Case Study on Nitrogen and Phosphorus Emissions from Paddy Field in Taihu Region |
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| Authors: | HY Guo JG Zhu XR Wang ZH Wu Z Zhang |
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| Institution: | (1) State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, PR, China;(2) State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 210093, PR, China;(3) State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, PR, China |
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| Abstract: | The agricultural non-point source pollution by nitrogen (N) and phosphorus (P) loss from typical paddy soil (whitish soil, Bai Tu in Chinese) in the Taihu Lake region was investigated through a case study. Results shown that the net load of nutrients from white soil is 34.1 kg ha–1 for total nitrogen (TN), distributed as 19.4 kg ha–1, in the rice season and 14.7 kg ha–1in the wheat season, and for total phosphorus (TP) 1.75 kg ha–1, distributed as 1.16 kg ha–1 in the rice season and 0.58 kg ha–1 in the wheat season. The major chemical species of N loss is different in the two seasons. NH4-N is main the form in the rice season (53% of TN). NO3-N is the main form in wheat season (46% of TN). Particle-P is the main form in both seasons, (about 56% of TP). The nutrient loss varied with time of the year. The main loss of nutrients happened in the 10 days after planting, 64% of TN and 42% of TP loss, respectively. Rainfall and fertilizer application are the key factors which influence nitrogen and phosphorus loss from arable land, especially rainfall events shortly after fertilizer application. So it is very important to improve the field management of the nutrients and water during the early days of planting. |
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| Keywords: | fertilizer non-point source pollution paddy field Taihu lake region total nitrogen total phosphorus |
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