Responses of Rice Yield, N Uptake, NH<sub>3</sub> and N<sub>2</sub>O Losses from Reclaimed Saline Soils to Varied N Inputs
It is of agronomic importance to apply nitrogen (N), but it has high environmental risks in reclaimed saline soils. Therefore, we should apply N fertilizer at an appropriate rate to increase crop yield but decrease N losses. In this soil column experiment, rice yield, N uptake, and ammonia (NH<su...
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MDPI AG
2023-06-01
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| Online Access: | https://www.mdpi.com/2223-7747/12/13/2446 |
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| author | Si Wu Zhenhua Zhang Haijun Sun Haibo Hu |
| author_facet | Si Wu Zhenhua Zhang Haijun Sun Haibo Hu |
| author_sort | Si Wu |
| collection | DOAJ |
| description | It is of agronomic importance to apply nitrogen (N), but it has high environmental risks in reclaimed saline soils. Therefore, we should apply N fertilizer at an appropriate rate to increase crop yield but decrease N losses. In this soil column experiment, rice yield, N uptake, and ammonia (NH<sub>3</sub>) and nitrous oxide (N<sub>2</sub>O) losses were measured in four treatments with no N application (control) and with N applications of 160, 200, and 240 kg/ha (N160, N200, and N240, respectively). The results show that grain yield, spike number, and thousand-kernel weight increased with increases in N application rate, but there was no significant difference in grain yield between N200 and N240. However, the kernels per spike increased first and then decreased with the increase in N application, of which N200 was recorded to have the highest kernels per spike value, which was 16.8 and 9.8% higher than those of N160 and N240, respectively. Total NH<sub>3</sub> volatilization of the rice season increased with increasing N input, especially during the first and second supplementary fertilization stages. The NH<sub>4</sub><sup>+</sup>-N concentration of overlying water was relatively lower under the N200 treatment in these two stages, and the yield-scaled NH<sub>3</sub> volatilization and the emission factor were the lowest in N200, which were 26.2–27.8% and 4.0–21.0% lower than those of N160 and N240, respectively. Among the three N-applied treatments, N<sub>2</sub>O losses and the emission factor as well as the yield-scaled N<sub>2</sub>O emissions were the lowest under the N200 treatment, which had 34.7% and 78.9% lower N<sub>2</sub>O emissions and 57.8% and 83.5% lower emission factors than those of the N160 and N240 treatments, respectively. Moreover, the gene copies of AOA and AOB <i>amoA</i>, <i>nirS</i>, and <i>nirK</i> in cultivated layer soils all reached the minimum under the N200 treatment. According to the comprehensive effects of N fertilizer on rice grain yield and NH<sub>3</sub> and N<sub>2</sub>O losses, we recommend applying 200 kg/ha to reclaimed saline soil to ensure crop yield and reduce N losses. |
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| spelling | doaj.art-1ea31ba4045648cf893ef8426c0a36a62023-11-18T17:17:36ZengMDPI AGPlants2223-77472023-06-011213244610.3390/plants12132446Responses of Rice Yield, N Uptake, NH<sub>3</sub> and N<sub>2</sub>O Losses from Reclaimed Saline Soils to Varied N InputsSi Wu0Zhenhua Zhang1Haijun Sun2Haibo Hu3Co-Innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037, ChinaJiangsu Key Laboratory for Bioresource of Saline Soils, School of Wetlands, Yancheng Teachers University, Yancheng 224007, ChinaCo-Innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037, ChinaCo-Innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037, ChinaIt is of agronomic importance to apply nitrogen (N), but it has high environmental risks in reclaimed saline soils. Therefore, we should apply N fertilizer at an appropriate rate to increase crop yield but decrease N losses. In this soil column experiment, rice yield, N uptake, and ammonia (NH<sub>3</sub>) and nitrous oxide (N<sub>2</sub>O) losses were measured in four treatments with no N application (control) and with N applications of 160, 200, and 240 kg/ha (N160, N200, and N240, respectively). The results show that grain yield, spike number, and thousand-kernel weight increased with increases in N application rate, but there was no significant difference in grain yield between N200 and N240. However, the kernels per spike increased first and then decreased with the increase in N application, of which N200 was recorded to have the highest kernels per spike value, which was 16.8 and 9.8% higher than those of N160 and N240, respectively. Total NH<sub>3</sub> volatilization of the rice season increased with increasing N input, especially during the first and second supplementary fertilization stages. The NH<sub>4</sub><sup>+</sup>-N concentration of overlying water was relatively lower under the N200 treatment in these two stages, and the yield-scaled NH<sub>3</sub> volatilization and the emission factor were the lowest in N200, which were 26.2–27.8% and 4.0–21.0% lower than those of N160 and N240, respectively. Among the three N-applied treatments, N<sub>2</sub>O losses and the emission factor as well as the yield-scaled N<sub>2</sub>O emissions were the lowest under the N200 treatment, which had 34.7% and 78.9% lower N<sub>2</sub>O emissions and 57.8% and 83.5% lower emission factors than those of the N160 and N240 treatments, respectively. Moreover, the gene copies of AOA and AOB <i>amoA</i>, <i>nirS</i>, and <i>nirK</i> in cultivated layer soils all reached the minimum under the N200 treatment. According to the comprehensive effects of N fertilizer on rice grain yield and NH<sub>3</sub> and N<sub>2</sub>O losses, we recommend applying 200 kg/ha to reclaimed saline soil to ensure crop yield and reduce N losses.https://www.mdpi.com/2223-7747/12/13/2446saline soilN fertilizerrice productionNH<sub>3</sub> volatilizationN<sub>2</sub>O emissions |
| spellingShingle | Si Wu Zhenhua Zhang Haijun Sun Haibo Hu Responses of Rice Yield, N Uptake, NH<sub>3</sub> and N<sub>2</sub>O Losses from Reclaimed Saline Soils to Varied N Inputs Plants saline soil N fertilizer rice production NH<sub>3</sub> volatilization N<sub>2</sub>O emissions |
| title | Responses of Rice Yield, N Uptake, NH<sub>3</sub> and N<sub>2</sub>O Losses from Reclaimed Saline Soils to Varied N Inputs |
| title_full | Responses of Rice Yield, N Uptake, NH<sub>3</sub> and N<sub>2</sub>O Losses from Reclaimed Saline Soils to Varied N Inputs |
| title_fullStr | Responses of Rice Yield, N Uptake, NH<sub>3</sub> and N<sub>2</sub>O Losses from Reclaimed Saline Soils to Varied N Inputs |
| title_full_unstemmed | Responses of Rice Yield, N Uptake, NH<sub>3</sub> and N<sub>2</sub>O Losses from Reclaimed Saline Soils to Varied N Inputs |
| title_short | Responses of Rice Yield, N Uptake, NH<sub>3</sub> and N<sub>2</sub>O Losses from Reclaimed Saline Soils to Varied N Inputs |
| title_sort | responses of rice yield n uptake nh sub 3 sub and n sub 2 sub o losses from reclaimed saline soils to varied n inputs |
| topic | saline soil N fertilizer rice production NH<sub>3</sub> volatilization N<sub>2</sub>O emissions |
| url | https://www.mdpi.com/2223-7747/12/13/2446 |
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