| Cite this article: | 潘晨,吴倩,杨宇,等.拔节期淹水条件下施氮量对玉米干物质积累和氮素吸收利用的影响[J].灌溉排水学报,0,():-. |
| PanChen,Wu Qian,YANG Yu,et al.拔节期淹水条件下施氮量对玉米干物质积累和氮素吸收利用的影响[J].灌溉排水学报,0,():-. |
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| Effects of nitrogen application rates on dry matter accumulation and nitrogen uptake and utilization of maize under waterlogging at the jointing stage |
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PanChen, Wu Qian, YANG Yu, LI Xia, HOU Jun, YANG Jun, LI Jifu, QI Dongliang
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Yangtze University
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| Abstract: |
| 【Objective】 To study the effects of nitrogen application rates on dry matter accumulation, distribution and nitrogen uptake and utilization of maize under waterlogging stress at the jointing stage, and to provide theoretical basis for stress tolerance cultivation for maize in waterlogged prone areas.【Method】 A field experiment was carried out with spring maize "Yidan 629" as the test crop. A split-plot experiment was designed; the main plot was water regime, which included well-water supply through the whole growth stage of maize (CS) and waterlogging for 6 days with 3-5 cm layer of water at the surface of soil at the V6 stage of maize (YS). The subplot was nitrogen (N) rate, which included 0, 90, 180, 270, and 360 kg/hm2, designated N0, N1, N2, N3 and N4, respectively. The leaf SPAD values , the accumulation of dry matter and nitrogen in different organs at the silking and maturity stages and the grain yield at the maturity stage were determined.【Result】The results showed that, compared to CS treatment, the YS treatment significantly decreased SPAD values, dry matter and nitrogen accumulation, nitrogen transport amount of vegetative organs, harvest index, nitrogen harvest index and nitrogen absorption and utilization efficiency in each N treatment. With the increase of N rates, the above mentioned parameters increased when N application rate ranged from N0 to N4 under the YS treatment, but the partial productivity of N fertilizer decreased, and the agronomic use efficiency of N fertilizer increased first and then decreased. The N4 could coordinating the contribution rate of nitrogen transport and absorption, but reduced the agronomic use efficiency of N fertilizer.【Conclusion】Increasing nitrogen fertilizer rates improve accumulation of dry matter and nitrogen of maize under waterlogging stress at the jointing stage, and also increase their allocation ratio to grain parts, while increase the possibility of soil nitrogen loss risk. |
| Key words: Nitrogen application; Waterlogging stress; Harvest index; Partial productivity of nitrogen fertilizer; Nitrogen uptake; Maize |
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