Nitrogen losses and greenhouse gas emissions under different N and water management in a subtropical double-season rice cropping system
Abstract
© 2017 Nitrogen non-point pollution and greenhouse gas (GHG) emission are major challenges in rice production. This study examined options for both economic and environmental sustainability through optimizing water and N management. Field experiments were conducted to examine the crop yields, N use efficiency (NUE), greenhouse gas emissions, N losses under different N and water management. There were four treatments: zero N input with farmer's water management (N0), farmer's N and water management (FP), optimized N management with farmer's water management (OPTN) and optimized N management with alternate wetting and drying irrigation (OPTN + AWD). Grain yields in OPTN and OPTN + AWD treatments increased by 13.0–17.3% compared with FP. Ammonia volatilization (AV) was the primary pathway for N loss for all treatments and accounted for over 50% of the total losses. N losses mainly occurred before mid-tillering. N losses through AV, leaching and surface runoff in OPTN were reduced by 18.9–51.6% compared with FP. OPTN + AWD further reduced N losses from surface runoff and leaching by 39.1% and 6.2% in early rice season, and by 46.7% and 23.5% in late rice season, respectively, compared with OPTN. The CH4 emissions in OPTN + AWD were 20.4–45.4% lower than in OPTN and FP. Total global warming potential of CH4 and N2O was the lowest in OPTN + AWD. On-farm comparison confirmed that N loss through runoff in OPTN + AWD was reduced by over 40% as compared with FP. OPTN and OPTN + AWD significantly increased grain yield by 6.7–13.9%. These results indicated that optimizing water and N management can be a simple and effective approach for enhancing yield with reduced environmental footprints.
Source or Periodical Title
Science of the Total Environment
ISSN
489697
Page
46-57
Document Type
Article
Subject
Methane emission, Nitrogen losses, Nitrous oxide emission, South China
Recommended Citation
Liang, Kaiming; Zhong, Xuhua; Huang, Nongrong; Lampayan, Rubenito M.; Liu, Yanzhuo; Pan, Junfeng; Peng, Bilin; Hu, Xiangyu; and Fu, Youqiang, "Nitrogen losses and greenhouse gas emissions under different N and water management in a subtropical double-season rice cropping system" (2021). Journal Article. 1233.
https://www.ukdr.uplb.edu.ph/journal-articles/1233