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| Effects of foliar spraying with selenium on nitrogen metabolism and yield of rice grown under different nitrogen levels in cold regions |
| Received:August 28, 2024 |
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| KeyWord:selenium;nitrogen fertilizer;rice;cold area;nitrogen metabolism |
| Author Name | Affiliation | | LIU Chunmei | Heilongjiang Bayi Agricultural University, College of Agriculture, Daqing 163319, China | | DONG Xiwen | Heilongjiang Bayi Agricultural University, College of Agriculture, Daqing 163319, China | | YAN Yuehui | Heilongjiang Bayi Agricultural University, College of Agriculture, Daqing 163319, China | | CHEN Ruiyang | Heilongjiang Bayi Agricultural University, College of Agriculture, Daqing 163319, China | | BEN Haotong | Heilongjiang Bayi Agricultural University, College of Agriculture, Daqing 163319, China | | HUANG Chenwei | Heilongjiang Bayi Agricultural University, College of Agriculture, Daqing 163319, China | | XU Wenzheng | Heilongjiang Bayi Agricultural University, College of Agriculture, Daqing 163319, China |
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| Abstract: |
| To investigate the regulation of key nitrogen metabolism enzyme activities in rice under varying nitrogen levels and to examine the effects of foliar applications of two selenium fertilizers on rice growth and development, as well as the influence of foliar application of selenium on rice nitrogen uptake, accumulation and yield under different nitrogen levels. A two-factor random pot experiment was conducted with "Kenjing 8" rice variety as the research object, and four nitrogen levels were set, namely N0（no nitrogen application）, N1 （75 kg·hm-2）, N2（100 kg·hm-2）, N3（125 kg·hm-2）, 2 selenium fertilizer varieties, including Se1（inorganic selenium）and Se2（organic selenium）, the concentrations were both 100 mg·kg-1, and 12 varieties were treated with water spray compared with Se0. Results indicate that N3Se1 treatment significantly increased nitrogen content in all rice organs compared to N0Se1 treatment, 20 days after heading, nitrogen content in rice leaves, stems, roots, and panicles increased significantly by 37.69%, 39.39%, 26.55%, and 35.23%, respectively. This contributes to rice growth and development as well as nitrogen uptake and accumulation to a certain extent. At identical nitrogen levels, foliar application of different selenium fertilizers showed that Se1 treatment exhibited significantly higher key nitrogen metabolism enzyme activities than Se2 treatment. 20 days after heading, the activities of nitrate reductase（NR）, glutamine synthetase（GS）, and glutamate synthase（GOGAT）in rice leaves increased significantly by 6.39%-43.85%, 3.64%-5.97%, and 1.21%-100.00%, respectively. Under different nitrogen levels, the N3Se1 treatment yield the highest rice production, increasing by 199.63% compared to the N0Se1 treatment. At the same nitrogen application rate, Se1 treatment showed a significant yield-enhancing effect, exceeding the Se2 treatment by 4.73% to 22.39%. Under conditions of nitrogen-selenium interaction, rice yield can be enhanced. In summary, exogenous selenium application at different nitrogen levels can influence rice nitrogen metabolism. Specifically, at a nitrogen rate of 125 kg·hm-2, inorganic selenium applied during the booting stage significantly enhanced the activity of key nitrogen metabolism enzymes and increased yield in the‘Kenjing 8’rice variety. |
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