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| The amounts of nitrogen and phosphorus losses from a vegetable field via runoff |
| Received:February 19, 2022 Revised:May 10, 2022 |
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| KeyWord:vegetable;nitrogen;phosphorus;loss;surface runoff |
| Author Name | Affiliation | E-mail | | PAN Xuming | School of Environmental & Safety Engineering, Changzhou University, Changzhou 213164, China | | | DING Miao | School of Environmental & Safety Engineering, Changzhou University, Changzhou 213164, China | | | ZHOU Yucheng | School of Environmental & Safety Engineering, Changzhou University, Changzhou 213164, China | | | LIU Jianguo | School of Environmental & Safety Engineering, Changzhou University, Changzhou 213164, China | liujianguo@cczu.edu.cn |
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| Abstract: |
| To investigate the amounts of nitrogen and phosphorus losses via surface runoff during a vegetable production cycle and the distributions of the loss ways and times, an in-situ monitoring site was established in the main vegetable production area of Changzhou, China. The inputs and outputs of water, nitrogen, and phosphorus in the vegetable field were monitored. The results indicate that the inputs of nitrogen and phosphorus via rainfall and irrigation during the experiment period were 21.77 kg·hm-2 and 1.18 kg·hm-2, respectively. The outputs of nitrogen and phosphorus via runoff water and runoff sediment were 28.91 kg·hm-2 and 3.10 kg·hm-2, respectively. Therefore, the net losses of nitrogen and phosphorus from the vegetable field（deduction of nitrogen and phosphorus inputs from the outputs）were 7.15 kg· hm-2 and 1.93 kg·hm-2, respectively. Regarding the ways of nitrogen and phosphorus outputs, runoff water was predominant. The amounts of nitrogen and phosphorus outputs via runoff water accounted for 91.63% and 62.63% of the total nitrogen and phosphorus outputs, respectively. Nitrogen and phosphorus outputs were predominant during June and July. The amounts of nitrogen and phosphorus outputs in June and July accounted for 72.54% and 73.61% of total nitrogen and phosphorus outputs, respectively, and the output amounts in June were similar to those in July. |
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