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Journal of Chemistry
Volume 2015, Article ID 913470, 9 pages
http://dx.doi.org/10.1155/2015/913470
Research Article

Potential of Controlled Irrigation and Drainage for Reducing Nitrogen Emission from Rice Paddies in Southern China

1Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern China, Ministry of Education, College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
2School of Economics and Management, Nanjing University of Information Science & Technology, Nanjing 210044, China

Received 11 December 2014; Revised 26 January 2015; Accepted 26 January 2015

Academic Editor: Jun Wu

Copyright © 2015 Guang-cheng Shao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The effect of controlled irrigation and drainage (CID) at different growth stages of rice on nitrogen (N) from rice paddy was studied. Submergence at different stages was imposed in specially designed experimental tanks in 2009 and 2010 based on alternate wetting and drying technology (AWD, the control, CK). Treatments include CID treatment at tiller stage (T1), jointing-booting stage (T2), panicle initiation stage (T3), and milky stage (T4). Results showed that fertilization could significantly increase the concentration of -N and TN in surface water but had a little influence on -N. The concentrations of -N and -N in surface water increased at first and then decreased after fertilization, while the concentrations of -N and TN in groundwater kept on being relatively stable. Compared to CK, CID significantly increased the concentration of -N in surface water at four stages. However, it reduced the concentration of -N. Consistent with the reduction of drainage, CID at four stages could significantly decrease the amount of -N and -N losses by runoff in relation to CK.