Pedosphere 15(2): 196--, 2005
ISSN 1002-0160/CN 32-1315/P
©2005 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Nitrate leaching in an irrigated wheat-maize rotation field in the north China plain |
ZHANG Yu-Ming1 , HU Chun-Sheng1, ZHANG Jia-Bao2, CHEN De-Li3 and LI Xiao-Xin1 |
1 Institute of Genetic and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang 050021 (China). E-mail: ymzhang@ms.sjziam.ac.cn
2 Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China)
3 Department of Resource Management and Horticulture, Institute of Land and Food Resource, the University of Melbourne, Parkville 3052, Victoria (Australia) |
| ABSTRACT |
| Soil water deep drainage and nitrate (NO3-) leaching losses below the root zone were investigated in a 1 ha wheat-maize rotation field under traditional agricultural management that local farmers generally follow in the North China Plain, using the soil water balance method and NO3-N concentration in suction samples. Water drainage, and NO3-N distribution and leaching losses exhibited pronounced spatial and temporal variability. Soil water deep drainage and NO3-N leaching loss mostly occurred during the summer maize growing season (rainy season), which coincided with irrigations and significant rainfall. On average, soil water deep drainage was 39 and 90 mm in the 1998/1999 and 1999/2000 cropping years, correspondingly, accounting for 10% and 19% of the total irrigation plus rainfall, respectively. The NO3-N leaching loss from soil and fertilizer N below the root zone ranged from 6 to 17 (averaging 12) and 30 to 84 (averaging 61) kg N ha-1 in 1998/1999 and 1999/2000, correspondingly, equivalent to 1.4%-4.1% and 7.3%-20.3% of N fertilizer applied, respectively. The results indicated that water and fertilizer inputs could be greatly reduced, thus improving water and nutrient use efficiency in this region. |
| Key Words: deep drainage, nitrate leaching, soil water |
| Citation: Zhang, Y. M., Hu, C. S., Zhang, J. B., Chen, D. L. and Li, X. X. 2005. Nitrate leaching in an irrigated wheat-maize rotation field in the north China plain. Pedosphere. 15(2): 196-. |
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