Evaluation of variable-rate nitrogen recommendation of winter wheat based on SPAD chlorophyll meter measurement
文献类型： 外文期刊
作者： Zhao Chunjiang 1 ; Jiang Aning 1 ; Huang Wenjiang 1 ; Liu Keli 2 ; Liu Liangyun 1 ; Wang Jihua 1 ;
作者机构： 1.Natl Engn Res Ctr Informat Technol Agr, Beijing 100097, Peoples R China
2.Inner Mongolia Agr Univ Huhhot, Hohhot 010019, Peoples R China
关键词： precision agriculture; SPAD readings; variable rate nitrogen application (VRN); winter wheat
期刊名称：NEW ZEALAND JOURNAL OF AGRICULTURAL RESEARCH （ 影响因子：2.161； 五年影响因子：1.988 ）
ISSN： 0028-8233
年卷期： 2007 年 50 卷 5 期
页码：
收录情况： SCI
摘要： To develop a time-Specific and timecritical spatial variable rate nitrogen application (VRN) method and to overcome the limitations of traditional field sampling methods, this study focused on the relationship between SPAD chlorophyll meter readings and nitrogen content in leaves in order to determine the amount of nitrogen fertilisation required for agricultural objectives. Field experiments were conducted in three wheat growth duration stages from 2003 to 2006. Grain yields and soil N03-N contents were measured in all plots. Our results indicated that VRN technology reduced wheat yield spatial variability. The benefits of VRN included low soil residual NO,-N content and N03-N leaching potential, suggesting that VRN technology based on SPAD readings can potentially reduce groundwater pollution and therefore protect our limited environmental resources.
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