Response of Tartary Buckwheat to Nitrogen Application under Drought Stress

HE Peiyun; LONG Mengqian; FENG Jie; ZHOU Liang; HUANG Xiaoyan

doi:10.19303/j.issn.1008-0384.2021.08.004

Volume 36 Issue 8

Aug. 2021

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Fujian Journal of Agricultural Sciences > 2021 > 36(8): 892-898. > DOI: 10.19303/j.issn.1008-0384.2021.08.004

HE P Y, LONG M Q, FENG J, et al. Response of Tartary Buckwheat to Nitrogen Application under Drought Stress [J]. Fujian Journal of Agricultural Sciences，2021，36（8）：892−898. DOI: 10.19303/j.issn.1008-0384.2021.08.004

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Response of Tartary Buckwheat to Nitrogen Application under Drought Stress

1.
School of Life Science, Guizhou Normal University, Guiyang, Guizhou　550001, China
2.
Technological Research Center of Buckwheat Industry, Guizhou Normal University, Guiyang, Guizhou　550001, China

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Received Date: March 19, 2021
Revised Date: May 31, 2021
Available Online: August 09, 2021

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Abstract

Abstract

Objective Effects of varied nitrogen fertilization on the growth and grain yield of Tartary buckwheat Jinqiao 2 under draught stress were studied.
Method Agronomic characteristics, root morphology, and antioxidant enzyme activity of Tartary buckwheat plants under 8 treatments of varied combinations on water and nitrogen supplies were monitored. The treatments included (1) 0D-0N that provided normal water irrigation without added nitrogen fertilization, (2) 0D-LN that used a low nitrogen application with normal water supply, (3) 0D-MN that added a medium level of nitrogen under normal water supply, (4) 0D-HN that applied a high nitrogen fertilization with normal water supply, (5) HD-N0 that imposed a severe drought condition without nitrogen addition, (6) HD-N1 that used a low nitrogen application under severe drought, (7) HD-N2 that fertilized with medium level of nitrogen at severe drought condition, and (8) HD-N3 that supplied high nitrogen under severe drought.
Result Agronomically, morphologically, and enzymatically, the treated Tartary buckwheat was significantly affected by the treatments. Supplied with normally required water, the plants were increasingly affected by the increased nitrogen addition to reach a significantly higher peak under 0D-MN than the other treatment before declining (P＜0.05). Under drought, on the other hand, the plant physiochemical indices rose along with increasing nitrogen to maximize by HD-N3 which was significantly higher than other treatments (P＜0.05). With normal water supply, the yield of buckwheat peaked on 0D-MN, which was 2.90 times of that without the fertilization. In contrast, under draught, the yield increased 3.29 folds with a high nitrogen application.
Conclusion It appeared that nitrogen fertilization at a rate of 172.413 kg·hm⁻² under draught could not only improve the growth but also increase 1.76-fold on grain weight and 3.29-fold on production yield of Tartary buckwheat.
- Tartary buckwheat,
- drought stress,
- nitrogen fertilization,
- growth and development,
- enzymatic activity

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