Estimation of nitrogen content of rice [Oryza sativa] plant using remote sensing technology
2004
Ryu, C. (Kyoto Univ. (Japan)) | Suguri, M. | Umeda, M. | Inamura, T.
Abstract In this research, the possibility of wide area remote sensing technology for precision agriculture in rice paddy was investigated. The sub field was applied three different doses at basal dressing and topdressing. Vegetation indices, calculated from the data of sub field, were compared with the amount of nitrogen content by chemical analysis. At panicle initiation stage and heading stage of sub field, the amount of nitrogen content by chemical analysis was compared with the multiplication of vegetation index and LAI or dry weight and the multiplication of vegetation index and vegetation index instead of LAI or dry weight. Same method was investigated at panicle initiation stage of main field. The multiplication of vegetation indices was investigated of the possibility of estimation of nitrogen content, comparing with SPAD value, vegetation growth index, LAI and the amount of nitrogen content by chemical analysis. It is possible to estimate the nitrogen content of panicle initiation and heading stage at sub field with the multiplication of vegetation indices. It is, however, difficult to estimate the nitrogen content of main field using the multiplication of vegetation indices at main field.
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