and grass-white clover herbage receiving zero nitrogen inputs. The study consisted of zero nitrogen plots established in 2020 and 2021 within grazed paddocks of either grass or grass-white clover swards at Teagasc, Clonakilty Agricultural College, Cork, and Teagasc, Moorepark, Fermoy, Cork, Ireland in 2021. The plots received no chemical or organic N and were not grazed for the duration of the grazing season. Plots were relocated within paddock between grazing seasons in Clonakilty. The grass-only sward plots yielded 7404 kg DM ha–1 per year and 193 kg N ha–1. The grass-white clover swards yielded significantly higher herbage (9837 kg DM ha–1 per year) and N (291 kg N ha–1) than the grass-only swards (P < 0.001). The results provide an indication of background N mineralization of 193 kg N ha–1 and biological N fixation of 98 kg N ha–1 within grass-only and grass-clover swards receiving zero nitrogen.
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Dates and versions

hal-04626087 , version 1 (26-06-2024)

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  • HAL Id : hal-04626087 , version 1

Cite

Áine Murray, Luc Delaby, W. Burchill, E. Fitzpatrick, Brian Mccarthy, et al.. Herbage nitrogen yield in grass and grass-white clover swards receiving zero nitrogen. 30. General meeting of the European Grassland Federation (EGF2024), Jun 2024, Leeuwarden, Netherlands. Dutch-Flemish Society for Grassland and Fodder Crops (NVWV), Grassland Science in Eruope, 29, pp.111-113, 2024, Why grasslands?. ⟨hal-04626087⟩

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