Nitrogen fertilizer rate affects root exudation, the rhizosphere microbiome and nitrogen-use-efficiency of maize

Nitrogen fertilizer rate affects root exudation, the rhizosphere microbiome and... •High N rates increase the maize root exudation and total abundance of soil bacteria.•All taxa mapped to genes associated with the N cycle (e.g., nifD, nosZ) significantly increased with N rate.•The pmoA-amoA group was the most responsive, increasing approx. 30-fold at the highest N rate.•The decline in NUE at high N rates cannot be solely attributed to reductions in plant root biomass.•The declining NUE is best explained by an increase in N immobilization by soil bacteria. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Applied Soil Ecology Elsevier

Nitrogen fertilizer rate affects root exudation, the rhizosphere microbiome and nitrogen-use-efficiency of maize

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Publisher
Elsevier
Copyright
Copyright © 2016 Elsevier Ltd
ISSN
0929-1393
D.O.I.
10.1016/j.apsoil.2016.07.009
Publisher site
See Article on Publisher Site

Abstract

•High N rates increase the maize root exudation and total abundance of soil bacteria.•All taxa mapped to genes associated with the N cycle (e.g., nifD, nosZ) significantly increased with N rate.•The pmoA-amoA group was the most responsive, increasing approx. 30-fold at the highest N rate.•The decline in NUE at high N rates cannot be solely attributed to reductions in plant root biomass.•The declining NUE is best explained by an increase in N immobilization by soil bacteria.

Journal

Applied Soil EcologyElsevier

Published: Nov 1, 2016

References

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