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| Responses of ammonia volatilization and grain yield to nitrogen reduction with synergistic compound fertilizer in a paddy field |
| Received:January 25, 2021 |
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| KeyWord:ammonia volatilization;synergistic compound fertilizer;nitrogen reduction;yield;paddy field |
| Author Name | Affiliation | E-mail | | ZHU Rong | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | LIU Lili | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | QI Yongbo | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | MU Jing | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention/School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | 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 Ligan | 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 | | GAO Hongjian | 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: |
| A field experiment was performed to explore the effects of nitrogen reduction application of three compound fertilizers(humic acid, amino acid, and alginic acid synergistic compound fertilizer) on ammonia volatilization, nitrogen use efficiency, and grain yield to provide a scientific basis for exploring the efficient utilization of compound fertilizer and evaluating its environmental effects. The field experiment was performed in a paddy field located in Zhenjiang Institute of Agricultural Sciences. Six treatments were set up, namely without fertilization(CK), conventional fertilization(CF), conventional fertilization with 20% nitrogen reduction(CR), humic acid synergistic compound fertilizer with 20% nitrogen reduction(HR), amino acid synergistic compound fertilizer with 20% nitrogen reduction (AR), and alginic acid synergistic compound fertilizer with 20% nitrogen reduction(SR). The ammonia volatilization flux after fertilization was measured by the closed intermittent ventilation method. Rice yield, nitrogen uptake, and nitrogen use efficiency were measured at the rice maturity stage. The results showed that ammonia volatilization mainly occurred after the application of basal fertilizer and tillering fertilizer. Compared with the CF treatment, the CR, HR, AR, and SR treatments significantly reduced the total ammonia volatilization loss by 38.9%~54.7%. Compared with that of the CR treatment, the total ammonia volatilization loss of the AR and SR treatments decreased by 20.5% and 25.8%, respectively. The concentration of NH4+-N in the surface water was an important factor in ammonia volatilization, which was significantly reduced by the nitrogen reduction fertilization treatments. The average NH4+-N concentration in the surface water of the three synergistic compound fertilizer treatments decreased by 5.5%~18.7% compared with that of the CR treatment. Under the nitrogen reduction conditions, the plant nitrogen uptake under the synergistic compound fertilizer treatments(HR, AR, and SR) was significantly increased by 20.0%~31.8% compared with that in the CR treatment. Moreover, the nitrogen use efficiencies of the HR, AR, and SR treatments were significantly higher than those of the CF and CR treatments. The grain yields of the three synergistic compound fertilizer treatments(HR, AR, and SR) were not significantly reduced compared with that of the CF treatment. Under the same nitrogen reduction level, the yields of the three synergistic compound fertilizer treatments(HR, AR, and SR) were significantly higher than that of the CR treatment(increased by 4.4%~4.8%). These findings show that ammonia volatilization is significantly decreased by the treatments of synergistic compound fertilizer combined with nitrogen reduction application, whereas the grain yield is not differentially affected, especially by the treatment of amino acid and alginic acid synergistic compound fertilizer combined with nitrogen reduction application. |
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