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| Effects of synergistic compound fertilizer combined with nitrogen reducing application on loss of nitrogen in paddy water |
| Received:November 14, 2019 |
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| KeyWord:synergistic compound fertilizer;reduction of nitrogen;paddy fields;nitrogen concentration;runoff;leakage |
| Author Name | Affiliation | E-mail | | JIANG Dong | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | ZHANG Li-gan | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | zhligan@ahau.edu.cn | | QI Yong-bo | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | ZHU Rong | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | CHENG Lin | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | SHU Qing | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | ZHANG Fu-yuan | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | GAO Hong-jian | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | |
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| Abstract: |
| To evaluate the environmental effects of synergistic compound fertilizer application in paddy fields, a field experiment was conducted to explore the effects of amino acid, humic acid, and alginic acid synergistic compound fertilizer combined with a nitrogen reducing application on the dynamic characteristics and loss of nitrogen in paddy water. Seven treatments were used:no fertilization(CK), no nitrogen application(PK), conventional fertilization(CF), conventional fertilization reducing nitrogen 20%(CR), humic acid synergistic compound fertilizer reducing nitrogen 20% (HR), amino acid synergistic compound fertilizer reducing nitrogen 20% (AR), and alginic acid synergistic compound fertilizer reducing nitrogen 20%(SR). The dynamic characteristics and loss of nitrogen in paddy water were analyzed by surface, runoff, and leakage water collected at different times during the rice-growing season. The results showed that:the peak values of the concentrations of TN and NH4+-N in the surface water reduced significantly by the treatments of AR, HR, and SR. The peak values of TN and NH4+-N concentrations were 37.1~49.7 mg·L-1 and 26.0~28.8 mg·L-1, respectively. Among four reducing nitrogen fertilization treatments, the peak values of TN and NH4+-N concentrations of the SR treatment were the lowest, which decreased 38.4% and 14.3% compared with the values in the CR treatment, respectively. There were no obvious differences in the other three nitrogen reducing fertilization treatments. One week after fertilization, the concentrations of TN and NH4+-N in the surface water gradually decreased to reach stability(approximately 15% of the maximum values). The concentrations of NO3--N in the surface water were generally low in each treatment and no obvious differences were observed. In soil depths of 0~20 cm, the lowest concentration of TN in the leakage water was observed in the SR treatment(16.5 mg·L-1), which decreased 60.8%, 50.1% and 54.0% compared to that in CR, HR and AR treatments, respectively. The TN concentration in leakage water decreased with the increase of soil depth, in which NH4+-N occupied a major proportion. The order of the loss rate was CF > CR > HR > AR > SR, in which the runoff of the SR treatment was the lowest(6.22 kg ·hm-2)and its loss rate decreased 58.5% compared with that of the CR treatment. Moreover, the nitrogen leakage was significantly reduced in the three synergistic compound fertilizer treatments. The order of the leaching rate was AR > CF > CR > HR > SR, in which the leakage of the SR treatment was the lowest(7.70 kg·hm-2); its leaching rate decreased 18.1% compared to that of the CR treatment. Furthermore, the total loss of nitrogen in the SR treatment was the lowest(13.9 kg·hm-2)and its loss decreased by 22.8% compared to that of the CR treatment. In conclusion, these findings show that the concentrations of the different nitrogen forms in the surface and leakage water were significantly influenced by the treatments of synergistic compound fertilizer combined with a nitrogen reducing application, which can be an effective way to alleviate the risk of nitrogen loss through paddy water, especially by the treatment of an alginic acid synergistic compound fertilizer combined with a nitrogen reducing application. |
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