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The effects of urine nitrogen application rate on nitrogen transformations in grassland soils

Published online by Cambridge University Press:  14 November 2019

C. Somers
Affiliation:
Johnstown Castle Research Centre, Teagasc, Wexford, Ireland School of Environmental Science, University of Ulster, Coleraine, UK
N. T. Girkin
Affiliation:
Johnstown Castle Research Centre, Teagasc, Wexford, Ireland Agriculture and Environmental Sciences, University of Nottingham, Nottingham, UK
B. Rippey
Affiliation:
School of Geography and Environmental Science, Ulster University, Coleraine, UK
G. J. Lanigan
Affiliation:
Johnstown Castle Research Centre, Teagasc, Wexford, Ireland
K. G. Richards*
Affiliation:
Johnstown Castle Research Centre, Teagasc, Wexford, Ireland
*
Author for correspondence: K. G. Richards, E-mail: [email protected]

Abstract

Urine is a critical nitrogen (N) input in temperate grazed grasslands and can drive substantial nitrous oxide (N2O) production in soils. However, it remains unclear how differences in the N input rate affect N2O fluxes and vary between different grassland soils. The effect of increasing urine N application on ammonium (NH4+), nitrite (NO2) and nitrate (NO3) concentrations and N2O production was tested in two grassland soils, a free-draining loam and an imperfectly drained sandy-loam. It was hypothesized that high-urine N application rates would lead to ammonia/ammonium (NH3/NH4+) accumulation influencing N transformation rates and N2O production which differ between grassland soils. Fresh cattle urine was applied at rates equivalent to 300 and 1000 kg N/ha in an aerobic incubation experiment. Soils were destructively sampled over 80 days to measure changes in inorganic-N and pH. The higher N addition rate was associated with elevated NH3 concentrations up to day 35 in soils, probably inhibiting NO2 to NO3 reduction. In contrast, there was no inhibition of nitrification in the 300 kg N/ha treatment. Cumulative N2O fluxes were greatest from the 300 kg N/ha treatment for the loam soil, but were greater for the sandy-loam under the 1000 kg N/ha treatment. The results also show that differences in soil properties, in particular carbon availability, can be important in regulating N transformation and N2O production. Collectively, these results demonstrate the proposed mechanism of nitrification inhibition at high-N input rates, driven by either high NH3/NH4 and/or increased levels of NH4HCO3 from urea hydrolysis.

Type
Crops and Soils Research Paper
Copyright
Copyright © Cambridge University Press 2019

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