| Cite this article: | 赵金科,徐学欣,曲文凯,等.不同时期水氮处理对滴灌冬小麦 旗叶光合特性、保护酶活性及产量的影响[J].灌溉排水学报,2022,():-. |
| ZHAO Jinke,XU Xuexin,QU Wenkai,et al.不同时期水氮处理对滴灌冬小麦 旗叶光合特性、保护酶活性及产量的影响[J].灌溉排水学报,2022,():-. |
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| Effects of Water - nitrogen Treatment on Photosynthetic Characteristics, Protective Enzyme Activity and Yield of Flag Leaves of Drip-irrigated Winter Wheat at Different Stages |
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ZHAO Jinke, XU Xuexin, QU Wenkai, LIU Shuai, XU Yufan, MENG Fangang, JIA Jing, ZHAO Changxing
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Shandong Provincial Key Laboratory of Dry Farming Agricultural Technology,College of Agriculture,Qingdao Agricultural University
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| Abstract: |
| Abstract:【Objective】The objective is to explore high-efficiency water and fertilizer measures and clarify the effects of the water-nitrogen coupling under on-demand drip irrigation.【Method】A field experiment was conducted with N1 (180 kg/hm2) and N2 (210 kg/hm2) two N application amounts, and S2 (jointing, anthesis), S3 (jointing, anthesis, filling) two irrigation-stage combinations, two factors constitute treatments with the traditional irrigation and fertilization method (240 kg/hm2 total nitrogen application, border irrigation at jointing and anthesis stages, with topdressing N 150 kg/hm2 at jointing stage) as control (CK) to study the characteristics of photosynthesis and senescence of winter wheat flag leaf and yield formation and water-nitrogen use efficiency under water and nitrogen coupling with two years of 2019 and 2021. High-yielding wheat variety (Jimai 22) was selected to be studied. 【Result】The results showed that the drip irrigation water-nitrogen treatment at different stages increased the LAI, SPAD, net photosynthetic rate (Pn), stomatal conductance (Gs) and transpiration rate (Tr) of winter wheat flag leaves, and increased the activities of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) while reducing the amount of malondialdehyde (MDA), and the grain filling rate, 1000 grain quality, yield and water-fertilizer use efficiency were also significantly improved compared with CK. Under drip irrigation conditions, the nitrogen application rate increased from N1 to N2 at the same drip irrigation frequency, and there was no significant change in irrigation water use efficiency (IUE) but significant decrease in nitrogen fertilizer partial productivity (PFPn); Under the same nitrogen application rate, the IUE of S3 was reduced compared with S2, but the 1000 grain quality and yield were significantly improved, also PFPn but no significantly.【Conclusion】Under the condition of precise drip irrigation from 0~20 cm soil layer to 100% relative water content, the decline of photosynthetic characteristics and senescence characteristics of flag leaf were effectively delayed, the grain weight was enhanced caused grain filling rate being promoted significantly in the middle-late anthesis by the N1S3 (nitrogen application rate of 180 kg/hm2, 3 times irrigation at jointing, anthesis and filling). Compared with CK, grain quality increased by 5.3%, yield increased by 6.2%, nitrogen fertilizer partial productivity (PFPn) and irrigation water use efficiency (IUE) increased by 42.1% and 44.8%, respectively. Considering crop growth traits, yield, IUE and PFPn, N1S3 is the best water and fertilizer management mode, which can be used as a water-nitrogen saving irrigation fertilization method for drip irrigation and fertilizer to reach high-yield in the eastern part of North China Plain.
Key Words: drip irrigation integration of water and fertilizer; winter wheat; photosynthetic characteristics; senescence characteristics; yield |
| Key words: drip irrigation integration of water and fertilizer; winter wheat; photosynthetic characteristics; senescence characteristics; yield |
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