Zhang, Kefeng, Greenwood, Duncan J. , Spracklen, William P., Rahn, C. (Clive), Hammond, John P., White, Philip J. and Burns, Ian G. (2010) A universal agro-hydrological model for water and nitrogen cycles in the soil–crop system SMCR_N: critical update and further validation. Agricultural Water Management, Vol.97 (No.10). pp. 1411-1422. doi:10.1016/j.agwat.2010.03.007 ISSN 0378-3774.

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Abstract

Agro-hydrological models have widely been used for optimizing resources use and minimizing environmental consequences in agriculture. SMCR_N is a recently developed sophisticated model which simulates crop response to nitrogen fertilizer for a wide range of crops, and the associated leaching of nitrate from arable soils. In this paper, we describe the improvements of this model by replacing the existing approximate hydrological cascade algorithm with a new simple and explicit algorithm for the basic soil water flow equation, which not only enhanced the model performance in hydrological simulation, but also was essential to extend the model application to the situations where the capillary flow is important. As a result, the updated SMCR_N model could be used for more accurate study of water dynamics in the soil–crop system. The success of the model update was demonstrated by the simulated results that the updated model consistently out-performed the original model in drainage simulations and in predicting time course soil water content in different layers in the soil–wheat system. Tests of the updated SMCR_N model against data from 4 field crop experiments showed that crop nitrogen offtakes and soil mineral nitrogen in the top 90 cm were in a good agreement with the measured values, indicating that the model could make more reliable predictions of nitrogen fate in the crop–soil system, and thus provides a useful platform to assess the impacts of nitrogen fertilizer on crop yield and nitrogen leaching from different production systems.

Item Type:	Journal Article
Subjects:	S Agriculture > SB Plant culture
Divisions:	Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- ) > Warwick HRI (2004-2010)
Library of Congress Subject Headings (LCSH):	Water in agriculture, Water-supply, Agricultural -- Great Britain, Crops and nitrogen, Crops and soils, Agriculture -- Mathematical models
Journal or Publication Title:	Agricultural Water Management
Publisher:	Elsevier BV
ISSN:	0378-3774
Official Date:	1 April 2010
Dates:	Date Event 1 April 2010 Published
Volume:	Vol.97
Number:	No.10
Page Range:	pp. 1411-1422
DOI:	10.1016/j.agwat.2010.03.007
Status:	Peer Reviewed
Access rights to Published version:	Open Access (Creative Commons)
Funder:	Great Britain. Dept. for Environment, Food & Rural Affairs (DEFRA), European Commission (EC)
Grant number:	QLK5-CT-2002-01100, HH3507SFV

Data sourced from Thomson Reuters' Web of Knowledge

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