The impact of long-term fertilization on nitrogen leaching from double rice field of Hunan, China
| dc.contributor.author | Qin, X.B. | |
| dc.contributor.author | Li, Y.E. | |
| dc.contributor.author | Wan, Y.F. | |
| dc.contributor.author | Ji, X.H. | |
| dc.contributor.author | Liao, Y.L. | |
| dc.contributor.author | Liu, Y.T. | |
| dc.contributor.author | Wang, H. | |
| dc.contributor.author | Zentner, R. | |
| dc.contributor.author | Lin, J. | |
| dc.date.accessioned | 2018-08-03T14:08:54Z | |
| dc.date.available | 2018-08-03T14:08:54Z | |
| dc.date.issued | 2011-03-15 | |
| dc.description.abstract | To investigate the impact of long-term (1981-2007) fertilization on nitrogen leaching in soil solution of double rice field, a two years’ study was conducted in Hunan, China. Porous suction pipes was employed to extract soil solutions from different aquifers (in depth of 20-30 cm, 50-60 cm and 80-90 cm) of rice field to analyze the concentration of ammonium-N (NH4+–N) and nitrate-N (NO3––N) and the total loss of nitrogen. Results showed that nitrate-N was the primary form of N leaching in studied area. Significant seasonal variance as well vertical distribution of N leaching was found. NH4+–N in soil leachate mainly occurs in submerged situation before mid-season drainage, while NO3 ––N could primarily be found in situation of saturation especially in late growing stage. Concentration of NH4+–N decreased with the increasing sampling depth in range of 0-100 cm; whereas for the NO3––N, the vertical distribution was complicated: it increased in 0-60 cm and then decreased in 60-90 cm. Long-term incorporation with rice straw (NPKS) causes greater total N losses than applied chemical fertilizer only (NPK), and N leaching of CK (No fertilizer) was significantly less than these two treatments. For the studied area, comparatively higher N leaching losses occurred due to long-term fertilization, but with low potential hazards for nitrate contamination due to no extreme high NO3––N was found in all samples. | en_US |
| dc.description.version | Non-Peer Reviewed | |
| dc.identifier.uri | http://hdl.handle.net/10388/9286 | |
| dc.language.iso | en | en_US |
| dc.relation.ispartof | Soils and Crops Workshop | |
| dc.rights | Attribution-NonCommercial-NoDerivs 2.5 Canada | * |
| dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/2.5/ca/ | * |
| dc.subject | suction-cup | en_US |
| dc.subject | porous pipe | en_US |
| dc.subject | ammonium-N | en_US |
| dc.subject | nitrate-N | en_US |
| dc.title | The impact of long-term fertilization on nitrogen leaching from double rice field of Hunan, China | en_US |
| dc.type | Poster Presentation | en_US |