Tillage depth influence on soil nitrogen distribution and availability in a rice lowland
Previous studies using artificial barriers at selected depths have shown the importance of N supply from soil below 15 cm to rice (Oryza sativa L.). Subsoil N availability and its use by wetland rice, however, have not been evaluated under normal field conditions. We examined distribution and availa...
| Main Authors: | , , |
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| Format: | Journal Article |
| Language: | Inglés |
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Wiley
1996
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| Online Access: | https://hdl.handle.net/10568/167296 |
| _version_ | 1855518022202032128 |
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| author | Kundu, D.K. Ladha, J.K. Lapitan-de Guzman, E. |
| author_browse | Kundu, D.K. Ladha, J.K. Lapitan-de Guzman, E. |
| author_facet | Kundu, D.K. Ladha, J.K. Lapitan-de Guzman, E. |
| author_sort | Kundu, D.K. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Previous studies using artificial barriers at selected depths have shown the importance of N supply from soil below 15 cm to rice (Oryza sativa L.). Subsoil N availability and its use by wetland rice, however, have not been evaluated under normal field conditions. We examined distribution and availability of 2 M KCl‐extractable N in 0‐ to 15‐, 15‐ to 30‐, and 30‐ to 45‐cm layers of a submerged Alfisol during three successive crop seasons, as influenced by the depth of tillage imposed at the outset of the experiment. Mineral N availability in the 0‐ to 45‐cm profile and rice N uptake in the first season were significantly higher (20–25 kg ha−1 higher mineral N and 16–18 kg ha−1 higher crop N uptake) with tillage to a depth of 40 cm than to 15 or 25 cm, the increased N supply originating largely from the 15‐ to 30‐cm layer. In two following seasons, tillage to 40 cm gave the highest mineral N in the subsoil layers, and increased rice N uptake by 12 to 14 kg ha−1, compared with tillage to 15 cm. The beneficial effects of deep tillage were attributed to the elimination of mechanical impedence to root proliferation, and lower susceptibility of subsoil N to various loss mechanisms. Initial and final analyses of Kjeldahl N in the soil profile indicated no adverse effect of practicing 40‐cm‐deep tillage once in three seasons on soil N fertility. Further study is needed to determine optimum depth and frequency of primary tillage for different soil types to enhance N use efficiency. |
| format | Journal Article |
| id | CGSpace167296 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1996 |
| publishDateRange | 1996 |
| publishDateSort | 1996 |
| publisher | Wiley |
| publisherStr | Wiley |
| record_format | dspace |
| spelling | CGSpace1672962025-05-14T10:39:32Z Tillage depth influence on soil nitrogen distribution and availability in a rice lowland Kundu, D.K. Ladha, J.K. Lapitan-de Guzman, E. tillage nitrogen availability soil lowland rice Previous studies using artificial barriers at selected depths have shown the importance of N supply from soil below 15 cm to rice (Oryza sativa L.). Subsoil N availability and its use by wetland rice, however, have not been evaluated under normal field conditions. We examined distribution and availability of 2 M KCl‐extractable N in 0‐ to 15‐, 15‐ to 30‐, and 30‐ to 45‐cm layers of a submerged Alfisol during three successive crop seasons, as influenced by the depth of tillage imposed at the outset of the experiment. Mineral N availability in the 0‐ to 45‐cm profile and rice N uptake in the first season were significantly higher (20–25 kg ha−1 higher mineral N and 16–18 kg ha−1 higher crop N uptake) with tillage to a depth of 40 cm than to 15 or 25 cm, the increased N supply originating largely from the 15‐ to 30‐cm layer. In two following seasons, tillage to 40 cm gave the highest mineral N in the subsoil layers, and increased rice N uptake by 12 to 14 kg ha−1, compared with tillage to 15 cm. The beneficial effects of deep tillage were attributed to the elimination of mechanical impedence to root proliferation, and lower susceptibility of subsoil N to various loss mechanisms. Initial and final analyses of Kjeldahl N in the soil profile indicated no adverse effect of practicing 40‐cm‐deep tillage once in three seasons on soil N fertility. Further study is needed to determine optimum depth and frequency of primary tillage for different soil types to enhance N use efficiency. 1996-07 2024-12-19T12:57:14Z 2024-12-19T12:57:14Z Journal Article https://hdl.handle.net/10568/167296 en Wiley Kundu, D. K.; Ladha, J. K. and Lapitan‐de Guzman, E. 1996. Tillage depth influence on soil nitrogen distribution and availability in a rice lowland. Soil Science Soc of Amer J, Volume 60 no. 4 p. 1153-1159 |
| spellingShingle | tillage nitrogen availability soil lowland rice Kundu, D.K. Ladha, J.K. Lapitan-de Guzman, E. Tillage depth influence on soil nitrogen distribution and availability in a rice lowland |
| title | Tillage depth influence on soil nitrogen distribution and availability in a rice lowland |
| title_full | Tillage depth influence on soil nitrogen distribution and availability in a rice lowland |
| title_fullStr | Tillage depth influence on soil nitrogen distribution and availability in a rice lowland |
| title_full_unstemmed | Tillage depth influence on soil nitrogen distribution and availability in a rice lowland |
| title_short | Tillage depth influence on soil nitrogen distribution and availability in a rice lowland |
| title_sort | tillage depth influence on soil nitrogen distribution and availability in a rice lowland |
| topic | tillage nitrogen availability soil lowland rice |
| url | https://hdl.handle.net/10568/167296 |
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