Pedosphere 19(4): 515--522, 2009
ISSN 1002-0160/CN 32-1315/P
©2009 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Combining ridge with no-tillage in lowland rice-based cropping system: Long-term effect on soil and rice yield |
JIANG Xian-Jun and XIE De-Ti |
| College of Resources and Environment, Southwest University, 216 Tiansheng Road, Beibei, Chongqing 400716 (China) |
| ABSTRACT |
| A tillage method of combining ridge with no-tillage (RNT) was employed in lowland rice-based cropping system to study the long-term effects of RNT on soil profile pattern, soil water stable aggregate distribution, nutrients stratification and yields of rice and post-rice crops. After flooded paddy field (FPF) was practiced with RNT for a long time, soil profile changed from G to A-P-G, and horizon G was shifted to a deeper position in the profile. Also the proportion of macroaggregate (> 2 mm) increased, whereas the proportion of silt and clay (< 0.053 mm) decreased under RNT, indicating a better soil structure that will prevent erosion. RNT helped to control leaching and significantly improved total N, P, K and organic matter in soil. The highest crop yields were found under RNT system every year, and total crop yields were higher under conventional paddy-upland rotation tillage (CR) than under FPF, except in 2003 and 2006 when serious drought occurred. RNT was proven to be a better tillage method for lowland rice-based cropping system. |
| Key Words: aggregate-size distribution, conservative tillage, flooded paddy field, soil profile pattern |
| Citation: Jiang, X. J. and Xie, D. T. 2009. Combining ridge with no-tillage in lowland rice-based cropping system: Long-term effect on soil and rice yield. Pedosphere. 19(4): 515-522. |
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