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Nitrogen and Phosphorus Pollutants Removal from Rice Field Drainage with Ecological Agriculture Ditch: A Field Case

Lina Chen1,2,3,4, Wenshuo Zhang1, Junyi Tan5,*, Xiaohou Shao1, Yaliu Qiu7, Fangxiu Zhang2,6, Xiang Zhang2,6

1 College of Agricultural Engineering, Hohai University, Nanjing, 210098, China
2 Key Laboratory of Lower Yellow River Channel and Estuary Regulation, Ministry of Water Resources, Zhengzhou, 450003, China
3 Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China
4 College of Environment, Hohai University, Nanjing, 210098, China
5 Jiangsu Engineering Consulting Center, Nanjing, 210000, China
6 Yellow River Institute of Hydraulic Research, Zhengzhou, 450003, China
7Gaochun Water Resources Management Center, Nanjing, 211300, China

* Corresponding Author: Junyi Tan. Email:

Phyton-International Journal of Experimental Botany 2022, 91(12), 2827-2841.


Excessive nitrogen and phosphorus in agricultural drainage can cause a series of water environmental problems such as eutrophication of water bodies and non-point source pollution. By monitoring the water purification effect of a paddy ditch wetland in Gaochun, Nanjing, Jiangsu Province, we investigated the spatial and temporal distribution patterns of N and P pollutants in paddy drains during the whole reproductive period of rice. Then, the dynamic changes of nitrogen and phosphorus in time and space during the two processes of rainfall after basal fertilization and topdressing were analyzed after comparison. At last, the effect of the ditch wetland on nutrient purification and treatment mechanism, along with changing flow and concentration in paddy drains, was clarified. The results of this study showed that the concentrations of various nitrogen and phosphorus in the ditch basically reached the peak on the second and third days after the rainfall (5.98 mg/L for TN and 0.21 mg/L for TP), which provided a response time for effective control of nitrogen and phosphorus loss. The drainage can be purified by the ecological ditch, about 89.61%, 89.03%, 89.61%, 98.14%, and 79.05% of TN, NH4+-N, NO3-N, NO2-N, and TP decline. It is more effective than natural ditches for water purification with 80.59%, 40%, 12.07%, 91.06% and 18.42% removal rates, respectively. The results of the study can provide a theoretical basis for controlling agricultural non-point source pollution and improving the water environment of rivers and lakes scientifically.


Cite This Article

Chen, L., Zhang, W., Tan, J., Shao, X., Qiu, Y. et al. (2022). Nitrogen and Phosphorus Pollutants Removal from Rice Field Drainage with Ecological Agriculture Ditch: A Field Case. Phyton-International Journal of Experimental Botany, 91(12), 2827–2841.

This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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