Modeling nitrogen and water management effects in a wheat-maize double-cropping system

Fang, Q; Ma, L; Yu, Q; Malone, RW; Saseendran, SA; Ahuja, LR

Modeling nitrogen and water management effects in a wheat-maize double-cropping system

Fang, Q Ma, L Yu, Q

Malone, RW Saseendran, SA Ahuja, LR

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Publication Type:: Journal Article
Citation:: Journal of Environmental Quality, 2008, 37 (6), pp. 2232 - 2242
Issue Date:: 2008-11-01

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Field	Value	Language
dc.contributor.author	Fang, Q	en_US
dc.contributor.author	Ma, L	en_US
dc.contributor.author	Yu, Q https://orcid.org/0000-0001-6950-1821	en_US
dc.contributor.author	Malone, RW	en_US
dc.contributor.author	Saseendran, SA	en_US
dc.contributor.author	Ahuja, LR	en_US
dc.date.issued	2008-11-01	en_US
dc.identifier.citation	Journal of Environmental Quality, 2008, 37 (6), pp. 2232 - 2242	en_US
dc.identifier.issn	0047-2425	en_US
dc.identifier.uri	http://hdl.handle.net/10453/8553
dc.description.abstract	Excessive N and water use in agriculture causes environmental degradation and can potentially jeopardize the sustainability of the system. A field study was conducted from 2000 to 2002 to study the effects of four N treatments (0, 100, 200, and 300 kg N ha-1 per crop) on a wheat (Triticum aestivum L.) and maize (Zea mays L.) double cropping system under 70 ± 15% field capacity in the North China Plain (NCP). The root zone water quality model (RZWQM), with the crop estimation through resource and environment synthesis (CERES) plant growth modules incorporated, was evaluated for its simulation of crop production, soil water, and N leaching in the double cropping system. Soil water content, biomass, and grain yield were better simulated with normalized root mean square errors (NRMSE, RMSE divided by mean observed value) from 0.11 to 0.15 than soil NO3-N and plant N uptake that had NRMSE from 0.19 to 0.43 across these treatments. The long-term simulation with historical weather data showed that, at 200 kg N ha-1 per crop application rate, auto-irrigation triggered at 50% of the field capacity and recharged to 60% field capacity in the 0-to 50-cm soil profile were adequate for obtaining acceptable yield levels in this intensified double cropping system. Results also showed potential savings of more than 30% of the current N application rates per crop from 300 to 200 kg N ha-1, which could reduce about 60% of the N leaching without compromising crop yields. Copyright © 2008 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America. All rights reserved.	en_US
dc.relation.ispartof	Journal of Environmental Quality	en_US
dc.relation.isbasedon	10.2134/jeq2007.0601	en_US
dc.subject.classification	Agronomy & Agriculture	en_US
dc.subject.mesh	Triticum	en_US
dc.subject.mesh	Zea mays	en_US
dc.subject.mesh	Nitrogen	en_US
dc.subject.mesh	Conservation of Natural Resources	en_US
dc.subject.mesh	Water Supply	en_US
dc.subject.mesh	Models, Theoretical	en_US
dc.subject.mesh	Time Factors	en_US
dc.subject.mesh	Agriculture	en_US
dc.title	Modeling nitrogen and water management effects in a wheat-maize double-cropping system	en_US
dc.type	Journal Article
utslib.citation.volume	6	en_US
utslib.citation.volume	37	en_US
utslib.for	0703 Crop and Pasture Production	en_US
utslib.for	04 Earth Sciences	en_US
utslib.for	05 Environmental Sciences	en_US
utslib.for	06 Biological Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Life Sciences
utslib.copyright.status	closed_access
pubs.issue	6	en_US
pubs.publication-status	Published	en_US
pubs.volume	37	en_US

Abstract:

Excessive N and water use in agriculture causes environmental degradation and can potentially jeopardize the sustainability of the system. A field study was conducted from 2000 to 2002 to study the effects of four N treatments (0, 100, 200, and 300 kg N ha-1 per crop) on a wheat (Triticum aestivum L.) and maize (Zea mays L.) double cropping system under 70 ± 15% field capacity in the North China Plain (NCP). The root zone water quality model (RZWQM), with the crop estimation through resource and environment synthesis (CERES) plant growth modules incorporated, was evaluated for its simulation of crop production, soil water, and N leaching in the double cropping system. Soil water content, biomass, and grain yield were better simulated with normalized root mean square errors (NRMSE, RMSE divided by mean observed value) from 0.11 to 0.15 than soil NO3-N and plant N uptake that had NRMSE from 0.19 to 0.43 across these treatments. The long-term simulation with historical weather data showed that, at 200 kg N ha-1 per crop application rate, auto-irrigation triggered at 50% of the field capacity and recharged to 60% field capacity in the 0-to 50-cm soil profile were adequate for obtaining acceptable yield levels in this intensified double cropping system. Results also showed potential savings of more than 30% of the current N application rates per crop from 300 to 200 kg N ha-1, which could reduce about 60% of the N leaching without compromising crop yields. Copyright © 2008 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America. All rights reserved.

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http://hdl.handle.net/10453/8553