Nitrogen uptake and utilization of two maize hybrids with contrasting nitrogen use efficiencies depending on fertilization amount
文献类型： 外文期刊
作者： Shao, Guodong 1 ; Cheng, Hao 1 ; Dai, Hongcui 2 ; Zhang, Hui 1 ; Ai, Juanjuan 3 ; Liu, Kaichang 1 ; Li, Zongxin 1 ; Zamanian, Kazem 5 ; Qian, Xin 1 ;
作者机构： 1.Shandong Acad Agr Sci, Maize Res Inst, Jinan, Peoples R China
2.Natl Engn Res Ctr Wheat & Maize, Jinan, Peoples R China
3.Univ Tubingen, Dept Geosci, Geobiosphere Interact, Tubingen, Germany
4.Shandong Acad Agr Sci, Crop Res Inst, Jinan, Peoples R China
5.Leibniz Univ Hannover, Inst Soil Sci, Hannover, Germany
6.Nanjing Univ Informat Sci & Technol, Sch Geog Sci, Nanjing, Peoples R China
关键词： Grain yield; nitrogen fate; topdressing; N-15 recovery; nitrogen metabolism
期刊名称：ARCHIVES OF AGRONOMY AND SOIL SCIENCE （ 影响因子：2.242； 五年影响因子：2.76 ）
ISSN： 0365-0340
年卷期：
页码：
收录情况： SCI
摘要： Splitting nitrogen (N) application is beneficial for achieving higher grain yields and N use efficiency (NUE), but the responses of N utilization efficiency of different maize cultivars to top-dressing N fertilizer rates are still unclear. This study investigated the effects of fertilization managements on N uptake and utilization derived from topdressing fertilizers of maize hybrids (Ludan981 and Denghai605) with contrasting NUEs. The N fate derived from topdressing fertilizer was determined using the N-15 tracing method. Grain yields, dry matter and N accumulation of both maize hybrids were significantly increased under low N levels but decreased under high N levels. Under N-deficient and excess conditions, Denghai605 had higher NUE than Ludan981. The N rates of topdressing significantly affected N uptake and utilization, but no difference was detected between two maize hybrids, and excessive N use led to higher rates of N loss and residual in soil. The N metabolism enzyme activities did not differ between the two maize hybrids. Our findings suggest optimized N management strategies by adjusting topdressing N application rate and timing are necessary to increase NUE and to minimize environmental costs in maize cropping system.
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