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| DOI：10.13522/j.cnki.ggps.2021249 |
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| Effects of Nitrogen Application on Dry Matter Accumulation in Maize Waterlogged at Jointing Stage |
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PAN Chen, WU Qian, YANG Yu, et al
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College of Agriculture, Yangtze University, Jingzhou 434025, China
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| Abstract: |
| 【Objective】Spring maize in central China often experiences temporary waterlogging during its growing season, and the purpose of this study is to investigate the efficacy of nitrogen application in reliving the impact of waterlogging at jointing stage and its consequence for dry matter accumulation and nitrogen uptake and utilization by the crop.【Method】Maize variety of Yidan 629 was used as the model plant. The experiment was designed by split-plot method, and consisted of two water treatments: sufficient irrigation and drainage during the whole growth season (CS), waterlogging the crop at the jointing stage for six days by keeping 3~5 cm depth of water on the soil surface (YS). Added to each water treatment were five nitrogen applications: 0 (N0), 90 (N1), 180 (N2), 270 (N3), and 360 kg/hm2 (N4). During the experiment, we measured leaf SPAD, dry matter accumulation, nitrogen in different organs at the silking and maturity stages, as well as the grain yield.【Result】Compared to CS, YS significantly reduced SPAD, dry matter, nitrogen uptake and translocation from vegetative organs to the grain, harvest index, nitrogen harvest index and nitrogen use efficiency, regardless of N applications. When the crop was subjected to waterlogging, increasing N application improved dry matter and nitrogen accumulation, nitrogen translocation from vegetative organs to grain, harvest index, nitrogen harvest index and nitrogen use efficiency by 5.2%~41.8%, while reducing the partial productivity of N fertilizer by 41.1%~59.4%. With the increase in N application, the agronomic use efficiency of the N fertilizer increased first followed by a decline.【Conclusion】Increasing nitrogen application when the crop was under waterlogging at the jointing stage can improve dry matter accumulation, nitrogen uptake, as well as nitrogen translocation to the grains, but at a risk of nitrogen leaching. |
| Key words: nitrogen application rate; waterlogging stress; harvest index; partial productivity of nitrogen fertilizer; nitrogen uptake; maize |
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