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- Title
Nitrification is the key process determining N use efficiency in paddy soils.
- Authors
Wang, Jing; Zhao, Ying; Zhang, Jinbo; Zhao, Wei; Müller, Christoph; Cai, Zucong
- Abstract
Nitrogen (N) fertilizer use efficiency (NUE) in flooded paddy fields is relatively low. Many N fertilizer management options have been proposed to enhance NUE and minimize environmental damage. However, few investigations are focusing on the role of the characteristics of soil N transformations in regulating NUE and N losses in paddy fields. In this study, we test the role of soil N transformations on NUE and N losses under rice growth conditions in two paddy soils collected from Jiangxi (JX) and Sichuan (SC) in China. The N recoveries of applied 15N either as nitrate or ammonium in plant and soil, and N losses estimated by 15N balance were investigated in rice pot experiments using a 15N tracing technique. The results showed that gross nitrification rates in soil collected from JX were much lower than those in soils collected from SC either at 60% water holding capacity (WHC) or rice growth (flooding) conditions, which could be due to the difference in soil pH. The
- Subjects
PADDY fields; RICE soils; NITROGEN fertilizers; NITRIFICATION; PLANT-soil relationships; MANAGEMENT
- Publication
Journal of Plant Nutrition & Soil Science, 2017, Vol 180, Issue 6, p648
- ISSN
1436-8730
- Publication type
Article
- DOI
10.1002/jpln.201700130