The short-lived inhibitory effect of Brachiaria humidicola on nitrous oxide emissions following sheep urine application in a highly nitrifying soil

A - Papers appearing in refereed journals

Ma, Y., Charteris, A. F., Loick, N., Cardenas, L. M., Zhipeng, S., Lopez, M., Chen, Q., Jones, D. L. and Chadwick, D. R. 2021. The short-lived inhibitory effect of Brachiaria humidicola on nitrous oxide emissions following sheep urine application in a highly nitrifying soil. Journal of Plant Nutrition and Soil Science. pp. 1-10. https://doi.org/10.1002/jpln.202000501

AuthorsMa, Y., Charteris, A. F., Loick, N., Cardenas, L. M., Zhipeng, S., Lopez, M., Chen, Q., Jones, D. L. and Chadwick, D. R.
Abstract

Background: Brachiaria humidicola (Bh) has the ability to produce biological nitrification inhibitors (NIs) and release NIs from the root to the soil.
Aims: To compare the effects of growing Bh with Brachiaria ruziziensis (Br, which is not able to produceNIs) on soil nitrogen (N) dynamics,Ngases and carbon dioxide (CO2) emissions and nitrifiers and denitrifiers following sheep urine application, a laboratory incubation was conducted in a He/O2 continuous flow denitrification system (DENIS). This incubation was conducted in the absence of light. Hence themeasured effects of Bh and Br on N cycling were the residual effect of biological NIs released into the soil prior to the incubation and released via root death.
Methods: The treatmentswere: (1) Bhwith water application (Bh+W); (2) Bh with sheep urine (Bh + U); (3) Br with water application (Br + W); (4) Br with sheep urine (Br + U).
Results: Results showed that soil NO3– concentration increased significantly in the soil with sheep urine application after the incubation. Soil nitrous oxide (N2O) and nitric oxide (NO) emissions increased immediately after the sheep urine application and peaked twice during the incubation. Cumulative emissions for the first peak were significantly lower from the Bh + U treatment (0.054 kg N ha–1) compared with the Br + U treatment (0.111 kg N ha–1), but no significant differences were observed in the total cumulative N2O and NO emissions between the Bh + U and Br + U treatment at the end of the incubation. Sheep urine addition did not affect the AOA, nirS and nosZ gene copies, but significantly increased the AOB gene copies after the incubation.
Conclusions: We conclude that the residual effect of Bh to mitigate N2O emissions in a highly nitrifying soil is short-lived.

KeywordsBrachiaria humidicola; Brachiaria ruziziensis; Nitrogen gas; Carbon dioxide; Nitrifier; Denitrifier
Year of Publication2021
JournalJournal of Plant Nutrition and Soil Science
Journal citationpp. 1-10
Digital Object Identifier (DOI)https://doi.org/10.1002/jpln.202000501
Web address (URL)https://onlinelibrary.wiley.com/doi/10.1002/jpln.202000501
Open accessPublished as ‘gold’ (paid) open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeS2N - Soil to Nutrition - Work package 1 (WP1) - Optimising nutrient flows and pools in the soil-plant-biota system
S2N - Soil to Nutrition - Work package 2 (WP2) - Adaptive management systems for improved efficiency and nutritional quality
Publisher's version
Copyright license
CC BY
Accepted author manuscript
Output statusPublished
Publication dates
Online27 Oct 2021
Publication process dates
Accepted18 Sep 2021
PublisherWiley
ISSN1436-8730

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