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Inter-microbial competition for N and plant NO3− uptake rather than BNI determines soil net nitrification under intensively managed Brachiaria humidicola

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Title Inter-microbial competition for N and plant NO3− uptake rather than BNI determines soil net nitrification under intensively managed Brachiaria humidicola
 
Creator Egenolf, Konrad
Schad, Philipp
Arévalo, Ashly
Villegas, Daniel
Arango, Jacobo
Karwat, Hannes
Cadisch, Georg
Rasche, Frank
 
Subject nitrification
nitrification inhibitors
immobilization
nitrogen
nitrogen fixation
soil analysis
nitrificación
inhibidores de la nitrificación
inmovilización
nitrógeno
fijación del nitrógeno
análisis del suelo
brachiaria humidicola
 
Description Brachiaria humidicola (syn. Urochloa humidicola) has been acknowledged to control soil nitrification through release of nitrification inhibitors (NI), a phenomenon conceptualized as biological nitrification inhibition (BNI). Liming and N fertilization as features of agricultural intensification may suppress BNI performance, due to a decrease in NI exudation, increased NH3 availability and promotion of ammonia oxidizing bacteria (AOB) over archaea (AOA). A 2-year three-factorial pot trial was conducted to investigate the influence of soil pH and soil microbial background (ratio of archaea to bacteria) on BNI performance of B. humidicola. The study verified the capacity of B. humidicola to reduce net nitrification rates by 50 to 85% compared to the non-planted control, irrespective of soil pH and microbial background. The reduction of net nitrification, however, was largely dependent on microbial N immobilization and efficient plant N uptake. A reduction of gross nitrification could not be confirmed for the AOA dominated soil, but possibly contributed to reduced net nitrification rates in the AOB-dominated soil. However, this putative reduction of gross nitrification was attributed to plant-facilitated inter-microbial competition between bacterial heterotrophs and nitrifiers rather than BNI. It was concluded that BNI may play a dominant role in extensive B. humidicola pasture systems, while N immobilization and efficient plant N uptake may display the dominant factors controlling net nitrification rates under intensively managed B. humidicola.
 
Date 2022-04
2021-11-18T13:58:23Z
2021-11-18T13:58:23Z
 
Type Journal Article
 
Identifier Egenolf, K.; Schad, P.; Arévalo, A.; Villegas, D.; Arango, J.; Karwat, H.; Cadisch, G.; Rasche, F. (2021) Inter-microbial competition for N and plant NO3− uptake rather than BNI determines soil net nitrification under intensively managed Brachiaria humidicola. Biology and Fertility of Soils, Online first paper (13 November 2021) ISSN: 0178-2762
0178-2762
https://hdl.handle.net/10568/116148
https://doi.org/10.1007/s00374-021-01606-9
PII-LAM_LivestockPlus
 
Language en
 
Rights CC-BY-4.0
Open Access
 
Format application/pdf
 
Publisher Springer Science and Business Media LLC
 
Source Biology and Fertility of Soils