| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 2414760 | Agriculture, Ecosystems & Environment | 2011 | 7 Pages |
The present study aimed to investigate the potential ammonia (NH3) emission from flag leaves of paddy rice (Oryza sativa L. cv. Koshihikari). The study was conducted at a paddy field in central Japan that was designed as a free-air CO2 enrichment (FACE) facility for paddy rice. A dynamic chamber method was used to measure the potential NH3 emissions. The air concentrations of NH3 at two heights (2 and 6 m from the ground surface) were measured using a filter-pack method, and the exchange fluxes of NH3 of the whole paddy field were calculated using a gradient method. The flag leaves showed potential NH3 emissions of 25–38 ng N cm−2 h−1 in the daytime from the heading to the maturity stages, and they showed potentials of approximately 22 ng N cm−2 h−1, even in the nighttime, at the heading and mid-ripening stages. The exchange fluxes of NH3 of the whole paddy field in the daytime were net emissions of 0.9–3.9 g N ha−1 h−1 whereas the exchange fluxes of NH3 in the nighttime were approximately zero.
► Flag leaf of paddy rice has a potential of ammonia emission. ► Potentials were significant in the daytime. ► Potentials were found even at night. ► Potentials in the daytime were different among growth stages. ► The paddy field acted as a net source of atmospheric ammonia.
