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2018 Vol.51, Issue 4 Preview Page

Short communication

Assessment of Hyperspectral Reflectance on Rice Leaf Inoculated with Bacterial Leaf Blight for Applicability of UAV Monitoring
Kyung­Do Lee1*
,
Sang-Min Kim2
,
Chan-Won Park1
,
Kyu-Ho So1
,
Ho-yong An1
,
Sang­Il Na1
,
,
,
,
,
1National Institute of Agricultural Sciences, RDA, Wanju 56365, Korea
2National Institute of Crop Science, RDA, Wanju 55365, Korea
* Corresponding Author
30 November 2018. pp. 360-368
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Abstract

We analyzed the spectral reflectance characteristics of rice leaves according to the occurrence of bacterial leaf blight and the correlation between vegetation index and disease area ratio in order to evaluate the possibility of using Unmanned Aerial Vehicle (UAV) image for disease investigation. As a result, relationship between the spectral reflectance of inoculated rice leaves and the ratio of disease area showed a high correlation of 0.9 or more in wavelength from 700 nm to 750 nm. Also, the reflectance of the visible light region from 500 nm to 700 nm and the near infrared region in more than 800 nm showed a correlation from 0.8 to 0.9 more. The area ration of rice leaves increase rapidly after 10 days of inoculation. The vegetation index(NDVI, GNDVI and NDRE) that can be calculated by UAV images showed a tendency to decrease remarkably with increase of diseased area ratio. Relationship between the vegetation index and disease area ratio on the 10th day after the inoculation, in which disease area ratio increased rapidly, showed a negative linear correlation from -0.77 to -0.95. Therefore, it is considered that it is possible to analyze the diseased area by UAV image.

Change of spectral reflectance on rice leaves according to days after inoculation of Bacterial Leaf Blight.

Keywords
Hyperspectral reflectance
Bacterial leaf blight
UAV Monitoring

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Information
  • Publisher :Korean Society of Soil Science and Fertilizer
  • Publisher(Ko) :한국토양비료학회
  • Journal Title :Korean Journal of Soil Science and Fertilizer
  • Journal Title(Ko) :한국토양비료학회 학회지
  • Volume : 51
  • No :4
  • Pages :360-368
  • Received Date : 2018-06-08
  • Revised Date : 2018-11-29
  • Accepted Date : 2018-11-29
  • DOI :https://doi.org/10.7745/KJSSF.2018.51.4.360
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