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Study the Spatial-Temporal Variation of Wheat Growth Under Different Site-Specific Nitrogen Fertilization Approaches

文献类型： 会议论文

第一作者： Bei Cui

作者： Bei Cui 1 ; Wenjiang Huang 1 ; Xiaoyu Song 2 ; Huichun Ye 1 ; Yingying Dong 1 ;

作者机构： 1.Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100094, People's Republic of China

2.Beijing Research Center for Information Technology in Agriculture, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, People's Republic of China

关键词： Site-specific N fertilization;Winter wheat;Spatial-temporal variation

会议名称： IFIP WG International Conference on Computer and Computing Technologies in Agricultur

主办单位：

页码： 316-332

摘要： Many variable fertilization approaches based on 'real-time' crop N status were developed for making N fertilizer management in precision agriculture. Unfortunately, to date, only few papers reported the effect of variable fertilization algorithms on the spatial and temporal variability of crop parameters. Based on these problems, this study designed three different variable fertilization algorithms based on vegetation index (Y), SPAD (S) and crop growth model (Z), respectively, with uniform fertilization and no fertilization as controls. Results showed that wheat growth had strong spatial dependence, which become stronger after fertilization. Wheat yield also had strong spatial dependence. There were some similar spatial distribution between NDVIs, soil TN and yield, indicating that spatial variability of yield had strong relationship with crop growth status and soil TN content. The site-specific fertilization treatment based on crop growth model (Z) had the best adjustment capacity to promote crop growth and yield, and reduce their spatial variation, compared with other fertilization treatments.

分类号： s126-532

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