Universität zu Köln

Chen, Hao, Zhou, Jun, Li, Bo ORCID: 0000-0003-3799-2018 and Xiong, Zhengqin ORCID: 0000-0003-4743-7325 (2019). Yield-scaled N2O emissions as affected by nitrification inhibitor and overdose fertilization under an intensively managed vegetable field: A three-year field study. Atmos. Environ., 206. S. 247 - 258. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 1873-2844

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Abstract

Vegetable fields exhibit contrasting characteristics of high nitrous oxide (N2O) emissions and low nitrogen use efficiency (NUE) compared with other croplands due to intensification. A three-year field experiment consisting of eleven successive vegetable crops was conducted to investigate the effects of wide range of overdose fertilization and chlorinated pyridine (CP, a nitrification inhibitor) on the N2O emissions, agronomic NUE, yield-scaled N2O emissions, marginal yield and marginal N2O emission. Five urea N input rates, combining without (U) or with CP (U-CP), were applied at 0, 587, 880 (the conventional N rate), 1173, and 1760 kg N ha(-1 )yr(-1). Results showed that N2O emission responses to N rate fitted well with cubic models in both the U and U-CP group treatments. Meanwhile, CP addition significantly reduced annual cumulative N2O emissions and the N2O emission factor from 39.1 to 79.7 kg N ha(-1) yr(-1) and 2.7-3.6% to 31.6-56.2 kg N ha(-1) yr(-1) and 1.5-2.2%, respectively, in relation to the U treatments at the same N rate. Moreover, CP addition significantly decreased the yield-scaled N2O emissions from 0.30 to 0.52 kg N t(-1) to 0.22-0.35 kg N t(-1) without obvious influence on vegetable yield. The 587 kg N ha(-1) yr(-1) was the optimal N rate for both the U and U-CP treatments as indicated by the agronomic NUE and yield-scaled N2O emissions. Thus, one third reduction of the conventional N fertilizer rate combined with CP was recommended to mitigate N2O emissions and maintain the yield for the sustainable development of intensified leafy vegetable production.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Chen, Hao UNSPECIFIED UNSPECIFIED UNSPECIFIED Zhou, Jun UNSPECIFIED UNSPECIFIED UNSPECIFIED Li, Bo UNSPECIFIED orcid.org/0000-0003-3799-2018 UNSPECIFIED Xiong, Zhengqin UNSPECIFIED orcid.org/0000-0003-4743-7325 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-147576
DOI:	10.1016/j.atmosenv.2019.02.036
Journal or Publication Title:	Atmos. Environ.
Volume:	206
Page Range:	S. 247 - 258
Date:	2019
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	1873-2844
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language NITROUS-OXIDE EMISSIONS; DICYANDIAMIDE DCD; NONLINEAR RESPONSE; USE EFFICIENCY; N MANAGEMENT; SOIL; SYSTEM; WHEAT; DMPP; DENITRIFICATION Multiple languages Environmental Sciences; Meteorology & Atmospheric Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/14757