| Cite this article: | 曹和平,蒋静,翟登攀,等.施氮量对土壤水氮盐分布和玉米生长及产量的影响[J].灌溉排水学报,2022,():-. |
| caoheping,jiangjing,zhaidengpan,et al.施氮量对土壤水氮盐分布和玉米生长及产量的影响[J].灌溉排水学报,2022,():-. |
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| Effects of Nitrogen Application Rate on Soil Water, Nitrogen and Salt Distribution and Maize Growth and Yield |
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caoheping1, jiangjing1, zhaidengpan2, zhangchaobo1
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1.Taiyuan University of Technology;2.Zhongshui North survey, design and Research Co., Ltd.
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| Abstract: |
| 【Objective】Nitrogen is an important factor affecting maize growth and yield. The purpose of this paper is to explore the appropriate amount of nitrogen fertilizer for maize in salinized soil.【Method】The experiment was conducted from May to September in 2019. Maize was potted in the shelter of the experimental site of College of Water Resources Science and Engineering, Taiyuan University of Technology. Four nitrogen application levels were set, N0 (no nitrogen application), N1 (225 kg/hm2), N2 (275 kg/hm2) and N3 (325 kg/hm2).【Result】The results showed that nitrogen application could significantly affect the distribution of water, nitrogen and salt in soil, and the volumetric water content of 0~40 cm soil layer decreased significantly (p < 0.05) with increasing of nitrogen application rate. The soil electrical conductivity increased with the increase of nitrogen application rate in each measured period. With the advancement of maize growth, the soil electrical conductivity from jointing stage to tasseling stage increased by 0.968~1.542 dS/m compared with that at seedling stage, and decreased by 4.740~5.471 dS/m at mature stage compared with tasseling stage. The contents of nitrate and ammonium nitrogen in soil decreased gradually with the growth of maize, and increased with the increase of nitrogen application rate. Nitrogen application significantly promoted the growth of maize and improved the water consumption and water use efficiency of maize, and all indexes increased with the increase of nitrogen application. There was no significant difference between N2 and N3 treatments (p > 0.05). Compared with N3 treatment, N2 treatment saved 50 kg/hm2 of fertilizer, and the partial productivity of nitrogen fertilizer was 3.4 kg/kg higher (p < 0.05).【Conclusion】Considering the effects of different nitrogen application rates on soil water, nitrogen and salt distribution, maize growth index and water consumption characteristics, it is concluded that the more suitable nitrogen application rate for maize in salinized soil in this area is 275 kg/hm2. |
| Key words: Yield; water use efficiency; soil conductivity; nitrate nitrogen; ammonium nitrogen |
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